adamc@412: (* Copyright (c) 2008, Adam Chlipala
adamc@445:  * All rights reserved.
adamc@445:  *
adamc@445:  * Redistribution and use in source and binary forms, with or without
adamc@445:  * modification, are permitted provided that the following conditions are met:
adamc@445:  *
adamc@445:  * - Redistributions of source code must retain the above copyright notice,
adamc@445:  *   this list of conditions and the following disclaimer.
adamc@445:  * - Redistributions in binary form must reproduce the above copyright notice,
adamc@445:  *   this list of conditions and the following disclaimer in the documentation
adamc@445:  *   and/or other materials provided with the distribution.
adamc@445:  * - The names of contributors may not be used to endorse or promote products
adamc@445:  *   derived from this software without specific prior written permission.
adamc@445:  *
adamc@445:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@445:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@445:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@445:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@445:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
adamc@445:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@445:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@445:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@445:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@445:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@445:  * POSSIBILITY OF SUCH DAMAGE.
adamc@445:  *)
adamc@403: 
adamc@403:  structure Elaborate :> ELABORATE = struct
adamc@403: 
adamc@403:  structure P = Prim
adamc@403:  structure L = Source
adamc@403:  structure L' = Elab
adamc@403:  structure E = ElabEnv
adamc@403:  structure U = ElabUtil
adamc@403:  structure D = Disjoint
adamc@403: 
adamc@403:  open Print
adamc@403:  open ElabPrint
adamc@403:  open ElabErr
adamc@403: 
adamc@403:  structure IM = IntBinaryMap
adamc@403: 
adamc@403:  structure SK = struct
adamc@403:  type ord_key = string
adamc@403:  val compare = String.compare
adamc@403:  end
adamc@403: 
adamc@403:  structure SS = BinarySetFn(SK)
adamc@403:  structure SM = BinaryMapFn(SK)
adamc@403: 
adamc@403:  val basis_r = ref 0
adamc@403: 
adamc@403:  fun elabExplicitness e =
adamc@403:      case e of
adamc@403:          L.Explicit => L'.Explicit
adamc@403:        | L.Implicit => L'.Implicit
adamc@403: 
adamc@403:  fun occursKind r =
adamc@403:      U.Kind.exists (fn L'.KUnif (_, _, r') => r = r'
adamc@403:                      | _ => false)
adamc@403: 
adamc@403:  exception KUnify' of kunify_error
adamc@403: 
adamc@403:  fun unifyKinds' (k1All as (k1, _)) (k2All as (k2, _)) =
adamc@403:      let
adamc@403:          fun err f = raise KUnify' (f (k1All, k2All))
adamc@403:      in
adamc@403:          case (k1, k2) of
adamc@403:              (L'.KType, L'.KType) => ()
adamc@403:            | (L'.KUnit, L'.KUnit) => ()
adamc@403: 
adamc@403:            | (L'.KArrow (d1, r1), L'.KArrow (d2, r2)) =>
adamc@403:              (unifyKinds' d1 d2;
adamc@403:               unifyKinds' r1 r2)
adamc@403:            | (L'.KName, L'.KName) => ()
adamc@403:            | (L'.KRecord k1, L'.KRecord k2) => unifyKinds' k1 k2
adamc@403:            | (L'.KTuple ks1, L'.KTuple ks2) =>
adamc@403:              ((ListPair.appEq (fn (k1, k2) => unifyKinds' k1 k2) (ks1, ks2))
adamc@403:               handle ListPair.UnequalLengths => err KIncompatible)
adamc@403: 
adamc@403:            | (L'.KError, _) => ()
adamc@403:            | (_, L'.KError) => ()
adamc@403: 
adamc@403:            | (L'.KUnif (_, _, ref (SOME k1All)), _) => unifyKinds' k1All k2All
adamc@403:            | (_, L'.KUnif (_, _, ref (SOME k2All))) => unifyKinds' k1All k2All
adamc@403: 
adamc@403:            | (L'.KUnif (_, _, r1), L'.KUnif (_, _, r2)) =>
adamc@403:              if r1 = r2 then
adamc@403:                  ()
adamc@403:              else
adamc@403:                  r1 := SOME k2All
adamc@403: 
adamc@403:            | (L'.KUnif (_, _, r), _) =>
adamc@403:              if occursKind r k2All then
adamc@403:                  err KOccursCheckFailed
adamc@403:              else
adamc@403:                  r := SOME k2All
adamc@403:            | (_, L'.KUnif (_, _, r)) =>
adamc@403:              if occursKind r k1All then
adamc@403:                  err KOccursCheckFailed
adamc@403:              else
adamc@403:                  r := SOME k1All
adamc@403: 
adamc@403:            | _ => err KIncompatible
adamc@403:      end
adamc@403: 
adamc@403:  exception KUnify of L'.kind * L'.kind * kunify_error
adamc@403: 
adamc@403:  fun unifyKinds k1 k2 =
adamc@403:      unifyKinds' k1 k2
adamc@403:      handle KUnify' err => raise KUnify (k1, k2, err)
adamc@403: 
adamc@403:  fun checkKind env c k1 k2 =
adamc@403:      unifyKinds k1 k2
adamc@403:      handle KUnify (k1, k2, err) =>
adamc@403:             conError env (WrongKind (c, k1, k2, err))
adamc@403: 
adamc@403:  val dummy = ErrorMsg.dummySpan
adamc@403: 
adamc@403:  val ktype = (L'.KType, dummy)
adamc@403:  val kname = (L'.KName, dummy)
adamc@403:  val ktype_record = (L'.KRecord ktype, dummy)
adamc@403: 
adamc@403:  val cerror = (L'.CError, dummy)
adamc@403:  val kerror = (L'.KError, dummy)
adamc@403:  val eerror = (L'.EError, dummy)
adamc@403:  val sgnerror = (L'.SgnError, dummy)
adamc@403:  val strerror = (L'.StrError, dummy)
adamc@403: 
adamc@403:  val int = ref cerror
adamc@403:  val float = ref cerror
adamc@403:  val string = ref cerror
adamc@403:  val table = ref cerror
adamc@403: 
adamc@403:  local
adamc@403:      val count = ref 0
adamc@403:  in
adamc@403: 
adamc@403:  fun resetKunif () = count := 0
adamc@403: 
adamc@403:  fun kunif loc =
adamc@403:      let
adamc@403:          val n = !count
adamc@403:          val s = if n <= 26 then
adamc@403:                      str (chr (ord #"A" + n))
adamc@403:                  else
adamc@403:                      "U" ^ Int.toString (n - 26)
adamc@403:      in
adamc@403:          count := n + 1;
adamc@403:          (L'.KUnif (loc, s, ref NONE), dummy)
adamc@403:      end
adamc@403: 
adamc@403:  end
adamc@403: 
adamc@403:  local
adamc@403:      val count = ref 0
adamc@403:  in
adamc@403: 
adamc@403:  fun resetCunif () = count := 0
adamc@403: 
adamc@403:  fun cunif (loc, k) =
adamc@403:      let
adamc@403:          val n = !count
adamc@403:          val s = if n <= 26 then
adamc@403:                      str (chr (ord #"A" + n))
adamc@403:                  else
adamc@403:                      "U" ^ Int.toString (n - 26)
adamc@403:      in
adamc@403:          count := n + 1;
adamc@403:          (L'.CUnif (loc, k, s, ref NONE), dummy)
adamc@403:      end
adamc@403: 
adamc@403:  end
adamc@403: 
adamc@403:  fun elabKind (k, loc) =
adamc@403:      case k of
adamc@403:          L.KType => (L'.KType, loc)
adamc@403:        | L.KArrow (k1, k2) => (L'.KArrow (elabKind k1, elabKind k2), loc)
adamc@403:        | L.KName => (L'.KName, loc)
adamc@403:        | L.KRecord k => (L'.KRecord (elabKind k), loc)
adamc@403:        | L.KUnit => (L'.KUnit, loc)
adamc@403:        | L.KTuple ks => (L'.KTuple (map elabKind ks), loc)
adamc@403:        | L.KWild => kunif loc
adamc@403: 
adamc@403:  fun foldKind (dom, ran, loc)=
adamc@403:      (L'.KArrow ((L'.KArrow ((L'.KName, loc),
adamc@403:                              (L'.KArrow (dom,
adamc@403:                                          (L'.KArrow (ran, ran), loc)), loc)), loc),
adamc@403:                  (L'.KArrow (ran,
adamc@403:                              (L'.KArrow ((L'.KRecord dom, loc),
adamc@403:                                          ran), loc)), loc)), loc)
adamc@403: 
adamc@403:  fun hnormKind (kAll as (k, _)) =
adamc@403:      case k of
adamc@403:          L'.KUnif (_, _, ref (SOME k)) => hnormKind k
adamc@403:        | _ => kAll
adamc@403: 
adamc@403:  fun elabCon (env, denv) (c, loc) =
adamc@403:      case c of
adamc@403:          L.CAnnot (c, k) =>
adamc@403:          let
adamc@403:              val k' = elabKind k
adamc@403:              val (c', ck, gs) = elabCon (env, denv) c
adamc@403:          in
adamc@403:              checkKind env c' ck k';
adamc@403:              (c', k', gs)
adamc@403:          end
adamc@403: 
adamc@403:        | L.TFun (t1, t2) =>
adamc@403:          let
adamc@403:              val (t1', k1, gs1) = elabCon (env, denv) t1
adamc@403:              val (t2', k2, gs2) = elabCon (env, denv) t2
adamc@403:          in
adamc@403:              checkKind env t1' k1 ktype;
adamc@403:              checkKind env t2' k2 ktype;
adamc@403:              ((L'.TFun (t1', t2'), loc), ktype, gs1 @ gs2)
adamc@403:          end
adamc@403:        | L.TCFun (e, x, k, t) =>
adamc@403:          let
adamc@403:              val e' = elabExplicitness e
adamc@403:              val k' = elabKind k
adamc@403:              val env' = E.pushCRel env x k'
adamc@403:              val (t', tk, gs) = elabCon (env', D.enter denv) t
adamc@403:          in
adamc@403:              checkKind env t' tk ktype;
adamc@403:              ((L'.TCFun (e', x, k', t'), loc), ktype, gs)
adamc@403:          end
adamc@403:        | L.CDisjoint (c1, c2, c) =>
adamc@403:          let
adamc@403:              val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@403:              val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@403: 
adamc@403:              val ku1 = kunif loc
adamc@403:              val ku2 = kunif loc
adamc@403: 
adamc@403:              val (denv', gs3) = D.assert env denv (c1', c2')
adamc@403:              val (c', k, gs4) = elabCon (env, denv') c
adamc@403:          in
adamc@403:              checkKind env c1' k1 (L'.KRecord ku1, loc);
adamc@403:              checkKind env c2' k2 (L'.KRecord ku2, loc);
adamc@403: 
adamc@403:              ((L'.CDisjoint (L'.Instantiate, c1', c2', c'), loc), k, gs1 @ gs2 @ gs3 @ gs4)
adamc@403:          end
adamc@403:        | L.TRecord c =>
adamc@403:          let
adamc@403:              val (c', ck, gs) = elabCon (env, denv) c
adamc@403:              val k = (L'.KRecord ktype, loc)
adamc@403:          in
adamc@403:              checkKind env c' ck k;
adamc@403:              ((L'.TRecord c', loc), ktype, gs)
adamc@403:          end
adamc@403: 
adamc@403:        | L.CVar ([], s) =>
adamc@403:          (case E.lookupC env s of
adamc@403:               E.NotBound =>
adamc@403:               (conError env (UnboundCon (loc, s));
adamc@403:                (cerror, kerror, []))
adamc@403:             | E.Rel (n, k) =>
adamc@403:               ((L'.CRel n, loc), k, [])
adamc@403:             | E.Named (n, k) =>
adamc@403:               ((L'.CNamed n, loc), k, []))
adamc@403:        | L.CVar (m1 :: ms, s) =>
adamc@403:          (case E.lookupStr env m1 of
adamc@403:               NONE => (conError env (UnboundStrInCon (loc, m1));
adamc@403:                        (cerror, kerror, []))
adamc@403:             | SOME (n, sgn) =>
adamc@403:               let
adamc@403:                   val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@403:                                       case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@403:                                           NONE => (conError env (UnboundStrInCon (loc, m));
adamc@403:                                                    (strerror, sgnerror))
adamc@403:                                         | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@403:                                    ((L'.StrVar n, loc), sgn) ms
adamc@403: 
adamc@403:                   val k = case E.projectCon env {sgn = sgn, str = str, field = s} of
adamc@403:                               NONE => (conError env (UnboundCon (loc, s));
adamc@403:                                        kerror)
adamc@403:                             | SOME (k, _) => k
adamc@403:               in
adamc@403:                   ((L'.CModProj (n, ms, s), loc), k, [])
adamc@403:               end)
adamc@403: 
adamc@403:        | L.CApp (c1, c2) =>
adamc@403:          let
adamc@403:              val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@403:              val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@403:              val dom = kunif loc
adamc@403:              val ran = kunif loc
adamc@403:          in
adamc@403:              checkKind env c1' k1 (L'.KArrow (dom, ran), loc);
adamc@403:              checkKind env c2' k2 dom;
adamc@403:              ((L'.CApp (c1', c2'), loc), ran, gs1 @ gs2)
adamc@403:          end
adamc@403:        | L.CAbs (x, ko, t) =>
adamc@403:          let
adamc@403:              val k' = case ko of
adamc@403:                           NONE => kunif loc
adamc@403:                         | SOME k => elabKind k
adamc@403:              val env' = E.pushCRel env x k'
adamc@403:              val (t', tk, gs) = elabCon (env', D.enter denv) t
adamc@403:          in
adamc@403:              ((L'.CAbs (x, k', t'), loc),
adamc@403:               (L'.KArrow (k', tk), loc),
adamc@403:               gs)
adamc@403:          end
adamc@403: 
adamc@403:        | L.CName s =>
adamc@403:          ((L'.CName s, loc), kname, [])
adamc@403: 
adamc@403:        | L.CRecord xcs =>
adamc@403:          let
adamc@403:              val k = kunif loc
adamc@403: 
adamc@403:              val (xcs', gs) = ListUtil.foldlMap (fn ((x, c), gs) =>
adamc@403:                                                     let
adamc@403:                                                         val (x', xk, gs1) = elabCon (env, denv) x
adamc@403:                                                         val (c', ck, gs2) = elabCon (env, denv) c
adamc@403:                                                     in
adamc@403:                                                         checkKind env x' xk kname;
adamc@403:                                                         checkKind env c' ck k;
adamc@403:                                                         ((x', c'), gs1 @ gs2 @ gs)
adamc@403:                                                     end) [] xcs
adamc@403: 
adamc@403:              val rc = (L'.CRecord (k, xcs'), loc)
adamc@403:              (* Add duplicate field checking later. *)
adamc@403: 
adamc@403:              fun prove (xcs, ds) =
adamc@403:                  case xcs of
adamc@403:                      [] => ds
adamc@403:                    | xc :: rest =>
adamc@403:                      let
adamc@403:                          val r1 = (L'.CRecord (k, [xc]), loc)
adamc@403:                          val ds = foldl (fn (xc', ds) =>
adamc@403:                                             let
adamc@403:                                                 val r2 = (L'.CRecord (k, [xc']), loc)
adamc@403:                                             in
adamc@403:                                                 D.prove env denv (r1, r2, loc) @ ds
adamc@403:                                             end)
adamc@403:                                   ds rest
adamc@403:                      in
adamc@403:                          prove (rest, ds)
adamc@403:                      end
adamc@403:          in
adamc@403:              (rc, (L'.KRecord k, loc), prove (xcs', gs))
adamc@403:          end
adamc@403:        | L.CConcat (c1, c2) =>
adamc@403:          let
adamc@403:              val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@403:              val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@403:              val ku = kunif loc
adamc@403:              val k = (L'.KRecord ku, loc)
adamc@403:          in
adamc@403:              checkKind env c1' k1 k;
adamc@403:              checkKind env c2' k2 k;
adamc@403:              ((L'.CConcat (c1', c2'), loc), k,
adamc@403:               D.prove env denv (c1', c2', loc) @ gs1 @ gs2)
adamc@403:          end
adamc@403:        | L.CFold =>
adamc@403:          let
adamc@403:              val dom = kunif loc
adamc@403:              val ran = kunif loc
adamc@403:          in
adamc@403:              ((L'.CFold (dom, ran), loc),
adamc@403:               foldKind (dom, ran, loc),
adamc@403:               [])
adamc@403:          end
adamc@403: 
adamc@403:        | L.CUnit => ((L'.CUnit, loc), (L'.KUnit, loc), [])
adamc@403: 
adamc@403:        | L.CTuple cs =>
adamc@403:          let
adamc@403:              val (cs', ks, gs) = foldl (fn (c, (cs', ks, gs)) =>
adamc@403:                                            let
adamc@403:                                                val (c', k, gs') = elabCon (env, denv) c
adamc@403:                                            in
adamc@403:                                                (c' :: cs', k :: ks, gs' @ gs)
adamc@403:                                            end) ([], [], []) cs
adamc@403:          in
adamc@403:              ((L'.CTuple (rev cs'), loc), (L'.KTuple (rev ks), loc), gs)
adamc@403:          end
adamc@403:        | L.CProj (c, n) =>
adamc@403:          let
adamc@403:              val (c', k, gs) = elabCon (env, denv) c
adamc@403:          in
adamc@403:              case hnormKind k of
adamc@403:                  (L'.KTuple ks, _) =>
adamc@403:                  if n <= 0 orelse n > length ks then
adamc@403:                      (conError env (ProjBounds (c', n));
adamc@83:                       (cerror, kerror, []))
adamc@403:                  else
adamc@403:                      ((L'.CProj (c', n), loc), List.nth (ks, n - 1), gs)
adamc@403:                | k => (conError env (ProjMismatch (c', k));
adamc@403:                        (cerror, kerror, []))
adamc@403:          end
adamc@403: 
adamc@403:        | L.CWild k =>
adamc@403:          let
adamc@403:              val k' = elabKind k
adamc@403:          in
adamc@403:              (cunif (loc, k'), k', [])
adamc@403:          end
adamc@403: 
adamc@403:  fun kunifsRemain k =
adamc@403:      case k of
adamc@403:          L'.KUnif (_, _, ref NONE) => true
adamc@403:        | _ => false
adamc@403:  fun cunifsRemain c =
adamc@403:      case c of
adamc@403:          L'.CUnif (loc, _, _, ref NONE) => SOME loc
adamc@403:        | _ => NONE
adamc@403: 
adamc@403:  val kunifsInDecl = U.Decl.exists {kind = kunifsRemain,
adamc@403:                                    con = fn _ => false,
adamc@403:                                    exp = fn _ => false,
adamc@403:                                    sgn_item = fn _ => false,
adamc@403:                                    sgn = fn _ => false,
adamc@403:                                    str = fn _ => false,
adamc@403:                                    decl = fn _ => false}
adamc@403: 
adamc@403:  val cunifsInDecl = U.Decl.search {kind = fn _ => NONE,
adamc@403:                                    con = cunifsRemain,
adamc@403:                                    exp = fn _ => NONE,
adamc@403:                                    sgn_item = fn _ => NONE,
adamc@403:                                    sgn = fn _ => NONE,
adamc@403:                                    str = fn _ => NONE,
adamc@403:                                    decl = fn _ => NONE}
adamc@403: 
adamc@403:  fun occursCon r =
adamc@403:      U.Con.exists {kind = fn _ => false,
adamc@403:                    con = fn L'.CUnif (_, _, _, r') => r = r'
adamc@403:                           | _ => false}
adamc@403: 
adamc@403:  exception CUnify' of cunify_error
adamc@403: 
adamc@403:  exception SynUnif = E.SynUnif
adamc@403: 
adamc@403:  open ElabOps
adamc@403: 
adamc@403:  type record_summary = {
adamc@403:       fields : (L'.con * L'.con) list,
adamc@403:       unifs : (L'.con * L'.con option ref) list,
adamc@403:       others : L'.con list
adamc@403:  }
adamc@403: 
adamc@403:  fun summaryToCon {fields, unifs, others} =
adamc@403:      let
adamc@403:          val c = (L'.CRecord (ktype, []), dummy)
adamc@403:          val c = List.foldr (fn (c', c) => (L'.CConcat (c', c), dummy)) c others
adamc@403:          val c = List.foldr (fn ((c', _), c) => (L'.CConcat (c', c), dummy)) c unifs
adamc@403:      in
adamc@403:          (L'.CConcat ((L'.CRecord (ktype, fields), dummy), c), dummy)
adamc@403:      end
adamc@403: 
adamc@403:  fun p_summary env s = p_con env (summaryToCon s)
adamc@403: 
adamc@403:  exception CUnify of L'.con * L'.con * cunify_error
adamc@403: 
adamc@403:  fun kindof env (c, loc) =
adamc@403:      case c of
adamc@403:          L'.TFun _ => ktype
adamc@403:        | L'.TCFun _ => ktype
adamc@403:        | L'.TRecord _ => ktype
adamc@403: 
adamc@403:        | L'.CRel xn => #2 (E.lookupCRel env xn)
adamc@403:        | L'.CNamed xn => #2 (E.lookupCNamed env xn)
adamc@403:        | L'.CModProj (n, ms, x) =>
adamc@403:          let
adamc@403:              val (_, sgn) = E.lookupStrNamed env n
adamc@403:              val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@403:                                         case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@403:                                             NONE => raise Fail "kindof: Unknown substructure"
adamc@403:                                           | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@403:                               ((L'.StrVar n, loc), sgn) ms
adamc@403:          in
adamc@403:              case E.projectCon env {sgn = sgn, str = str, field = x} of
adamc@403:                  NONE => raise Fail "kindof: Unknown con in structure"
adamc@403:                | SOME (k, _) => k
adamc@403:          end
adamc@403: 
adamc@403:        | L'.CApp (c, _) =>
adamc@403:          (case hnormKind (kindof env c) of
adamc@403:               (L'.KArrow (_, k), _) => k
adamc@403:             | (L'.KError, _) => kerror
adamc@413:             | k => raise CUnify' (CKindof (k, c, "arrow")))
adamc@403:        | L'.CAbs (x, k, c) => (L'.KArrow (k, kindof (E.pushCRel env x k) c), loc)
adamc@403:        | L'.CDisjoint (_, _, _, c) => kindof env c
adamc@403: 
adamc@403:        | L'.CName _ => kname
adamc@403: 
adamc@403:        | L'.CRecord (k, _) => (L'.KRecord k, loc)
adamc@403:        | L'.CConcat (c, _) => kindof env c
adamc@403:        | L'.CFold (dom, ran) => foldKind (dom, ran, loc)
adamc@403: 
adamc@403:        | L'.CUnit => (L'.KUnit, loc)
adamc@403: 
adamc@403:        | L'.CTuple cs => (L'.KTuple (map (kindof env) cs), loc)
adamc@403:        | L'.CProj (c, n) =>
adamc@403:          (case hnormKind (kindof env c) of
adamc@403:               (L'.KTuple ks, _) => List.nth (ks, n - 1)
adamc@413:             | k => raise CUnify' (CKindof (k, c, "tuple")))
adamc@403: 
adamc@403:        | L'.CError => kerror
adamc@403:        | L'.CUnif (_, k, _, _) => k
adamc@403: 
adamc@403:  val hnormCon = D.hnormCon
adamc@403: 
adamc@403:  datatype con_summary =
adamc@403:           Nil
adamc@403:         | Cons
adamc@403:         | Unknown
adamc@403: 
adamc@403:  fun compatible cs =
adamc@403:      case cs of
adamc@403:          (Unknown, _) => false
adamc@403:        | (_, Unknown) => false
adamc@403:        | (s1, s2) => s1 = s2
adamc@403: 
adamc@403:  fun summarizeCon (env, denv) c =
adamc@403:      let
adamc@403:          val (c, gs) = hnormCon (env, denv) c
adamc@403:      in
adamc@403:          case #1 c of
adamc@403:              L'.CRecord (_, []) => (Nil, gs)
adamc@403:            | L'.CRecord (_, _ :: _) => (Cons, gs)
adamc@403:            | L'.CConcat ((L'.CRecord (_, _ :: _), _), _) => (Cons, gs)
adamc@403:            | L'.CDisjoint (_, _, _, c) =>
adamc@34:              let
adamc@403:                  val (s, gs') = summarizeCon (env, denv) c
adamc@34:              in
adamc@403:                  (s, gs @ gs')
adamc@403:              end
adamc@403:            | _ => (Unknown, gs)
adamc@403:      end
adamc@403: 
adamc@403:  fun p_con_summary s =
adamc@403:      Print.PD.string (case s of
adamc@403:                           Nil => "Nil"
adamc@403:                         | Cons => "Cons"
adamc@403:                         | Unknown => "Unknown")
adamc@403: 
adamc@403:  exception SummaryFailure
adamc@403: 
adamc@403:  fun unifyRecordCons (env, denv) (c1, c2) =
adamc@403:      let
adamc@403:          fun rkindof c =
adamc@403:              case hnormKind (kindof env c) of
adamc@403:                  (L'.KRecord k, _) => k
adamc@403:                | (L'.KError, _) => kerror
adamc@413:                | k => raise CUnify' (CKindof (k, c, "record"))
adamc@403: 
adamc@403:          val k1 = rkindof c1
adamc@403:          val k2 = rkindof c2
adamc@403: 
adamc@403:          val (r1, gs1) = recordSummary (env, denv) c1
adamc@403:          val (r2, gs2) = recordSummary (env, denv) c2
adamc@403:      in
adamc@403:          unifyKinds k1 k2;
adamc@403:          unifySummaries (env, denv) (k1, r1, r2);
adamc@403:          gs1 @ gs2
adamc@403:      end
adamc@403: 
adamc@403:  and recordSummary (env, denv) c =
adamc@403:      let
adamc@403:          val (c, gs) = hnormCon (env, denv) c
adamc@403: 
adamc@403:          val (sum, gs') =
adamc@403:              case c of
adamc@403:                  (L'.CRecord (_, xcs), _) => ({fields = xcs, unifs = [], others = []}, [])
adamc@403:                | (L'.CConcat (c1, c2), _) =>
adamc@403:                  let
adamc@403:                      val (s1, gs1) = recordSummary (env, denv) c1
adamc@403:                      val (s2, gs2) = recordSummary (env, denv) c2
adamc@403:                  in
adamc@403:                      ({fields = #fields s1 @ #fields s2,
adamc@403:                        unifs = #unifs s1 @ #unifs s2,
adamc@403:                        others = #others s1 @ #others s2},
adamc@403:                       gs1 @ gs2)
adamc@403:                  end
adamc@403:                | (L'.CUnif (_, _, _, ref (SOME c)), _) => recordSummary (env, denv) c
adamc@403:                | c' as (L'.CUnif (_, _, _, r), _) => ({fields = [], unifs = [(c', r)], others = []}, [])
adamc@403:                | c' => ({fields = [], unifs = [], others = [c']}, [])
adamc@403:      in
adamc@403:          (sum, gs @ gs')
adamc@403:      end
adamc@403: 
adamc@403:  and consEq (env, denv) (c1, c2) =
adamc@403:      let
adamc@403:          val gs = unifyCons (env, denv) c1 c2
adamc@403:      in
adamc@403:          List.all (fn (loc, env, denv, c1, c2) =>
adamc@403:                       case D.prove env denv (c1, c2, loc) of
adamc@403:                           [] => true
adamc@403:                         | _ => false) gs
adamc@403:      end
adamc@403:      handle CUnify _ => false
adamc@403: 
adamc@403:  and consNeq env (c1, c2) =
adamc@403:      case (#1 (ElabOps.hnormCon env c1), #1 (ElabOps.hnormCon env c2)) of
adamc@403:          (L'.CName x1, L'.CName x2) => x1 <> x2
adamc@403:        | _ => false
adamc@403: 
adamc@403:  and unifySummaries (env, denv) (k, s1 : record_summary, s2 : record_summary) =
adamc@403:      let
adamc@403:          val loc = #2 k
adamc@403:          (*val () = eprefaces "Summaries" [("#1", p_summary env s1),
adamc@403:                                          ("#2", p_summary env s2)]*)
adamc@403: 
adamc@403:          fun eatMatching p (ls1, ls2) =
adamc@403:              let
adamc@403:                  fun em (ls1, ls2, passed1) =
adamc@403:                      case ls1 of
adamc@403:                          [] => (rev passed1, ls2)
adamc@403:                        | h1 :: t1 =>
adamc@403:                          let
adamc@403:                              fun search (ls2', passed2) =
adamc@403:                                  case ls2' of
adamc@403:                                      [] => em (t1, ls2, h1 :: passed1)
adamc@403:                                    | h2 :: t2 =>
adamc@403:                                      if p (h1, h2) then
adamc@403:                                          em (t1, List.revAppend (passed2, t2), passed1)
adamc@403:                                      else
adamc@403:                                          search (t2, h2 :: passed2)
adamc@403:                          in
adamc@403:                              search (ls2, [])
adamc@403:                          end
adamc@403:              in
adamc@403:                  em (ls1, ls2, [])
adamc@403:              end
adamc@403: 
adamc@403:          val (fs1, fs2) = eatMatching (fn ((x1, c1), (x2, c2)) =>
adamc@403:                                           not (consNeq env (x1, x2))
adamc@403:                                           andalso consEq (env, denv) (c1, c2)
adamc@403:                                           andalso consEq (env, denv) (x1, x2))
adamc@403:                                       (#fields s1, #fields s2)
adamc@403:          (*val () = eprefaces "Summaries2" [("#1", p_summary env {fields = fs1, unifs = #unifs s1, others = #others s1}),
adamc@403:                                           ("#2", p_summary env {fields = fs2, unifs = #unifs s2, others = #others s2})]*)
adamc@403:          val (unifs1, unifs2) = eatMatching (fn ((_, r1), (_, r2)) => r1 = r2) (#unifs s1, #unifs s2)
adamc@403:          val (others1, others2) = eatMatching (consEq (env, denv)) (#others s1, #others s2)
adamc@403:          (*val () = eprefaces "Summaries3" [("#1", p_summary env {fields = fs1, unifs = unifs1, others = others1}),
adamc@403:                                           ("#2", p_summary env {fields = fs2, unifs = unifs2, others = others2})]*)
adamc@403: 
adamc@403:          fun unifFields (fs, others, unifs) =
adamc@403:              case (fs, others, unifs) of
adamc@403:                  ([], [], _) => ([], [], unifs)
adamc@403:                | (_, _, []) => (fs, others, [])
adamc@403:                | (_, _, (_, r) :: rest) =>
adamc@403:                  let
adamc@403:                      val r' = ref NONE
adamc@403:                      val kr = (L'.KRecord k, dummy)
adamc@403:                      val cr' = (L'.CUnif (dummy, kr, "recd", r'), dummy)
adamc@403: 
adamc@403:                      val prefix = case (fs, others) of
adamc@403:                                       ([], other :: others) =>
adamc@403:                                       List.foldl (fn (other, c) =>
adamc@403:                                                      (L'.CConcat (c, other), dummy))
adamc@403:                                                  other others
adamc@403:                                     | (fs, []) =>
adamc@403:                                       (L'.CRecord (k, fs), dummy)
adamc@403:                                     | (fs, others) =>
adamc@403:                                       List.foldl (fn (other, c) =>
adamc@403:                                                      (L'.CConcat (c, other), dummy))
adamc@403:                                                  (L'.CRecord (k, fs), dummy) others
adamc@403:                  in
adamc@403:                      r := SOME (L'.CConcat (prefix, cr'), dummy);
adamc@403:                      ([], [], (cr', r') :: rest)
adamc@403:                  end
adamc@403: 
adamc@403:          val (fs1, others1, unifs2) = unifFields (fs1, others1, unifs2)
adamc@403:          val (fs2, others2, unifs1) = unifFields (fs2, others2, unifs1)
adamc@403: 
adamc@403:          (*val () = eprefaces "Summaries4" [("#1", p_summary env {fields = fs1, unifs = unifs1, others = others1}),
adamc@403:                                           ("#2", p_summary env {fields = fs2, unifs = unifs2, others = others2})]*)
adamc@403: 
adamc@403:          fun isGuessable (other, fs) =
adamc@403:              let
adamc@403:                  val gs = guessFold (env, denv) (other, (L'.CRecord (k, fs), loc), [], SummaryFailure)
adamc@403:              in
adamc@403:                  List.all (fn (loc, env, denv, c1, c2) =>
adamc@403:                               case D.prove env denv (c1, c2, loc) of
adamc@403:                                   [] => true
adamc@403:                                 | _ => false) gs
adamc@403:              end
adamc@403:              handle SummaryFailure => false
adamc@403: 
adamc@403:          val (fs1, fs2, others1, others2) =
adamc@403:              case (fs1, fs2, others1, others2) of
adamc@403:                  ([], _, [other1], []) =>
adamc@403:                  if isGuessable (other1, fs2) then
adamc@403:                      ([], [], [], [])
adamc@403:                  else
adamc@403:                      (fs1, fs2, others1, others2)
adamc@403:                | (_, [], [], [other2]) =>
adamc@403:                  if isGuessable (other2, fs1) then
adamc@403:                      ([], [], [], [])
adamc@403:                  else
adamc@403:                      (fs1, fs2, others1, others2)
adamc@403:                | _ => (fs1, fs2, others1, others2)
adamc@403: 
adamc@403:          (*val () = eprefaces "Summaries5" [("#1", p_summary env {fields = fs1, unifs = unifs1, others = others1}),
adamc@403:                                             ("#2", p_summary env {fields = fs2, unifs = unifs2, others = others2})]*)
adamc@403: 
adamc@403:          val clear = case (fs1, others1, fs2, others2) of
adamc@403:                           ([], [], [], []) => true
adamc@403:                         | _ => false
adamc@403:          val empty = (L'.CRecord (k, []), dummy)
adamc@403: 
adamc@403:          fun unsummarize {fields, unifs, others} =
adamc@403:              let
adamc@403:                  val c = (L'.CRecord (k, fields), loc)
adamc@403: 
adamc@403:                  val c = foldl (fn ((c1, _), c2) => (L'.CConcat (c1, c2), loc))
adamc@403:                                c unifs
adamc@403:              in
adamc@403:                  foldl (fn (c1, c2) => (L'.CConcat (c1, c2), loc))
adamc@403:                        c others
adamc@403:              end
adamc@403: 
adamc@403:          fun pairOffUnifs (unifs1, unifs2) =
adamc@403:              case (unifs1, unifs2) of
adamc@403:                  ([], _) =>
adamc@403:                  if clear then
adamc@403:                      List.app (fn (_, r) => r := SOME empty) unifs2
adamc@403:                  else
adamc@403:                      raise CUnify' (CRecordFailure (unsummarize s1, unsummarize s2))
adamc@403:                | (_, []) =>
adamc@403:                  if clear then
adamc@403:                      List.app (fn (_, r) => r := SOME empty) unifs1
adamc@403:                  else
adamc@403:                      raise CUnify' (CRecordFailure (unsummarize s1, unsummarize s2))
adamc@403:                | ((c1, _) :: rest1, (_, r2) :: rest2) =>
adamc@403:                  (r2 := SOME c1;
adamc@403:                   pairOffUnifs (rest1, rest2))
adamc@403:      in
adamc@403:          pairOffUnifs (unifs1, unifs2)
adamc@403:          (*before eprefaces "Summaries'" [("#1", p_summary env s1),
adamc@403:                                        ("#2", p_summary env s2)]*)
adamc@403:      end
adamc@403: 
adamc@403:  and guessFold (env, denv) (c1, c2, gs, ex) =
adamc@403:      let
adamc@403:          val loc = #2 c1
adamc@403: 
adamc@403:          fun unfold (dom, ran, f, i, r, c) =
adamc@403:              let
adamc@403:                  val nm = cunif (loc, (L'.KName, loc))
adamc@412:                  val v =
adamc@412:                      case dom of
adamc@412:                          (L'.KUnit, _) => (L'.CUnit, loc)
adamc@412:                        | _ => cunif (loc, dom)
adamc@403:                  val rest = cunif (loc, (L'.KRecord dom, loc))
adamc@403:                  val acc = (L'.CFold (dom, ran), loc)
adamc@403:                  val acc = (L'.CApp (acc, f), loc)
adamc@403:                  val acc = (L'.CApp (acc, i), loc)
adamc@403:                  val acc = (L'.CApp (acc, rest), loc)
adamc@403: 
adamc@403:                  val (iS, gs3) = summarizeCon (env, denv) i
adamc@403: 
adamc@403:                  val app = (L'.CApp (f, nm), loc)
adamc@403:                  val app = (L'.CApp (app, v), loc)
adamc@403:                  val app = (L'.CApp (app, acc), loc)
adamc@403:                  val (appS, gs4) = summarizeCon (env, denv) app
adamc@403: 
adamc@403:                  val (cS, gs5) = summarizeCon (env, denv) c
adamc@403:              in
adamc@403:                  (*prefaces "Summaries" [("iS", p_con_summary iS),
adamc@403:                                          ("appS", p_con_summary appS),
adamc@403:                                          ("cS", p_con_summary cS)];*)
adamc@403: 
adamc@403:                  if compatible (iS, appS) then
adamc@403:                      raise ex
adamc@403:                  else if compatible (cS, iS) then
adamc@403:                      let
adamc@403:                          (*val () = prefaces "Same?" [("i", p_con env i),
adamc@403:                                                     ("c", p_con env c)]*)
adamc@403:                          val gs6 = unifyCons (env, denv) i c
adamc@403:                          (*val () = TextIO.print "Yes!\n"*)
adamc@403: 
adamc@403:                          val gs7 = unifyCons (env, denv) r (L'.CRecord (dom, []), loc)
adamc@403:                      in
adamc@403:                          gs @ gs3 @ gs5 @ gs6 @ gs7
adamc@403:                      end
adamc@403:                  else if compatible (cS, appS) then
adamc@403:                      let
adamc@403:                          (*val () = prefaces "Same?" [("app", p_con env app),
adamc@403:                                                       ("c", p_con env c),
adamc@403:                                                       ("app'", p_con env (#1 (hnormCon (env, denv) app)))]*)
adamc@403:                          val gs6 = unifyCons (env, denv) app c
adamc@403:                          (*val () = TextIO.print "Yes!\n"*)
adamc@403: 
adamc@403:                          val singleton = (L'.CRecord (dom, [(nm, v)]), loc)
adamc@403:                          val concat = (L'.CConcat (singleton, rest), loc)
adamc@403:                          (*val () = prefaces "Pre-crew" [("r", p_con env r),
adamc@403:                                                          ("concat", p_con env concat)]*)
adamc@403:                          val gs7 = unifyCons (env, denv) r concat
adamc@403:                      in
adamc@403:                          (*prefaces "The crew" [("nm", p_con env nm),
adamc@403:                                                 ("v", p_con env v),
adamc@403:                                                 ("rest", p_con env rest)];*)
adamc@403: 
adamc@403:                          gs @ gs3 @ gs4 @ gs5 @ gs6 @ gs7
adamc@403:                      end
adamc@403:                  else
adamc@403:                      raise ex
adamc@403:              end
adamc@403:              handle _ => raise ex
adamc@403:      in
adamc@403:          case (#1 c1, #1 c2) of
adamc@403:              (L'.CApp ((L'.CApp ((L'.CApp ((L'.CFold (dom, ran), _), f), _), i), _), r), _) =>
adamc@403:              unfold (dom, ran, f, i, r, c2)
adamc@403:            | (_, L'.CApp ((L'.CApp ((L'.CApp ((L'.CFold (dom, ran), _), f), _), i), _), r)) =>
adamc@403:              unfold (dom, ran, f, i, r, c1)
adamc@403:            | _ => raise ex
adamc@403:      end
adamc@403: 
adamc@403:  and unifyCons' (env, denv) c1 c2 =
adamc@403:      case (#1 c1, #1 c2) of
adamc@403:          (L'.CDisjoint (_, x1, y1, t1), L'.CDisjoint (_, x2, y2, t2)) =>
adamc@403:          let
adamc@403:              val gs1 = unifyCons' (env, denv) x1 x2
adamc@403:              val gs2 = unifyCons' (env, denv) y1 y2
adamc@403:              val (denv', gs3) = D.assert env denv (x1, y1)
adamc@403:              val gs4 = unifyCons' (env, denv') t1 t2
adamc@403:          in
adamc@403:              gs1 @ gs2 @ gs3 @ gs4
adamc@403:          end
adamc@403:        | _ =>
adamc@411:          case (kindof env c1, kindof env c2) of
adamc@411:              ((L'.KUnit, _), (L'.KUnit, _)) => []
adamc@411:            | _ =>
adamc@403:              let
adamc@411:                  val (c1, gs1) = hnormCon (env, denv) c1
adamc@411:                  val (c2, gs2) = hnormCon (env, denv) c2
adamc@403:              in
adamc@411:                  let
adamc@411:                      val gs3 = unifyCons'' (env, denv) c1 c2
adamc@411:                  in
adamc@411:                      gs1 @ gs2 @ gs3
adamc@411:                  end
adamc@411:                  handle ex => guessFold (env, denv) (c1, c2, gs1 @ gs2, ex)
adamc@403:              end
adamc@403: 
adamc@403:  and unifyCons'' (env, denv) (c1All as (c1, loc)) (c2All as (c2, _)) =
adamc@403:      let
adamc@403:          fun err f = raise CUnify' (f (c1All, c2All))
adamc@403: 
adamc@403:          fun isRecord () = unifyRecordCons (env, denv) (c1All, c2All)
adamc@403:      in
adamc@403:          (*eprefaces "unifyCons''" [("c1All", p_con env c1All),
adamc@403:                                   ("c2All", p_con env c2All)];*)
adamc@403: 
adamc@403:          case (c1, c2) of
adamc@403:              (L'.CUnit, L'.CUnit) => []
adamc@403: 
adamc@403:            | (L'.TFun (d1, r1), L'.TFun (d2, r2)) =>
adamc@403:              unifyCons' (env, denv) d1 d2
adamc@403:              @ unifyCons' (env, denv) r1 r2
adamc@403:            | (L'.TCFun (expl1, x1, d1, r1), L'.TCFun (expl2, _, d2, r2)) =>
adamc@403:              if expl1 <> expl2 then
adamc@403:                  err CExplicitness
adamc@403:              else
adamc@403:                  (unifyKinds d1 d2;
adamc@403:                   unifyCons' (E.pushCRel env x1 d1, D.enter denv) r1 r2)
adamc@403:            | (L'.TRecord r1, L'.TRecord r2) => unifyCons' (env, denv) r1 r2
adamc@403: 
adamc@403:            | (L'.CRel n1, L'.CRel n2) =>
adamc@403:              if n1 = n2 then
adamc@403:                  []
adamc@403:              else
adamc@403:                  err CIncompatible
adamc@403:            | (L'.CNamed n1, L'.CNamed n2) =>
adamc@403:              if n1 = n2 then
adamc@403:                  []
adamc@403:              else
adamc@403:                  err CIncompatible
adamc@403: 
adamc@403:            | (L'.CApp (d1, r1), L'.CApp (d2, r2)) =>
adamc@403:              (unifyCons' (env, denv) d1 d2;
adamc@403:               unifyCons' (env, denv) r1 r2)
adamc@403:            | (L'.CAbs (x1, k1, c1), L'.CAbs (_, k2, c2)) =>
adamc@403:              (unifyKinds k1 k2;
adamc@403:               unifyCons' (E.pushCRel env x1 k1, D.enter denv) c1 c2)
adamc@403: 
adamc@403:            | (L'.CName n1, L'.CName n2) =>
adamc@403:              if n1 = n2 then
adamc@403:                  []
adamc@403:              else
adamc@403:                  err CIncompatible
adamc@403: 
adamc@403:            | (L'.CModProj (n1, ms1, x1), L'.CModProj (n2, ms2, x2)) =>
adamc@403:              if n1 = n2 andalso ms1 = ms2 andalso x1 = x2 then
adamc@403:                  []
adamc@403:              else
adamc@403:                  err CIncompatible
adamc@403: 
adamc@403:            | (L'.CTuple cs1, L'.CTuple cs2) =>
adamc@403:              ((ListPair.foldlEq (fn (c1, c2, gs) =>
adamc@403:                                     let
adamc@403:                                         val gs' = unifyCons' (env, denv) c1 c2
adamc@403:                                     in
adamc@403:                                         gs' @ gs
adamc@403:                                     end) [] (cs1, cs2))
adamc@403:               handle ListPair.UnequalLengths => err CIncompatible)
adamc@403: 
adamc@403:            | (L'.CProj ((L'.CUnif (_, _, _, ref (SOME c1)), loc), n1), _) =>
adamc@403:              unifyCons' (env, denv) (L'.CProj (c1, n1), loc) c2All
adamc@403:            | (_, L'.CProj ((L'.CUnif (_, _, _, ref (SOME c2)), loc), n2)) =>
adamc@403:              unifyCons' (env, denv) c1All (L'.CProj (c2, n2), loc)
adamc@403:            | (L'.CProj ((L'.CUnif (_, (L'.KTuple ks, _), _, r), loc), n), _) =>
adamc@403:              let
adamc@403:                  val us = map (fn k => cunif (loc, k)) ks
adamc@403:              in
adamc@403:                  r := SOME (L'.CTuple us, loc);
adamc@403:                  unifyCons' (env, denv) (List.nth (us, n - 1)) c2All
adamc@403:              end
adamc@403:            | (_, L'.CProj ((L'.CUnif (_, (L'.KTuple ks, _), _, r), loc), n)) =>
adamc@403:              let
adamc@403:                  val us = map (fn k => cunif (loc, k)) ks
adamc@403:              in
adamc@403:                  r := SOME (L'.CTuple us, loc);
adamc@403:                  unifyCons' (env, denv) c1All (List.nth (us, n - 1))
adamc@403:              end
adamc@403:            | (L'.CProj (c1, n1), L'.CProj (c2, n2)) =>
adamc@403:              if n1 = n2 then
adamc@403:                  unifyCons' (env, denv) c1 c2
adamc@403:              else
adamc@403:                  err CIncompatible
adamc@403: 
adamc@403:            | (L'.CError, _) => []
adamc@403:            | (_, L'.CError) => []
adamc@403: 
adamc@403:            | (L'.CRecord _, _) => isRecord ()
adamc@403:            | (_, L'.CRecord _) => isRecord ()
adamc@403:            | (L'.CConcat _, _) => isRecord ()
adamc@403:            | (_, L'.CConcat _) => isRecord ()
adamc@403: 
adamc@403:            | (L'.CUnif (_, k1, _, r1), L'.CUnif (_, k2, _, r2)) =>
adamc@403:              if r1 = r2 then
adamc@403:                  []
adamc@403:              else
adamc@403:                  (unifyKinds k1 k2;
adamc@403:                   r1 := SOME c2All;
adamc@403:                   [])
adamc@403: 
adamc@403:            | (L'.CUnif (_, _, _, r), _) =>
adamc@403:              if occursCon r c2All then
adamc@403:                  err COccursCheckFailed
adamc@403:              else
adamc@403:                  (r := SOME c2All;
adamc@403:                   [])
adamc@403:            | (_, L'.CUnif (_, _, _, r)) =>
adamc@403:              if occursCon r c1All then
adamc@403:                  err COccursCheckFailed
adamc@403:              else
adamc@403:                  (r := SOME c1All;
adamc@403:                   [])
adamc@403: 
adamc@403:            | (L'.CFold (dom1, ran1), L'.CFold (dom2, ran2)) =>
adamc@403:              (unifyKinds dom1 dom2;
adamc@403:               unifyKinds ran1 ran2;
adamc@403:               [])
adamc@403: 
adamc@403:            | _ => err CIncompatible
adamc@403:      end
adamc@403: 
adamc@403:  and unifyCons (env, denv) c1 c2 =
adamc@403:      unifyCons' (env, denv) c1 c2
adamc@403:      handle CUnify' err => raise CUnify (c1, c2, err)
adamc@403:           | KUnify args => raise CUnify (c1, c2, CKind args)
adamc@403: 
adamc@403:  fun checkCon (env, denv) e c1 c2 =
adamc@403:      unifyCons (env, denv) c1 c2
adamc@403:      handle CUnify (c1, c2, err) =>
adamc@403:             (expError env (Unify (e, c1, c2, err));
adamc@83:              [])
adamc@403: 
adamc@403:  fun checkPatCon (env, denv) p c1 c2 =
adamc@403:      unifyCons (env, denv) c1 c2
adamc@403:      handle CUnify (c1, c2, err) =>
adamc@403:             (expError env (PatUnify (p, c1, c2, err));
adamc@86:              [])
adamc@71: 
adamc@403:  fun primType env p =
adamc@403:      case p of
adamc@403:          P.Int _ => !int
adamc@403:        | P.Float _ => !float
adamc@403:        | P.String _ => !string
adamc@403: 
adamc@403:  fun recCons (k, nm, v, rest, loc) =
adamc@403:      (L'.CConcat ((L'.CRecord (k, [(nm, v)]), loc),
adamc@403:                   rest), loc)
adamc@403: 
adamc@403:  fun foldType (dom, loc) =
adamc@403:      (L'.TCFun (L'.Explicit, "ran", (L'.KArrow ((L'.KRecord dom, loc), (L'.KType, loc)), loc),
adamc@403:                 (L'.TFun ((L'.TCFun (L'.Explicit, "nm", (L'.KName, loc),
adamc@403:                                      (L'.TCFun (L'.Explicit, "v", dom,
adamc@403:                                                 (L'.TCFun (L'.Explicit, "rest", (L'.KRecord dom, loc),
adamc@403:                                                            (L'.TFun ((L'.CApp ((L'.CRel 3, loc), (L'.CRel 0, loc)), loc),
adamc@403:                                                                      (L'.CDisjoint (L'.Instantiate,
adamc@403:                                                                                     (L'.CRecord
adamc@403:                                                                                          ((L'.KUnit, loc),
adamc@403:                                                                                           [((L'.CRel 2, loc),
adamc@403:                                                                                             (L'.CUnit, loc))]), loc),
adamc@403:                                                                                     (L'.CRel 0, loc),
adamc@403:                                                                                     (L'.CApp ((L'.CRel 3, loc),
adamc@403:                                                                                               recCons (dom,
adamc@403:                                                                                                        (L'.CRel 2, loc),
adamc@403:                                                                                                        (L'.CRel 1, loc),
adamc@403:                                                                                                        (L'.CRel 0, loc),
adamc@403:                                                                                                        loc)), loc)),
adamc@403:                                                                       loc)), loc)),
adamc@403:                                                  loc)), loc)), loc),
adamc@403:                           (L'.TFun ((L'.CApp ((L'.CRel 0, loc), (L'.CRecord (dom, []), loc)), loc),
adamc@403:                                     (L'.TCFun (L'.Explicit, "r", (L'.KRecord dom, loc),
adamc@403:                                                (L'.CApp ((L'.CRel 1, loc), (L'.CRel 0, loc)), loc)), loc)),
adamc@403:                            loc)), loc)), loc)
adamc@403: 
adamc@403:  datatype constraint =
adamc@403:           Disjoint of D.goal
adamc@403:         | TypeClass of E.env * L'.con * L'.exp option ref * ErrorMsg.span
adamc@403: 
adamc@403:  val enD = map Disjoint
adamc@403: 
adamc@403:  fun elabHead (env, denv) infer (e as (_, loc)) t =
adamc@403:      let
adamc@403:          fun unravel (t, e) =
adamc@403:              let
adamc@403:                  val (t, gs) = hnormCon (env, denv) t
adamc@403:              in
adamc@403:                  case t of
adamc@403:                      (L'.TCFun (L'.Implicit, x, k, t'), _) =>
adamc@403:                      let
adamc@403:                          val u = cunif (loc, k)
adamc@403: 
adamc@403:                          val t'' = subConInCon (0, u) t'
adamc@403:                          val (e, t, gs') = unravel (t'', (L'.ECApp (e, u), loc))
adamc@403:                      in
adamc@403:                          (*prefaces "Unravel" [("t'", p_con env t'),
adamc@403:                                              ("t''", p_con env t'')];*)
adamc@403:                          (e, t, enD gs @ gs')
adamc@403:                      end
adamc@403:                    | (L'.TFun (dom as (L'.CApp (cl, _), _), ran), _) =>
adamc@403:                      let
adamc@403:                          val cl = #1 (hnormCon (env, denv) cl)
adamc@403:                      in
adamc@403:                          if infer <> L.TypesOnly andalso E.isClass env cl then
adamc@403:                              let
adamc@403:                                  val r = ref NONE
adamc@403:                                  val (e, t, gs') = unravel (ran, (L'.EApp (e, (L'.EUnif r, loc)), loc))
adamc@403:                              in
adamc@403:                                  (e, t, TypeClass (env, dom, r, loc) :: enD gs @ gs')
adamc@403:                              end
adamc@403:                          else
adamc@403:                              (e, t, enD gs)
adamc@403:                      end
adamc@228:                   | _ => (e, t, enD gs)
adamc@86:             end
adamc@15:     in
adamc@403:         case infer of
adamc@403:             L.DontInfer => (e, t, [])
adamc@403:           | _ => unravel (t, e)
adamc@15:     end
adamc@15: 
adamc@174: fun elabPat (pAll as (p, loc), (env, denv, bound)) =
adamc@171:     let
adamc@171:         val perror = (L'.PWild, loc)
adamc@171:         val terror = (L'.CError, loc)
adamc@171:         val pterror = (perror, terror)
adamc@171:         val rerror = (pterror, (env, bound))
adamc@171: 
adamc@191:         fun pcon (pc, po, xs, to, dn, dk) =
adamc@188:             case (po, to) of
adamc@188:                 (NONE, SOME _) => (expError env (PatHasNoArg loc);
adamc@188:                                    rerror)
adamc@188:               | (SOME _, NONE) => (expError env (PatHasArg loc);
adamc@188:                                    rerror)
adamc@191:               | (NONE, NONE) =>
adamc@191:                 let
adamc@191:                     val k = (L'.KType, loc)
adamc@191:                     val unifs = map (fn _ => cunif (loc, k)) xs
adamc@191:                     val dn = foldl (fn (u, dn) => (L'.CApp (dn, u), loc)) dn unifs
adamc@191:                 in
adamc@191:                     (((L'.PCon (dk, pc, unifs, NONE), loc), dn),
adamc@191:                      (env, bound))
adamc@191:                 end
adamc@188:               | (SOME p, SOME t) =>
adamc@188:                 let
adamc@188:                     val ((p', pt), (env, bound)) = elabPat (p, (env, denv, bound))
adamc@191: 
adamc@191:                     val k = (L'.KType, loc)
adamc@191:                     val unifs = map (fn _ => cunif (loc, k)) xs
adamc@194:                     val nxs = length unifs - 1
adamc@194:                     val t = ListUtil.foldli (fn (i, u, t) => subConInCon (nxs - i, u) t) t unifs
adamc@191:                     val dn = foldl (fn (u, dn) => (L'.CApp (dn, u), loc)) dn unifs
adamc@188:                 in
adamc@191:                     ignore (checkPatCon (env, denv) p' pt t);
adamc@191:                     (((L'.PCon (dk, pc, unifs, SOME p'), loc), dn),
adamc@188:                      (env, bound))
adamc@188:                 end
adamc@171:     in
adamc@171:         case p of
adamc@171:             L.PWild => (((L'.PWild, loc), cunif (loc, (L'.KType, loc))),
adamc@171:                         (env, bound))
adamc@171:           | L.PVar x =>
adamc@171:             let
adamc@171:                 val t = if SS.member (bound, x) then
adamc@171:                             (expError env (DuplicatePatternVariable (loc, x));
adamc@171:                              terror)
adamc@171:                         else
adamc@171:                             cunif (loc, (L'.KType, loc))
adamc@171:             in
adamc@182:                 (((L'.PVar (x, t), loc), t),
adamc@171:                  (E.pushERel env x t, SS.add (bound, x)))
adamc@171:             end
adamc@173:           | L.PPrim p => (((L'.PPrim p, loc), primType env p),
adamc@173:                           (env, bound))
adamc@171:           | L.PCon ([], x, po) =>
adamc@171:             (case E.lookupConstructor env x of
adamc@174:                  NONE => (expError env (UnboundConstructor (loc, [], x));
adamc@171:                           rerror)
adamc@191:                | SOME (dk, n, xs, to, dn) => pcon (L'.PConVar n, po, xs, to, (L'.CNamed dn, loc), dk))
adamc@174:           | L.PCon (m1 :: ms, x, po) =>
adamc@174:             (case E.lookupStr env m1 of
adamc@174:                  NONE => (expError env (UnboundStrInExp (loc, m1));
adamc@174:                           rerror)
adamc@174:                | SOME (n, sgn) =>
adamc@174:                  let
adamc@174:                      val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@174:                                                 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@182:                                                     NONE => raise Fail "elabPat: Unknown substructure"
adamc@174:                                                   | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@174:                                             ((L'.StrVar n, loc), sgn) ms
adamc@174:                  in
adamc@174:                      case E.projectConstructor env {str = str, sgn = sgn, field = x} of
adamc@174:                          NONE => (expError env (UnboundConstructor (loc, m1 :: ms, x));
adamc@174:                                   rerror)
adamc@191:                        | SOME (dk, _, xs, to, dn) => pcon (L'.PConProj (n, ms, x), po, xs, to, dn, dk)
adamc@174:                  end)
adamc@174: 
adamc@175:           | L.PRecord (xps, flex) =>
adamc@175:             let
adamc@175:                 val (xpts, (env, bound, _)) =
adamc@175:                     ListUtil.foldlMap (fn ((x, p), (env, bound, fbound)) =>
adamc@175:                                           let
adamc@175:                                               val ((p', t), (env, bound)) = elabPat (p, (env, denv, bound))
adamc@175:                                           in
adamc@175:                                               if SS.member (fbound, x) then
adamc@175:                                                   expError env (DuplicatePatField (loc, x))
adamc@175:                                               else
adamc@175:                                                   ();
adamc@175:                                               ((x, p', t), (env, bound, SS.add (fbound, x)))
adamc@175:                                           end)
adamc@175:                     (env, bound, SS.empty) xps
adamc@175: 
adamc@175:                 val k = (L'.KType, loc)
adamc@175:                 val c = (L'.CRecord (k, map (fn (x, _, t) => ((L'.CName x, loc), t)) xpts), loc)
adamc@176:                 val c =
adamc@175:                     if flex then
adamc@176:                         (L'.CConcat (c, cunif (loc, (L'.KRecord k, loc))), loc)
adamc@175:                     else
adamc@176:                         c
adamc@175:             in
adamc@182:                 (((L'.PRecord xpts, loc),
adamc@175:                   (L'.TRecord c, loc)),
adamc@175:                  (env, bound))
adamc@175:             end
adamc@175:                                            
adamc@171:     end
adamc@171: 
adamc@172: datatype coverage =
adamc@172:          Wild
adamc@173:        | None
adamc@172:        | Datatype of coverage IM.map
adamc@175:        | Record of coverage SM.map list
adamc@172: 
adamc@243: fun c2s c =
adamc@243:     case c of
adamc@243:         Wild => "Wild"
adamc@243:       | None => "None"
adamc@243:       | Datatype _ => "Datatype"
adamc@243:       | Record _ => "Record"
adamc@243: 
adamc@172: fun exhaustive (env, denv, t, ps) =
adamc@172:     let
adamc@402:         fun depth (p, _) =
adamc@402:             case p of
adamc@402:                 L'.PWild => 0
adamc@402:               | L'.PVar _ => 0
adamc@402:               | L'.PPrim _ => 0
adamc@402:               | L'.PCon (_, _, _, NONE) => 1
adamc@402:               | L'.PCon (_, _, _, SOME p) => 1 + depth p
adamc@402:               | L'.PRecord xps => foldl (fn ((_, p, _), n) => Int.max (depth p, n)) 0 xps
adamc@402: 
adamc@402:         val depth = 1 + foldl (fn (p, n) => Int.max (depth p, n)) 0 ps
adamc@402: 
adamc@172:         fun pcCoverage pc =
adamc@172:             case pc of
adamc@172:                 L'.PConVar n => n
adamc@174:               | L'.PConProj (m1, ms, x) =>
adamc@174:                 let
adamc@174:                     val (str, sgn) = E.chaseMpath env (m1, ms)
adamc@174:                 in
adamc@174:                     case E.projectConstructor env {str = str, sgn = sgn, field = x} of
adamc@174:                         NONE => raise Fail "exhaustive: Can't project constructor"
adamc@191:                       | SOME (_, n, _, _, _) => n
adamc@174:                 end
adamc@172: 
adamc@172:         fun coverage (p, _) =
adamc@172:             case p of
adamc@172:                 L'.PWild => Wild
adamc@172:               | L'.PVar _ => Wild
adamc@173:               | L'.PPrim _ => None
adamc@191:               | L'.PCon (_, pc, _, NONE) => Datatype (IM.insert (IM.empty, pcCoverage pc, Wild))
adamc@191:               | L'.PCon (_, pc, _, SOME p) => Datatype (IM.insert (IM.empty, pcCoverage pc, coverage p))
adamc@182:               | L'.PRecord xps => Record [foldl (fn ((x, p, _), fmap) =>
adamc@182:                                                     SM.insert (fmap, x, coverage p)) SM.empty xps]
adamc@176: 
adamc@172:         fun merge (c1, c2) =
adamc@172:             case (c1, c2) of
adamc@173:                 (None, _) => c2
adamc@173:               | (_, None) => c1
adamc@173:                 
adamc@173:               | (Wild, _) => Wild
adamc@172:               | (_, Wild) => Wild
adamc@172: 
adamc@172:               | (Datatype cm1, Datatype cm2) => Datatype (IM.unionWith merge (cm1, cm2))
adamc@172: 
adamc@175:               | (Record fm1, Record fm2) => Record (fm1 @ fm2)
adamc@175: 
adamc@175:               | _ => None
adamc@175: 
adamc@172:         fun combinedCoverage ps =
adamc@172:             case ps of
adamc@172:                 [] => raise Fail "Empty pattern list for coverage checking"
adamc@172:               | [p] => coverage p
adamc@172:               | p :: ps => merge (coverage p, combinedCoverage ps)
adamc@172: 
adamc@402:         fun enumerateCases depth t =
adamc@402:             if depth = 0 then
adamc@402:                 [Wild]
adamc@402:             else
adamc@402:                 let
adamc@402:                     fun dtype cons =
adamc@402:                         ListUtil.mapConcat (fn (_, n, to) =>
adamc@402:                                                case to of
adamc@402:                                                    NONE => [Datatype (IM.insert (IM.empty, n, Wild))]
adamc@402:                                                  | SOME t => map (fn c => Datatype (IM.insert (IM.empty, n, c)))
adamc@402:                                                                  (enumerateCases (depth-1) t)) cons
adamc@402:                 in
adamc@402:                     case #1 (#1 (hnormCon (env, denv) t)) of
adamc@402:                         L'.CNamed n =>
adamc@402:                         (let
adamc@402:                              val dt = E.lookupDatatype env n
adamc@402:                              val cons = E.constructors dt
adamc@175:                          in
adamc@402:                              dtype cons
adamc@402:                          end handle E.UnboundNamed _ => [Wild])
adamc@402:                       | L'.TRecord c =>
adamc@402:                         (case #1 (#1 (hnormCon (env, denv) c)) of
adamc@402:                              L'.CRecord (_, xts) =>
adamc@402:                              let
adamc@402:                                  val xts = map (fn (x, t) => (#1 (hnormCon (env, denv) x), t)) xts
adamc@402: 
adamc@402:                                  fun exponentiate fs =
adamc@402:                                      case fs of
adamc@402:                                          [] => [SM.empty]
adamc@402:                                        | ((L'.CName x, _), t) :: rest =>
adamc@402:                                          let
adamc@402:                                              val this = enumerateCases depth t
adamc@402:                                              val rest = exponentiate rest
adamc@402:                                          in
adamc@402:                                              ListUtil.mapConcat (fn fmap =>
adamc@402:                                                                     map (fn c => SM.insert (fmap, x, c)) this) rest
adamc@402:                                          end
adamc@402:                                        | _ => raise Fail "exponentiate: Not CName"
adamc@402:                              in
adamc@402:                                  if List.exists (fn ((L'.CName _, _), _) => false
adamc@402:                                                   | (c, _) => true) xts then
adamc@402:                                      [Wild]
adamc@402:                                  else
adamc@402:                                      map (fn ls => Record [ls]) (exponentiate xts)
adamc@402:                              end
adamc@402:                            | _ => [Wild])
adamc@402:                       | _ => [Wild]
adamc@402:                 end
adamc@175: 
adamc@175:         fun coverageImp (c1, c2) =
adamc@243:             let
adamc@243:                 val r =
adamc@243:                     case (c1, c2) of
adamc@243:                         (Wild, _) => true
adamc@243: 
adamc@243:                       | (Datatype cmap1, Datatype cmap2) =>
adamc@243:                         List.all (fn (n, c2) =>
adamc@243:                                      case IM.find (cmap1, n) of
adamc@243:                                          NONE => false
adamc@243:                                        | SOME c1 => coverageImp (c1, c2)) (IM.listItemsi cmap2)
adamc@243:                       | (Datatype cmap1, Wild) =>
adamc@243:                         List.all (fn (n, c1) => coverageImp (c1, Wild)) (IM.listItemsi cmap1)
adamc@243: 
adamc@243:                       | (Record fmaps1, Record fmaps2) =>
adamc@243:                         List.all (fn fmap2 =>
adamc@243:                                      List.exists (fn fmap1 =>
adamc@243:                                                      List.all (fn (x, c2) =>
adamc@243:                                                                   case SM.find (fmap1, x) of
adamc@243:                                                                       NONE => true
adamc@243:                                                                     | SOME c1 => coverageImp (c1, c2))
adamc@243:                                                               (SM.listItemsi fmap2))
adamc@243:                                                  fmaps1) fmaps2
adamc@243: 
adamc@243:                       | (Record fmaps1, Wild) =>
adamc@243:                         List.exists (fn fmap1 =>
adamc@243:                                         List.all (fn (x, c1) => coverageImp (c1, Wild))
adamc@243:                                         (SM.listItemsi fmap1)) fmaps1
adamc@243: 
adamc@243:                       | _ => false
adamc@243:             in
adamc@243:                 (*TextIO.print ("coverageImp(" ^ c2s c1 ^ ", " ^ c2s c2 ^ ") = " ^ Bool.toString r ^ "\n");*)
adamc@243:                 r
adamc@243:             end
adamc@175: 
adamc@172:         fun isTotal (c, t) =
adamc@172:             case c of
adamc@173:                 None => (false, [])
adamc@173:               | Wild => (true, [])
adamc@172:               | Datatype cm =>
adamc@172:                 let
adamc@172:                     val ((t, _), gs) = hnormCon (env, denv) t
adamc@174: 
adamc@174:                     fun dtype cons =
adamc@174:                         foldl (fn ((_, n, to), (total, gs)) =>
adamc@174:                                   case IM.find (cm, n) of
adamc@174:                                       NONE => (false, gs)
adamc@174:                                     | SOME c' =>
adamc@174:                                       case to of
adamc@174:                                           NONE => (total, gs)
adamc@174:                                         | SOME t' =>
adamc@174:                                           let
adamc@174:                                               val (total, gs') = isTotal (c', t')
adamc@174:                                           in
adamc@174:                                               (total, gs' @ gs)
adamc@174:                                           end)
adamc@174:                               (true, gs) cons
adamc@191: 
adamc@191:                     fun unapp t =
adamc@191:                         case t of
adamc@191:                             L'.CApp ((t, _), _) => unapp t
adamc@191:                           | _ => t
adamc@172:                 in
adamc@191:                     case unapp t of
adamc@172:                         L'.CNamed n =>
adamc@172:                         let
adamc@172:                             val dt = E.lookupDatatype env n
adamc@172:                             val cons = E.constructors dt
adamc@172:                         in
adamc@174:                             dtype cons
adamc@174:                         end
adamc@174:                       | L'.CModProj (m1, ms, x) =>
adamc@174:                         let
adamc@174:                             val (str, sgn) = E.chaseMpath env (m1, ms)
adamc@174:                         in
adamc@174:                             case E.projectDatatype env {str = str, sgn = sgn, field = x} of
adamc@174:                                 NONE => raise Fail "isTotal: Can't project datatype"
adamc@191:                               | SOME (_, cons) => dtype cons
adamc@172:                         end
adamc@172:                       | L'.CError => (true, gs)
adamc@341:                       | c =>
adamc@341:                         (prefaces "Not a datatype" [("c", p_con env (c, ErrorMsg.dummySpan))];
adamc@341:                          raise Fail "isTotal: Not a datatype")
adamc@172:                 end
adamc@402:               | Record _ => (List.all (fn c2 => coverageImp (c, c2)) (enumerateCases depth t), [])
adamc@172:     in
adamc@172:         isTotal (combinedCoverage ps, t)
adamc@172:     end
adamc@172: 
adamc@217: fun unmodCon env (c, loc) =
adamc@217:     case c of
adamc@217:         L'.CNamed n =>
adamc@217:         (case E.lookupCNamed env n of
adamc@217:              (_, _, SOME (c as (L'.CModProj _, _))) => unmodCon env c
adamc@217:            | _ => (c, loc))
adamc@217:       | L'.CModProj (m1, ms, x) =>
adamc@217:         let
adamc@217:             val (str, sgn) = E.chaseMpath env (m1, ms)
adamc@217:         in
adamc@217:             case E.projectCon env {str = str, sgn = sgn, field = x} of
adamc@217:                 NONE => raise Fail "unmodCon: Can't projectCon"
adamc@217:               | SOME (_, SOME (c as (L'.CModProj _, _))) => unmodCon env c
adamc@217:               | _ => (c, loc)
adamc@217:         end
adamc@217:       | _ => (c, loc)
adamc@217: 
adamc@467: fun normClassKey envs c =
adamc@467:     let
adamc@467:         val c = ElabOps.hnormCon envs c
adamc@467:     in
adamc@467:         case #1 c of
adamc@467:             L'.CApp (c1, c2) =>
adamc@467:             let
adamc@467:                 val c1 = normClassKey envs c1
adamc@467:                 val c2 = normClassKey envs c2
adamc@467:             in
adamc@467:                 (L'.CApp (c1, c2), #2 c)
adamc@467:             end
adamc@467:           | _ => c
adamc@467:     end
adamc@467: 
adamc@467: fun normClassConstraint env (c, loc) =
adamc@217:     case c of
adamc@217:         L'.CApp (f, x) =>
adamc@217:         let
adamc@467:             val f = unmodCon env f
adamc@467:             val x = normClassKey env x
adamc@217:         in
adamc@467:             (L'.CApp (f, x), loc)
adamc@217:         end
adamc@467:       | L'.CUnif (_, _, _, ref (SOME c)) => normClassConstraint env c
adamc@467:       | _ => (c, loc)
adamc@216: 
adamc@447: 
adamc@447: val makeInstantiable =
adamc@447:     let
adamc@447:         fun kind k = k
adamc@447:         fun con c =
adamc@447:             case c of
adamc@447:                 L'.CDisjoint (L'.LeaveAlone, c1, c2, c) => L'.CDisjoint (L'.Instantiate, c1, c2, c)
adamc@447:               | _ => c
adamc@447:     in
adamc@447:         U.Con.map {kind = kind, con = con}
adamc@447:     end
adamc@447: 
adamc@92: fun elabExp (env, denv) (eAll as (e, loc)) =
adamc@91:     let
adamc@280:         (*val () = eprefaces "elabExp" [("eAll", SourcePrint.p_exp eAll)];*)
adamc@280: 
adamc@280:         val r = case e of
adamc@91:             L.EAnnot (e, t) =>
adamc@91:             let
adamc@91:                 val (e', et, gs1) = elabExp (env, denv) e
adamc@91:                 val (t', _, gs2) = elabCon (env, denv) t
adamc@91:                 val gs3 = checkCon (env, denv) e' et t'
adamc@91:             in
adamc@228:                 (e', t', gs1 @ enD gs2 @ enD gs3)
adamc@91:             end
adamc@34: 
adamc@91:           | L.EPrim p => ((L'.EPrim p, loc), primType env p, [])
adamc@403:           | L.EVar ([], s, infer) =>
adamc@91:             (case E.lookupE env s of
adamc@91:                  E.NotBound =>
adamc@91:                  (expError env (UnboundExp (loc, s));
adamc@91:                   (eerror, cerror, []))
adamc@403:                | E.Rel (n, t) => elabHead (env, denv) infer (L'.ERel n, loc) t
adamc@403:                | E.Named (n, t) => elabHead (env, denv) infer (L'.ENamed n, loc) t)
adamc@403:           | L.EVar (m1 :: ms, s, infer) =>
adamc@91:             (case E.lookupStr env m1 of
adamc@91:                  NONE => (expError env (UnboundStrInExp (loc, m1));
adamc@91:                           (eerror, cerror, []))
adamc@91:                | SOME (n, sgn) =>
adamc@91:                  let
adamc@91:                      val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@91:                                                 case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@91:                                                     NONE => (conError env (UnboundStrInCon (loc, m));
adamc@91:                                                              (strerror, sgnerror))
adamc@91:                                                   | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@91:                                             ((L'.StrVar n, loc), sgn) ms
adamc@10: 
adamc@91:                      val t = case E.projectVal env {sgn = sgn, str = str, field = s} of
adamc@91:                                  NONE => (expError env (UnboundExp (loc, s));
adamc@91:                                           cerror)
adamc@91:                                | SOME t => t
adamc@91:                  in
adamc@403:                      elabHead (env, denv) infer (L'.EModProj (n, ms, s), loc) t
adamc@91:                  end)
adamc@86: 
adamc@349:           | L.EWild =>
adamc@210:             let
adamc@349:                 val r = ref NONE
adamc@349:                 val c = cunif (loc, (L'.KType, loc))
adamc@210:             in
adamc@349:                 ((L'.EUnif r, loc), c, [TypeClass (env, c, r, loc)])
adamc@210:             end
adamc@210: 
adamc@91:           | L.EApp (e1, e2) =>
adamc@91:             let
adamc@91:                 val (e1', t1, gs1) = elabExp (env, denv) e1
adamc@403:                 val (e2', t2, gs2) = elabExp (env, denv) e2
adamc@71: 
adamc@91:                 val dom = cunif (loc, ktype)
adamc@91:                 val ran = cunif (loc, ktype)
adamc@91:                 val t = (L'.TFun (dom, ran), dummy)
adamc@91: 
adamc@403:                 val gs3 = checkCon (env, denv) e1' t1 t
adamc@403:                 val gs4 = checkCon (env, denv) e2' t2 dom
adamc@403: 
adamc@403:                 val gs = gs1 @ gs2 @ enD gs3 @ enD gs4
adamc@91:             in
adamc@205:                 ((L'.EApp (e1', e2'), loc), ran, gs)
adamc@91:             end
adamc@91:           | L.EAbs (x, to, e) =>
adamc@91:             let
adamc@91:                 val (t', gs1) = case to of
adamc@91:                                     NONE => (cunif (loc, ktype), [])
adamc@91:                                   | SOME t =>
adamc@91:                                     let
adamc@91:                                         val (t', tk, gs) = elabCon (env, denv) t
adamc@91:                                     in
adamc@91:                                         checkKind env t' tk ktype;
adamc@91:                                         (t', gs)
adamc@91:                                     end
adamc@467:                 val dom = normClassConstraint env t'
adamc@467:                 val (e', et, gs2) = elabExp (E.pushERel env x dom, denv) e
adamc@91:             in
adamc@91:                 ((L'.EAbs (x, t', et, e'), loc),
adamc@91:                  (L'.TFun (t', et), loc),
adamc@467:                  enD gs1 @ gs2)
adamc@91:             end
adamc@91:           | L.ECApp (e, c) =>
adamc@91:             let
adamc@91:                 val (e', et, gs1) = elabExp (env, denv) e
adamc@328:                 val oldEt = et
adamc@403:                 val (c', ck, gs2) = elabCon (env, denv) c
adamc@403:                 val ((et', _), gs3) = hnormCon (env, denv) et
adamc@91:             in
adamc@91:                 case et' of
adamc@91:                     L'.CError => (eerror, cerror, [])
adamc@328:                   | L'.TCFun (_, x, k, eb) =>
adamc@91:                     let
adamc@91:                         val () = checkKind env c' ck k
adamc@91:                         val eb' = subConInCon (0, c') eb
adamc@339:                             handle SynUnif => (expError env (Unif ("substitution", loc, eb));
adamc@91:                                                cerror)
adamc@91:                     in
adamc@328:                         (*prefaces "Elab ECApp" [("e", SourcePrint.p_exp eAll),
adamc@328:                                                ("et", p_con env oldEt),
adamc@328:                                                ("x", PD.string x),
adamc@328:                                                ("eb", p_con (E.pushCRel env x k) eb),
adamc@328:                                                ("c", p_con env c'),
adamc@328:                                                ("eb'", p_con env eb')];*)
adamc@403:                         ((L'.ECApp (e', c'), loc), eb', gs1 @ enD gs2 @ enD gs3)
adamc@91:                     end
adamc@91: 
adamc@91:                   | _ =>
adamc@91:                     (expError env (WrongForm ("constructor function", e', et));
adamc@91:                      (eerror, cerror, []))
adamc@91:             end
adamc@91:           | L.ECAbs (expl, x, k, e) =>
adamc@91:             let
adamc@91:                 val expl' = elabExplicitness expl
adamc@91:                 val k' = elabKind k
adamc@328: 
adamc@328:                 val env' = E.pushCRel env x k'
adamc@328:                 val (e', et, gs) = elabExp (env', D.enter denv) e
adamc@91:             in
adamc@91:                 ((L'.ECAbs (expl', x, k', e'), loc),
adamc@91:                  (L'.TCFun (expl', x, k', et), loc),
adamc@91:                  gs)
adamc@91:             end
adamc@91: 
adamc@91:           | L.EDisjoint (c1, c2, e) =>
adamc@91:             let
adamc@91:                 val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@91:                 val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@91: 
adamc@91:                 val ku1 = kunif loc
adamc@91:                 val ku2 = kunif loc
adamc@91: 
adamc@91:                 val (denv', gs3) = D.assert env denv (c1', c2')
adamc@91:                 val (e', t, gs4) = elabExp (env, denv') e
adamc@91:             in
adamc@91:                 checkKind env c1' k1 (L'.KRecord ku1, loc);
adamc@91:                 checkKind env c2' k2 (L'.KRecord ku2, loc);
adamc@91: 
adamc@345:                 (e', (L'.CDisjoint (L'.LeaveAlone, c1', c2', t), loc), enD gs1 @ enD gs2 @ enD gs3 @ gs4)
adamc@91:             end
adamc@91: 
adamc@91:           | L.ERecord xes =>
adamc@91:             let
adamc@91:                 val (xes', gs) = ListUtil.foldlMap (fn ((x, e), gs) =>
adamc@91:                                                        let
adamc@91:                                                            val (x', xk, gs1) = elabCon (env, denv) x
adamc@91:                                                            val (e', et, gs2) = elabExp (env, denv) e
adamc@91:                                                        in
adamc@91:                                                            checkKind env x' xk kname;
adamc@228:                                                            ((x', e', et), enD gs1 @ gs2 @ gs)
adamc@91:                                                        end)
adamc@91:                                                    [] xes
adamc@91: 
adamc@91:                 val k = (L'.KType, loc)
adamc@91: 
adamc@91:                 fun prove (xets, gs) =
adamc@91:                     case xets of
adamc@91:                         [] => gs
adamc@91:                       | (x, _, t) :: rest =>
adamc@91:                         let
adamc@91:                             val xc = (x, t)
adamc@91:                             val r1 = (L'.CRecord (k, [xc]), loc)
adamc@91:                             val gs = foldl (fn ((x', _, t'), gs) =>
adamc@91:                                                let
adamc@91:                                                    val xc' = (x', t')
adamc@91:                                                    val r2 = (L'.CRecord (k, [xc']), loc)
adamc@91:                                                in
adamc@91:                                                    D.prove env denv (r1, r2, loc) @ gs
adamc@91:                                                end)
adamc@91:                                            gs rest
adamc@91:                         in
adamc@91:                             prove (rest, gs)
adamc@91:                         end
adamc@228: 
adamc@228:                 val gsD = List.mapPartial (fn Disjoint d => SOME d | _ => NONE) gs
adamc@228:                 val gsO = List.filter (fn Disjoint _ => false | _ => true) gs
adamc@91:             in
adamc@255:                 (*TextIO.print ("|gsO| = " ^ Int.toString (length gsO) ^ "\n");*)
adamc@91:                 ((L'.ERecord xes', loc),
adamc@91:                  (L'.TRecord (L'.CRecord (ktype, map (fn (x', _, et) => (x', et)) xes'), loc), loc),
adamc@228:                  enD (prove (xes', gsD)) @ gsO)
adamc@91:             end
adamc@91: 
adamc@91:           | L.EField (e, c) =>
adamc@91:             let
adamc@91:                 val (e', et, gs1) = elabExp (env, denv) e
adamc@91:                 val (c', ck, gs2) = elabCon (env, denv) c
adamc@91: 
adamc@91:                 val ft = cunif (loc, ktype)
adamc@91:                 val rest = cunif (loc, ktype_record)
adamc@91:                 val first = (L'.CRecord (ktype, [(c', ft)]), loc)
adamc@91:                             
adamc@91:                 val gs3 =
adamc@91:                     checkCon (env, denv) e' et
adamc@91:                              (L'.TRecord (L'.CConcat (first, rest), loc), loc)
adamc@91:                 val gs4 = D.prove env denv (first, rest, loc)
adamc@91:             in
adamc@228:                 ((L'.EField (e', c', {field = ft, rest = rest}), loc), ft, gs1 @ enD gs2 @ enD gs3 @ enD gs4)
adamc@91:             end
adamc@91: 
adamc@445:           | L.EConcat (e1, e2) =>
adamc@339:             let
adamc@339:                 val (e1', e1t, gs1) = elabExp (env, denv) e1
adamc@445:                 val (e2', e2t, gs2) = elabExp (env, denv) e2
adamc@445: 
adamc@445:                 val r1 = cunif (loc, ktype_record)
adamc@445:                 val r2 = cunif (loc, ktype_record)
adamc@445: 
adamc@445:                 val gs3 = checkCon (env, denv) e1' e1t (L'.TRecord r1, loc)
adamc@445:                 val gs4 = checkCon (env, denv) e2' e2t (L'.TRecord r2, loc)
adamc@445:                 val gs5 = D.prove env denv (r1, r2, loc)
adamc@339:             in
adamc@445:                 ((L'.EConcat (e1', r1, e2', r2), loc),
adamc@445:                  (L'.TRecord ((L'.CConcat (r1, r2), loc)), loc),
adamc@445:                  gs1 @ gs2 @ enD gs3 @ enD gs4 @ enD gs5)
adamc@339:             end
adamc@149:           | L.ECut (e, c) =>
adamc@149:             let
adamc@149:                 val (e', et, gs1) = elabExp (env, denv) e
adamc@149:                 val (c', ck, gs2) = elabCon (env, denv) c
adamc@149: 
adamc@149:                 val ft = cunif (loc, ktype)
adamc@149:                 val rest = cunif (loc, ktype_record)
adamc@149:                 val first = (L'.CRecord (ktype, [(c', ft)]), loc)
adamc@149:                             
adamc@149:                 val gs3 =
adamc@149:                     checkCon (env, denv) e' et
adamc@149:                              (L'.TRecord (L'.CConcat (first, rest), loc), loc)
adamc@149:                 val gs4 = D.prove env denv (first, rest, loc)
adamc@149:             in
adamc@228:                 ((L'.ECut (e', c', {field = ft, rest = rest}), loc), (L'.TRecord rest, loc),
adamc@228:                  gs1 @ enD gs2 @ enD gs3 @ enD gs4)
adamc@149:             end
adamc@149: 
adamc@91:           | L.EFold =>
adamc@91:             let
adamc@91:                 val dom = kunif loc
adamc@91:             in
adamc@91:                 ((L'.EFold dom, loc), foldType (dom, loc), [])
adamc@91:             end
adamc@170: 
adamc@171:           | L.ECase (e, pes) =>
adamc@171:             let
adamc@171:                 val (e', et, gs1) = elabExp (env, denv) e
adamc@171:                 val result = cunif (loc, (L'.KType, loc))
adamc@171:                 val (pes', gs) = ListUtil.foldlMap
adamc@171:                                  (fn ((p, e), gs) =>
adamc@171:                                      let
adamc@174:                                          val ((p', pt), (env, _)) = elabPat (p, (env, denv, SS.empty))
adamc@171: 
adamc@171:                                          val gs1 = checkPatCon (env, denv) p' pt et
adamc@171:                                          val (e', et, gs2) = elabExp (env, denv) e
adamc@171:                                          val gs3 = checkCon (env, denv) e' et result
adamc@171:                                      in
adamc@228:                                          ((p', e'), enD gs1 @ gs2 @ enD gs3 @ gs)
adamc@171:                                      end)
adamc@171:                                  gs1 pes
adamc@172: 
adamc@172:                 val (total, gs') = exhaustive (env, denv, et, map #1 pes')
adamc@171:             in
adamc@172:                 if total then
adamc@172:                     ()
adamc@172:                 else
adamc@172:                     expError env (Inexhaustive loc);
adamc@172: 
adamc@228:                 ((L'.ECase (e', pes', {disc = et, result = result}), loc), result, enD gs' @ gs)
adamc@171:             end
adamc@447: 
adamc@447:           | L.ELet (eds, e) =>
adamc@447:             let
adamc@447:                 val (eds, (env, gs1)) = ListUtil.foldlMap (elabEdecl denv) (env, []) eds
adamc@447:                 val (e, t, gs2) = elabExp (env, denv) e
adamc@447:             in
adamc@447:                 ((L'.ELet (eds, e), loc), t, gs1 @ gs2)
adamc@447:             end
adamc@280:     in
adamc@402:         (*prefaces "/elabExp" [("e", SourcePrint.p_exp eAll)];*)
adamc@280:         r
adamc@91:     end
adamc@31: 
adamc@447: and elabEdecl denv (dAll as (d, loc), (env, gs : constraint list)) =
adamc@447:     let
adamc@447:         val r = 
adamc@447:             case d of
adamc@447:                 L.EDVal (x, co, e) =>
adamc@447:                 let
adamc@447:                     val (c', _, gs1) = case co of
adamc@447:                                            NONE => (cunif (loc, ktype), ktype, [])
adamc@447:                                          | SOME c => elabCon (env, denv) c
adamc@447: 
adamc@447:                     val (e', et, gs2) = elabExp (env, denv) e
adamc@447:                     val gs3 = checkCon (env, denv) e' et c'
adamc@467:                     val c' = normClassConstraint env c'
adamc@447:                     val env' = E.pushERel env x c'
adamc@447:                     val c' = makeInstantiable c'
adamc@447:                 in
adamc@467:                     ((L'.EDVal (x, c', e'), loc), (env', enD gs1 @ gs2 @ enD gs3 @ gs))
adamc@447:                 end
adamc@447:               | L.EDValRec vis =>
adamc@447:                 let
adamc@447:                     fun allowable (e, _) =
adamc@447:                         case e of
adamc@447:                             L.EAbs _ => true
adamc@447:                           | L.ECAbs (_, _, _, e) => allowable e
adamc@447:                           | L.EDisjoint (_, _, e) => allowable e
adamc@447:                           | _ => false
adamc@447: 
adamc@447:                     val (vis, gs) = ListUtil.foldlMap
adamc@447:                                         (fn ((x, co, e), gs) =>
adamc@447:                                             let
adamc@447:                                                 val (c', _, gs1) = case co of
adamc@447:                                                                        NONE => (cunif (loc, ktype), ktype, [])
adamc@447:                                                                      | SOME c => elabCon (env, denv) c
adamc@447:                                             in
adamc@447:                                                 ((x, c', e), enD gs1 @ gs)
adamc@447:                                             end) gs vis
adamc@447: 
adamc@447:                     val env = foldl (fn ((x, c', _), env) => E.pushERel env x c') env vis
adamc@447: 
adamc@447:                     val (vis, gs) = ListUtil.foldlMap (fn ((x, c', e), gs) =>
adamc@447:                                                           let
adamc@447:                                                               val (e', et, gs1) = elabExp (env, denv) e
adamc@447:                                                                                   
adamc@447:                                                               val gs2 = checkCon (env, denv) e' et c'
adamc@447: 
adamc@447:                                                               val c' = makeInstantiable c'
adamc@447:                                                           in
adamc@447:                                                               if allowable e then
adamc@447:                                                                   ()
adamc@447:                                                               else
adamc@447:                                                                   expError env (IllegalRec (x, e'));
adamc@447:                                                               ((x, c', e'), gs1 @ enD gs2 @ gs)
adamc@447:                                                           end) gs vis
adamc@447:                 in
adamc@447:                     ((L'.EDValRec vis, loc), (env, gs))
adamc@447:                 end
adamc@447:     in
adamc@447:         r
adamc@447:     end
adamc@447: 
adamc@42: val hnormSgn = E.hnormSgn
adamc@31: 
adamc@210: fun tableOf () = (L'.CModProj (!basis_r, [], "sql_table"), ErrorMsg.dummySpan)
adamc@338: fun sequenceOf () = (L'.CModProj (!basis_r, [], "sql_sequence"), ErrorMsg.dummySpan)
adamc@459: fun cookieOf () = (L'.CModProj (!basis_r, [], "http_cookie"), ErrorMsg.dummySpan)
adamc@205: 
adamc@88: fun elabSgn_item ((sgi, loc), (env, denv, gs)) =
adamc@76:     case sgi of
adamc@76:         L.SgiConAbs (x, k) =>
adamc@76:         let
adamc@76:             val k' = elabKind k
adamc@31: 
adamc@76:             val (env', n) = E.pushCNamed env x k' NONE
adamc@76:         in
adamc@88:             ([(L'.SgiConAbs (x, n, k'), loc)], (env', denv, gs))
adamc@76:         end
adamc@31: 
adamc@76:       | L.SgiCon (x, ko, c) =>
adamc@76:         let
adamc@76:             val k' = case ko of
adamc@76:                          NONE => kunif loc
adamc@76:                        | SOME k => elabKind k
adamc@31: 
adamc@83:             val (c', ck, gs') = elabCon (env, denv) c
adamc@76:             val (env', n) = E.pushCNamed env x k' (SOME c')
adamc@76:         in
adamc@76:             checkKind env c' ck k';
adamc@31: 
adamc@88:             ([(L'.SgiCon (x, n, k', c'), loc)], (env', denv, gs' @ gs))
adamc@76:         end
adamc@31: 
adamc@191:       | L.SgiDatatype (x, xs, xcs) =>
adamc@157:         let
adamc@157:             val k = (L'.KType, loc)
adamc@191:             val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191:             val (env, n) = E.pushCNamed env x k' NONE
adamc@157:             val t = (L'.CNamed n, loc)
adamc@194:             val nxs = length xs - 1
adamc@194:             val t = ListUtil.foldli (fn (i, _, t) => (L'.CApp (t, (L'.CRel (nxs - i), loc)), loc)) t xs
adamc@157: 
adamc@284:             val (env', denv') = foldl (fn (x, (env', denv')) =>
adamc@284:                                           (E.pushCRel env' x k,
adamc@284:                                            D.enter denv')) (env, denv) xs
adamc@284: 
adamc@157:             val (xcs, (used, env, gs)) =
adamc@157:                 ListUtil.foldlMap
adamc@157:                 (fn ((x, to), (used, env, gs)) =>
adamc@157:                     let
adamc@157:                         val (to, t, gs') = case to of
adamc@157:                                            NONE => (NONE, t, gs)
adamc@157:                                          | SOME t' =>
adamc@157:                                            let
adamc@284:                                                val (t', tk, gs') = elabCon (env', denv') t'
adamc@157:                                            in
adamc@284:                                                checkKind env' t' tk k;
adamc@157:                                                (SOME t', (L'.TFun (t', t), loc), gs' @ gs)
adamc@157:                                            end
adamc@191:                         val t = foldl (fn (x, t) => (L'.TCFun (L'.Implicit, x, k, t), loc)) t xs
adamc@157: 
adamc@157:                         val (env, n') = E.pushENamed env x t
adamc@157:                     in
adamc@157:                         if SS.member (used, x) then
adamc@157:                             strError env (DuplicateConstructor (x, loc))
adamc@157:                         else
adamc@157:                             ();
adamc@157:                         ((x, n', to), (SS.add (used, x), env, gs'))
adamc@157:                     end)
adamc@157:                 (SS.empty, env, []) xcs
adamc@191: 
adamc@191:             val env = E.pushDatatype env n xs xcs
adamc@157:         in
adamc@191:             ([(L'.SgiDatatype (x, n, xs, xcs), loc)], (env, denv, gs))
adamc@157:         end
adamc@156: 
adamc@158:       | L.SgiDatatypeImp (_, [], _) => raise Fail "Empty SgiDatatypeImp"
adamc@158: 
adamc@158:       | L.SgiDatatypeImp (x, m1 :: ms, s) =>
adamc@158:         (case E.lookupStr env m1 of
adamc@158:              NONE => (strError env (UnboundStr (loc, m1));
adamc@158:                       ([], (env, denv, gs)))
adamc@158:            | SOME (n, sgn) =>
adamc@158:              let
adamc@158:                  val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@158:                                      case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@158:                                          NONE => (conError env (UnboundStrInCon (loc, m));
adamc@158:                                                   (strerror, sgnerror))
adamc@158:                                        | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@158:                                   ((L'.StrVar n, loc), sgn) ms
adamc@158:              in
adamc@161:                  case hnormCon (env, denv) (L'.CModProj (n, ms, s), loc) of
adamc@161:                      ((L'.CModProj (n, ms, s), _), gs) =>
adamc@161:                      (case E.projectDatatype env {sgn = sgn, str = str, field = s} of
adamc@161:                           NONE => (conError env (UnboundDatatype (loc, s));
adamc@161:                                    ([], (env, denv, gs)))
adamc@191:                         | SOME (xs, xncs) =>
adamc@161:                           let
adamc@161:                               val k = (L'.KType, loc)
adamc@191:                               val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191: 
adamc@161:                               val t = (L'.CModProj (n, ms, s), loc)
adamc@191:                               val (env, n') = E.pushCNamed env x k' (SOME t)
adamc@191:                               val env = E.pushDatatype env n' xs xncs
adamc@158: 
adamc@161:                               val t = (L'.CNamed n', loc)
adamc@161:                               val env = foldl (fn ((x, n, to), env) =>
adamc@161:                                                   let
adamc@161:                                                       val t = case to of
adamc@161:                                                                   NONE => t
adamc@161:                                                                 | SOME t' => (L'.TFun (t', t), loc)
adamc@191: 
adamc@191:                                                       val t = foldr (fn (x, t) =>
adamc@191:                                                                         (L'.TCFun (L'.Implicit, x, k, t), loc))
adamc@191:                                                               t xs
adamc@161:                                                   in
adamc@161:                                                       E.pushENamedAs env x n t
adamc@161:                                                   end) env xncs
adamc@161:                           in
adamc@191:                               ([(L'.SgiDatatypeImp (x, n', n, ms, s, xs, xncs), loc)], (env, denv, gs))
adamc@161:                           end)
adamc@161:                    | _ => (strError env (NotDatatype loc);
adamc@161:                            ([], (env, denv, [])))
adamc@158:              end)
adamc@156: 
adamc@76:       | L.SgiVal (x, c) =>
adamc@76:         let
adamc@83:             val (c', ck, gs') = elabCon (env, denv) c
adamc@31: 
adamc@76:             val (env', n) = E.pushENamed env x c'
adamc@467:             val c' = normClassConstraint env c'
adamc@76:         in
adamc@76:             (unifyKinds ck ktype
adamc@76:              handle KUnify ue => strError env (NotType (ck, ue)));
adamc@31: 
adamc@467:             ([(L'.SgiVal (x, n, c'), loc)], (env', denv, gs' @ gs))
adamc@76:         end
adamc@31: 
adamc@76:       | L.SgiStr (x, sgn) =>
adamc@76:         let
adamc@83:             val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76:             val (env', n) = E.pushStrNamed env x sgn'
adamc@76:         in
adamc@88:             ([(L'.SgiStr (x, n, sgn'), loc)], (env', denv, gs' @ gs))
adamc@76:         end
adamc@31: 
adamc@76:       | L.SgiSgn (x, sgn) =>
adamc@76:         let
adamc@83:             val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76:             val (env', n) = E.pushSgnNamed env x sgn'
adamc@76:         in
adamc@88:             ([(L'.SgiSgn (x, n, sgn'), loc)], (env', denv, gs' @ gs))
adamc@76:         end
adamc@31: 
adamc@76:       | L.SgiInclude sgn =>
adamc@76:         let
adamc@83:             val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76:         in
adamc@76:             case #1 (hnormSgn env sgn') of
adamc@76:                 L'.SgnConst sgis =>
adamc@88:                 (sgis, (foldl (fn (sgi, env) => E.sgiBinds env sgi) env sgis, denv, gs' @ gs))
adamc@76:               | _ => (sgnError env (NotIncludable sgn');
adamc@88:                       ([], (env, denv, [])))
adamc@88:         end
adamc@88: 
adamc@88:       | L.SgiConstraint (c1, c2) =>
adamc@88:         let
adamc@88:             val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@88:             val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@88: 
adamc@90:             val (denv, gs3) = D.assert env denv (c1', c2')
adamc@88:         in
adamc@88:             checkKind env c1' k1 (L'.KRecord (kunif loc), loc);
adamc@88:             checkKind env c2' k2 (L'.KRecord (kunif loc), loc);
adamc@88: 
adamc@90:             ([(L'.SgiConstraint (c1', c2'), loc)], (env, denv, gs1 @ gs2 @ gs3))
adamc@76:         end
adamc@31: 
adamc@211:       | L.SgiClassAbs x =>
adamc@211:         let
adamc@211:             val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211:             val (env, n) = E.pushCNamed env x k NONE
adamc@211:             val env = E.pushClass env n
adamc@211:         in
adamc@211:             ([(L'.SgiClassAbs (x, n), loc)], (env, denv, []))
adamc@211:         end
adamc@211: 
adamc@211:       | L.SgiClass (x, c) =>
adamc@211:         let
adamc@211:             val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211:             val (c', ck, gs) = elabCon (env, denv) c
adamc@211:             val (env, n) = E.pushCNamed env x k (SOME c')
adamc@211:             val env = E.pushClass env n
adamc@211:         in
adamc@211:             checkKind env c' ck k;
adamc@211:             ([(L'.SgiClass (x, n, c'), loc)], (env, denv, []))
adamc@211:         end
adamc@211: 
adamc@83: and elabSgn (env, denv) (sgn, loc) =
adamc@31:     case sgn of
adamc@31:         L.SgnConst sgis =>
adamc@31:         let
adamc@88:             val (sgis', (_, _, gs)) = ListUtil.foldlMapConcat elabSgn_item (env, denv, []) sgis
adamc@62: 
adamc@62:             val _ = foldl (fn ((sgi, loc), (cons, vals, sgns, strs)) =>
adamc@62:                               case sgi of
adamc@62:                                   L'.SgiConAbs (x, _, _) =>
adamc@62:                                   (if SS.member (cons, x) then
adamc@62:                                        sgnError env (DuplicateCon (loc, x))
adamc@62:                                    else
adamc@62:                                        ();
adamc@62:                                    (SS.add (cons, x), vals, sgns, strs))
adamc@62:                                 | L'.SgiCon (x, _, _, _) =>
adamc@62:                                   (if SS.member (cons, x) then
adamc@62:                                        sgnError env (DuplicateCon (loc, x))
adamc@62:                                    else
adamc@62:                                        ();
adamc@62:                                    (SS.add (cons, x), vals, sgns, strs))
adamc@191:                                 | L'.SgiDatatype (x, _, _, xncs) =>
adamc@156:                                   let
adamc@156:                                       val vals = foldl (fn ((x, _, _), vals) =>
adamc@156:                                                            (if SS.member (vals, x) then
adamc@156:                                                                 sgnError env (DuplicateVal (loc, x))
adamc@156:                                                             else
adamc@156:                                                                 ();
adamc@156:                                                             SS.add (vals, x)))
adamc@156:                                                        vals xncs
adamc@156:                                   in
adamc@156:                                       if SS.member (cons, x) then
adamc@156:                                           sgnError env (DuplicateCon (loc, x))
adamc@156:                                       else
adamc@156:                                           ();
adamc@156:                                       (SS.add (cons, x), vals, sgns, strs)
adamc@156:                                   end
adamc@191:                                 | L'.SgiDatatypeImp (x, _, _, _, _, _, _) =>
adamc@156:                                   (if SS.member (cons, x) then
adamc@156:                                        sgnError env (DuplicateCon (loc, x))
adamc@156:                                    else
adamc@156:                                        ();
adamc@156:                                    (SS.add (cons, x), vals, sgns, strs))
adamc@62:                                 | L'.SgiVal (x, _, _) =>
adamc@62:                                   (if SS.member (vals, x) then
adamc@62:                                        sgnError env (DuplicateVal (loc, x))
adamc@62:                                    else
adamc@62:                                        ();
adamc@62:                                    (cons, SS.add (vals, x), sgns, strs))
adamc@62:                                 | L'.SgiSgn (x, _, _) =>
adamc@62:                                   (if SS.member (sgns, x) then
adamc@62:                                        sgnError env (DuplicateSgn (loc, x))
adamc@62:                                    else
adamc@62:                                        ();
adamc@62:                                    (cons, vals, SS.add (sgns, x), strs))
adamc@62:                                 | L'.SgiStr (x, _, _) =>
adamc@62:                                   (if SS.member (strs, x) then
adamc@62:                                        sgnError env (DuplicateStr (loc, x))
adamc@62:                                    else
adamc@62:                                        ();
adamc@88:                                    (cons, vals, sgns, SS.add (strs, x)))
adamc@203:                                 | L'.SgiConstraint _ => (cons, vals, sgns, strs)
adamc@211:                                 | L'.SgiClassAbs (x, _) =>
adamc@211:                                   (if SS.member (cons, x) then
adamc@211:                                        sgnError env (DuplicateCon (loc, x))
adamc@211:                                    else
adamc@211:                                        ();
adamc@211:                                    (SS.add (cons, x), vals, sgns, strs))
adamc@211:                                 | L'.SgiClass (x, _, _) =>
adamc@211:                                   (if SS.member (cons, x) then
adamc@211:                                        sgnError env (DuplicateCon (loc, x))
adamc@211:                                    else
adamc@211:                                        ();
adamc@460:                                    (SS.add (cons, x), vals, sgns, strs)))
adamc@62:                     (SS.empty, SS.empty, SS.empty, SS.empty) sgis'
adamc@31:         in
adamc@83:             ((L'.SgnConst sgis', loc), gs)
adamc@31:         end
adamc@31:       | L.SgnVar x =>
adamc@31:         (case E.lookupSgn env x of
adamc@31:              NONE =>
adamc@31:              (sgnError env (UnboundSgn (loc, x));
adamc@83:               ((L'.SgnError, loc), []))
adamc@83:            | SOME (n, sgis) => ((L'.SgnVar n, loc), []))
adamc@41:       | L.SgnFun (m, dom, ran) =>
adamc@41:         let
adamc@83:             val (dom', gs1) = elabSgn (env, denv) dom
adamc@41:             val (env', n) = E.pushStrNamed env m dom'
adamc@83:             val (ran', gs2) = elabSgn (env', denv) ran
adamc@41:         in
adamc@83:             ((L'.SgnFun (m, n, dom', ran'), loc), gs1 @ gs2)
adamc@41:         end
adamc@42:       | L.SgnWhere (sgn, x, c) =>
adamc@42:         let
adamc@83:             val (sgn', ds1) = elabSgn (env, denv) sgn
adamc@83:             val (c', ck, ds2) = elabCon (env, denv) c
adamc@42:         in
adamc@42:             case #1 (hnormSgn env sgn') of
adamc@83:                 L'.SgnError => (sgnerror, [])
adamc@42:               | L'.SgnConst sgis =>
adamc@75:                 if List.exists (fn (L'.SgiConAbs (x', _, k), _) =>
adamc@75:                                    x' = x andalso
adamc@75:                                    (unifyKinds k ck
adamc@75:                                     handle KUnify x => sgnError env (WhereWrongKind x);
adamc@42:                                     true)
adamc@42:                                  | _ => false) sgis then
adamc@83:                     ((L'.SgnWhere (sgn', x, c'), loc), ds1 @ ds2)
adamc@42:                 else
adamc@42:                     (sgnError env (UnWhereable (sgn', x));
adamc@83:                      (sgnerror, []))
adamc@42:               | _ => (sgnError env (UnWhereable (sgn', x));
adamc@83:                       (sgnerror, []))
adamc@42:         end
adamc@59:       | L.SgnProj (m, ms, x) =>
adamc@59:         (case E.lookupStr env m of
adamc@59:              NONE => (strError env (UnboundStr (loc, m));
adamc@83:                       (sgnerror, []))
adamc@59:            | SOME (n, sgn) =>
adamc@59:              let
adamc@59:                  val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@59:                                           case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@59:                                               NONE => (strError env (UnboundStr (loc, m));
adamc@59:                                                        (strerror, sgnerror))
adamc@59:                                             | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@59:                                 ((L'.StrVar n, loc), sgn) ms
adamc@59:              in
adamc@59:                  case E.projectSgn env {sgn = sgn, str = str, field = x} of
adamc@59:                      NONE => (sgnError env (UnboundSgn (loc, x));
adamc@83:                               (sgnerror, []))
adamc@83:                    | SOME _ => ((L'.SgnProj (n, ms, x), loc), [])
adamc@59:              end)
adamc@59:                                                               
adamc@31: 
adamc@66: fun selfify env {str, strs, sgn} =
adamc@66:     case #1 (hnormSgn env sgn) of
adamc@66:         L'.SgnError => sgn
adamc@66:       | L'.SgnVar _ => sgn
adamc@66: 
adamc@66:       | L'.SgnConst sgis =>
adamc@66:         (L'.SgnConst (map (fn (L'.SgiConAbs (x, n, k), loc) =>
adamc@66:                               (L'.SgiCon (x, n, k, (L'.CModProj (str, strs, x), loc)), loc)
adamc@191:                             | (L'.SgiDatatype (x, n, xs, xncs), loc) =>
adamc@191:                               (L'.SgiDatatypeImp (x, n, str, strs, x, xs, xncs), loc)
adamc@218:                             | (L'.SgiClassAbs (x, n), loc) =>
adamc@218:                               (L'.SgiClass (x, n, (L'.CModProj (str, strs, x), loc)), loc)
adamc@66:                             | (L'.SgiStr (x, n, sgn), loc) =>
adamc@66:                               (L'.SgiStr (x, n, selfify env {str = str, strs = strs @ [x], sgn = sgn}), loc)
adamc@66:                             | x => x) sgis), #2 sgn)
adamc@66:       | L'.SgnFun _ => sgn
adamc@66:       | L'.SgnWhere _ => sgn
adamc@66:       | L'.SgnProj (m, ms, x) =>
adamc@66:         case E.projectSgn env {str = foldl (fn (m, str) => (L'.StrProj (str, m), #2 sgn))
adamc@66:                                            (L'.StrVar m, #2 sgn) ms,
adamc@66:                                sgn = #2 (E.lookupStrNamed env m),
adamc@66:                                field = x} of
adamc@66:             NONE => raise Fail "Elaborate.selfify: projectSgn returns NONE"
adamc@66:           | SOME sgn => selfify env {str = str, strs = strs, sgn = sgn}
adamc@66: 
adamc@66: fun selfifyAt env {str, sgn} =
adamc@66:     let
adamc@66:         fun self (str, _) =
adamc@66:             case str of
adamc@66:                 L'.StrVar x => SOME (x, [])
adamc@66:               | L'.StrProj (str, x) =>
adamc@66:                 (case self str of
adamc@66:                      NONE => NONE
adamc@66:                    | SOME (m, ms) => SOME (m, ms @ [x]))
adamc@66:               | _ => NONE
adamc@66:     in
adamc@66:         case self str of
adamc@66:             NONE => sgn
adamc@66:           | SOME (str, strs) => selfify env {sgn = sgn, str = str, strs = strs}
adamc@66:     end
adamc@66: 
adamc@88: fun dopen (env, denv) {str, strs, sgn} =
adamc@66:     let
adamc@66:         val m = foldl (fn (m, str) => (L'.StrProj (str, m), #2 sgn))
adamc@66:                 (L'.StrVar str, #2 sgn) strs
adamc@66:     in
adamc@66:         case #1 (hnormSgn env sgn) of
adamc@66:             L'.SgnConst sgis =>
adamc@88:             ListUtil.foldlMap (fn ((sgi, loc), (env', denv')) =>
adamc@162:                                   let
adamc@162:                                       val d =
adamc@162:                                           case sgi of
adamc@162:                                               L'.SgiConAbs (x, n, k) =>
adamc@162:                                               let
adamc@162:                                                   val c = (L'.CModProj (str, strs, x), loc)
adamc@162:                                               in
adamc@162:                                                   (L'.DCon (x, n, k, c), loc)
adamc@162:                                               end
adamc@162:                                             | L'.SgiCon (x, n, k, c) =>
adamc@162:                                               (L'.DCon (x, n, k, (L'.CModProj (str, strs, x), loc)), loc)
adamc@191:                                             | L'.SgiDatatype (x, n, xs, xncs) =>
adamc@191:                                               (L'.DDatatypeImp (x, n, str, strs, x, xs, xncs), loc)
adamc@191:                                             | L'.SgiDatatypeImp (x, n, m1, ms, x', xs, xncs) =>
adamc@191:                                               (L'.DDatatypeImp (x, n, m1, ms, x', xs, xncs), loc)
adamc@162:                                             | L'.SgiVal (x, n, t) =>
adamc@162:                                               (L'.DVal (x, n, t, (L'.EModProj (str, strs, x), loc)), loc)
adamc@162:                                             | L'.SgiStr (x, n, sgn) =>
adamc@162:                                               (L'.DStr (x, n, sgn, (L'.StrProj (m, x), loc)), loc)
adamc@162:                                             | L'.SgiSgn (x, n, sgn) =>
adamc@162:                                               (L'.DSgn (x, n, (L'.SgnProj (str, strs, x), loc)), loc)
adamc@162:                                             | L'.SgiConstraint (c1, c2) =>
adamc@162:                                               (L'.DConstraint (c1, c2), loc)
adamc@211:                                             | L'.SgiClassAbs (x, n) =>
adamc@211:                                               let
adamc@211:                                                   val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211:                                                   val c = (L'.CModProj (str, strs, x), loc)
adamc@211:                                               in
adamc@211:                                                   (L'.DCon (x, n, k, c), loc)
adamc@211:                                               end
adamc@211:                                             | L'.SgiClass (x, n, _) =>
adamc@211:                                               let
adamc@211:                                                   val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211:                                                   val c = (L'.CModProj (str, strs, x), loc)
adamc@211:                                               in
adamc@211:                                                   (L'.DCon (x, n, k, c), loc)
adamc@211:                                               end
adamc@162:                                   in
adamc@162:                                       (d, (E.declBinds env' d, denv'))
adamc@162:                                   end)
adamc@88:                               (env, denv) sgis
adamc@66:           | _ => (strError env (UnOpenable sgn);
adamc@88:                   ([], (env, denv)))
adamc@66:     end
adamc@66: 
adamc@88: fun dopenConstraints (loc, env, denv) {str, strs} =
adamc@88:     case E.lookupStr env str of
adamc@88:         NONE => (strError env (UnboundStr (loc, str));
adamc@88:                  denv)
adamc@88:       | SOME (n, sgn) =>
adamc@88:         let
adamc@88:             val (st, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@88:                                       case E.projectStr env {str = str, sgn = sgn, field = m} of
adamc@88:                                           NONE => (strError env (UnboundStr (loc, m));
adamc@88:                                                    (strerror, sgnerror))
adamc@88:                                         | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@88:                                   ((L'.StrVar n, loc), sgn) strs
adamc@88:                             
adamc@88:             val cso = E.projectConstraints env {sgn = sgn, str = st}
adamc@88: 
adamc@88:             val denv = case cso of
adamc@88:                            NONE => (strError env (UnboundStr (loc, str));
adamc@88:                                     denv)
adamc@90:                          | SOME cs => foldl (fn ((c1, c2), denv) =>
adamc@90:                                                 let
adamc@90:                                                     val (denv, gs) = D.assert env denv (c1, c2)
adamc@90:                                                 in
adamc@90:                                                     case gs of
adamc@90:                                                         [] => ()
adamc@90:                                                       | _ => raise Fail "dopenConstraints: Sub-constraints remain";
adamc@90: 
adamc@90:                                                     denv
adamc@90:                                                 end) denv cs
adamc@88:         in
adamc@88:             denv
adamc@88:         end
adamc@88: 
adamc@31: fun sgiOfDecl (d, loc) =
adamc@31:     case d of
adamc@123:         L'.DCon (x, n, k, c) => [(L'.SgiCon (x, n, k, c), loc)]
adamc@156:       | L'.DDatatype x => [(L'.SgiDatatype x, loc)]
adamc@156:       | L'.DDatatypeImp x => [(L'.SgiDatatypeImp x, loc)]
adamc@123:       | L'.DVal (x, n, t, _) => [(L'.SgiVal (x, n, t), loc)]
adamc@123:       | L'.DValRec vis => map (fn (x, n, t, _) => (L'.SgiVal (x, n, t), loc)) vis
adamc@123:       | L'.DSgn (x, n, sgn) => [(L'.SgiSgn (x, n, sgn), loc)]
adamc@123:       | L'.DStr (x, n, sgn, _) => [(L'.SgiStr (x, n, sgn), loc)]
adamc@123:       | L'.DFfiStr (x, n, sgn) => [(L'.SgiStr (x, n, sgn), loc)]
adamc@123:       | L'.DConstraint cs => [(L'.SgiConstraint cs, loc)]
adamc@123:       | L'.DExport _ => []
adamc@460:       | L'.DTable (tn, x, n, c) => [(L'.SgiVal (x, n, (L'.CApp (tableOf (), c), loc)), loc)]
adamc@460:       | L'.DSequence (tn, x, n) => [(L'.SgiVal (x, n, sequenceOf ()), loc)]
adamc@213:       | L'.DClass (x, n, c) => [(L'.SgiClass (x, n, c), loc)]
adamc@271:       | L'.DDatabase _ => []
adamc@460:       | L'.DCookie (tn, x, n, c) => [(L'.SgiVal (x, n, (L'.CApp (cookieOf (), c), loc)), loc)]
adamc@88: 
adamc@88: fun sgiBindsD (env, denv) (sgi, _) =
adamc@88:     case sgi of
adamc@90:         L'.SgiConstraint (c1, c2) =>
adamc@90:         (case D.assert env denv (c1, c2) of
adamc@90:              (denv, []) => denv
adamc@90:            | _ => raise Fail "sgiBindsD: Sub-constraints remain")
adamc@88:       | _ => denv
adamc@31: 
adamc@86: fun subSgn (env, denv) sgn1 (sgn2 as (_, loc2)) =
adamc@35:     case (#1 (hnormSgn env sgn1), #1 (hnormSgn env sgn2)) of
adamc@31:         (L'.SgnError, _) => ()
adamc@31:       | (_, L'.SgnError) => ()
adamc@31: 
adamc@31:       | (L'.SgnConst sgis1, L'.SgnConst sgis2) =>
adamc@31:         let
adamc@362:             (*val () = prefaces "subSgn" [("sgn1", p_sgn env sgn1),
adamc@362:                                         ("sgn2", p_sgn env sgn2),
adamc@362:                                         ("sgis1", p_sgn env (L'.SgnConst sgis1, loc2)),
adamc@362:                                         ("sgis2", p_sgn env (L'.SgnConst sgis2, loc2))]*)
adamc@362: 
adamc@156:             fun folder (sgi2All as (sgi, loc), (env, denv)) =
adamc@31:                 let
adamc@362:                     (*val () = prefaces "folder" [("sgis1", p_sgn env (L'.SgnConst sgis1, loc2))]*)
adamc@362: 
adamc@31:                     fun seek p =
adamc@31:                         let
adamc@88:                             fun seek (env, denv) ls =
adamc@31:                                 case ls of
adamc@31:                                     [] => (sgnError env (UnmatchedSgi sgi2All);
adamc@88:                                            (env, denv))
adamc@31:                                   | h :: t =>
adamc@31:                                     case p h of
adamc@88:                                         NONE => seek (E.sgiBinds env h, sgiBindsD (env, denv) h) t
adamc@88:                                       | SOME envs => envs
adamc@31:                         in
adamc@88:                             seek (env, denv) sgis1
adamc@31:                         end
adamc@31:                 in
adamc@31:                     case sgi of
adamc@31:                         L'.SgiConAbs (x, n2, k2) =>
adamc@31:                         seek (fn sgi1All as (sgi1, _) =>
adamc@31:                                  let
adamc@41:                                      fun found (x', n1, k1, co1) =
adamc@41:                                          if x = x' then
adamc@41:                                              let
adamc@41:                                                  val () = unifyKinds k1 k2
adamc@41:                                                      handle KUnify (k1, k2, err) =>
adamc@41:                                                             sgnError env (SgiWrongKind (sgi1All, k1, sgi2All, k2, err))
adamc@41:                                                  val env = E.pushCNamedAs env x n1 k1 co1
adamc@41:                                              in
adamc@41:                                                  SOME (if n1 = n2 then
adamc@41:                                                            env
adamc@41:                                                        else
adamc@88:                                                            E.pushCNamedAs env x n2 k2 (SOME (L'.CNamed n1, loc2)),
adamc@88:                                                        denv)
adamc@41:                                              end
adamc@41:                                          else
adamc@41:                                              NONE
adamc@31:                                  in
adamc@31:                                      case sgi1 of
adamc@41:                                          L'.SgiConAbs (x', n1, k1) => found (x', n1, k1, NONE)
adamc@41:                                        | L'.SgiCon (x', n1, k1, c1) => found (x', n1, k1, SOME c1)
adamc@191:                                        | L'.SgiDatatype (x', n1, xs, _) =>
adamc@191:                                          let
adamc@191:                                              val k = (L'.KType, loc)
adamc@191:                                              val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191:                                          in
adamc@191:                                              found (x', n1, k', NONE)
adamc@191:                                          end
adamc@191:                                        | L'.SgiDatatypeImp (x', n1, m1, ms, s, xs, _) =>
adamc@191:                                          let
adamc@191:                                              val k = (L'.KType, loc)
adamc@191:                                              val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@191:                                          in
adamc@191:                                              found (x', n1, k', SOME (L'.CModProj (m1, ms, s), loc))
adamc@191:                                          end
adamc@211:                                        | L'.SgiClassAbs (x', n1) => found (x', n1,
adamc@218:                                                                            (L'.KArrow ((L'.KType, loc),
adamc@218:                                                                                        (L'.KType, loc)), loc),
adamc@218:                                                                            NONE)
adamc@211:                                        | L'.SgiClass (x', n1, c) => found (x', n1,
adamc@211:                                                                            (L'.KArrow ((L'.KType, loc),
adamc@211:                                                                                        (L'.KType, loc)), loc),
adamc@211:                                                                            SOME c)
adamc@31:                                        | _ => NONE
adamc@31:                                  end)
adamc@31: 
adamc@31:                       | L'.SgiCon (x, n2, k2, c2) =>
adamc@31:                         seek (fn sgi1All as (sgi1, _) =>
adamc@211:                                  let
adamc@211:                                      fun found (x', n1, k1, c1) =
adamc@211:                                          if x = x' then
adamc@211:                                              let
adamc@327:                                                  fun good () =
adamc@327:                                                      let
adamc@327:                                                          val env = E.pushCNamedAs env x n2 k2 (SOME c2)
adamc@327:                                                          val env = if n1 = n2 then
adamc@327:                                                                        env
adamc@327:                                                                    else
adamc@327:                                                                        E.pushCNamedAs env x n1 k1 (SOME c1)
adamc@327:                                                      in
adamc@327:                                                          SOME (env, denv)
adamc@327:                                                      end
adamc@211:                                              in
adamc@211:                                                  (case unifyCons (env, denv) c1 c2 of
adamc@211:                                                       [] => good ()
adamc@211:                                                     | _ => NONE)
adamc@211:                                                  handle CUnify (c1, c2, err) =>
adamc@211:                                                         (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@211:                                                          good ())
adamc@211:                                              end
adamc@211:                                          else
adamc@211:                                              NONE
adamc@211:                                  in
adamc@211:                                      case sgi1 of
adamc@211:                                          L'.SgiCon (x', n1, k1, c1) => found (x', n1, k1, c1)
adamc@211:                                        | L'.SgiClass (x', n1, c1) =>
adamc@211:                                          found (x', n1, (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc), c1)
adamc@211:                                        | _ => NONE
adamc@211:                                  end)
adamc@31: 
adamc@191:                       | L'.SgiDatatype (x, n2, xs2, xncs2) =>
adamc@156:                         seek (fn sgi1All as (sgi1, _) =>
adamc@160:                                  let
adamc@191:                                      fun found (n1, xs1, xncs1) =
adamc@160:                                          let
adamc@160:                                              fun mismatched ue =
adamc@160:                                                  (sgnError env (SgiMismatchedDatatypes (sgi1All, sgi2All, ue));
adamc@160:                                                   SOME (env, denv))
adamc@156: 
adamc@191:                                              val k = (L'.KType, loc)
adamc@191:                                              val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs1
adamc@191: 
adamc@160:                                              fun good () =
adamc@160:                                                  let
adamc@160:                                                      val env = E.sgiBinds env sgi2All
adamc@160:                                                      val env = if n1 = n2 then
adamc@160:                                                                    env
adamc@160:                                                                else
adamc@413:                                                                    E.pushCNamedAs env x n1 k'
adamc@397:                                                                                   (SOME (L'.CNamed n2, loc))
adamc@160:                                                  in
adamc@160:                                                      SOME (env, denv)
adamc@160:                                                  end
adamc@156: 
adamc@397:                                              val env = E.pushCNamedAs env x n1 k' NONE
adamc@397:                                              val env = if n1 = n2 then
adamc@397:                                                            env
adamc@397:                                                        else
adamc@397:                                                            E.pushCNamedAs env x n2 k' (SOME (L'.CNamed n1, loc))
adamc@191:                                              val env = foldl (fn (x, env) => E.pushCRel env x k) env xs1
adamc@160:                                              fun xncBad ((x1, _, t1), (x2, _, t2)) =
adamc@160:                                                  String.compare (x1, x2) <> EQUAL
adamc@160:                                                  orelse case (t1, t2) of
adamc@160:                                                             (NONE, NONE) => false
adamc@160:                                                           | (SOME t1, SOME t2) =>
adamc@160:                                                             not (List.null (unifyCons (env, denv) t1 t2))
adamc@160:                                                           | _ => true
adamc@160:                                          in
adamc@191:                                              (if xs1 <> xs2
adamc@191:                                                  orelse length xncs1 <> length xncs2
adamc@160:                                                  orelse ListPair.exists xncBad (xncs1, xncs2) then
adamc@160:                                                   mismatched NONE
adamc@160:                                               else
adamc@160:                                                   good ())
adamc@160:                                              handle CUnify ue => mismatched (SOME ue)
adamc@160:                                          end
adamc@160:                                  in
adamc@160:                                      case sgi1 of
adamc@191:                                          L'.SgiDatatype (x', n1, xs, xncs1) =>
adamc@160:                                          if x' = x then
adamc@191:                                              found (n1, xs, xncs1)
adamc@160:                                          else
adamc@160:                                              NONE
adamc@191:                                        | L'.SgiDatatypeImp (x', n1, _, _, _, xs, xncs1) =>
adamc@162:                                          if x' = x then
adamc@191:                                              found (n1, xs, xncs1)
adamc@162:                                          else
adamc@162:                                              NONE
adamc@160:                                        | _ => NONE
adamc@160:                                  end)
adamc@156: 
adamc@191:                       | L'.SgiDatatypeImp (x, n2, m12, ms2, s2, xs, _) =>
adamc@158:                         seek (fn sgi1All as (sgi1, _) =>
adamc@158:                                  case sgi1 of
adamc@191:                                      L'.SgiDatatypeImp (x', n1, m11, ms1, s1, _, _) =>
adamc@158:                                      if x = x' then
adamc@158:                                          let
adamc@158:                                              val k = (L'.KType, loc)
adamc@191:                                              val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@158:                                              val t1 = (L'.CModProj (m11, ms1, s1), loc)
adamc@158:                                              val t2 = (L'.CModProj (m12, ms2, s2), loc)
adamc@158: 
adamc@158:                                              fun good () =
adamc@158:                                                  let
adamc@191:                                                      val env = E.pushCNamedAs env x n1 k' (SOME t1)
adamc@191:                                                      val env = E.pushCNamedAs env x n2 k' (SOME t2)
adamc@158:                                                  in
adamc@158:                                                      SOME (env, denv)
adamc@158:                                                  end
adamc@158:                                          in
adamc@158:                                              (case unifyCons (env, denv) t1 t2 of
adamc@158:                                                   [] => good ()
adamc@158:                                                 | _ => NONE)
adamc@158:                                              handle CUnify (c1, c2, err) =>
adamc@158:                                                     (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@158:                                                      good ())
adamc@158:                                          end
adamc@158:                                      else
adamc@158:                                          NONE
adamc@158: 
adamc@158:                                    | _ => NONE)
adamc@156: 
adamc@32:                       | L'.SgiVal (x, n2, c2) =>
adamc@32:                         seek (fn sgi1All as (sgi1, _) =>
adamc@32:                                  case sgi1 of
adamc@41:                                      L'.SgiVal (x', n1, c1) =>
adamc@41:                                      if x = x' then
adamc@362:                                          ((*prefaces "Pre" [("c1", p_con env c1),
adamc@362:                                                           ("c2", p_con env c2)];*)
adamc@362:                                           case unifyCons (env, denv) c1 c2 of
adamc@88:                                               [] => SOME (env, denv)
adamc@86:                                             | _ => NONE)
adamc@86:                                          handle CUnify (c1, c2, err) =>
adamc@86:                                                 (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@88:                                                  SOME (env, denv))
adamc@41:                                      else
adamc@41:                                          NONE
adamc@32:                                    | _ => NONE)
adamc@32: 
adamc@33:                       | L'.SgiStr (x, n2, sgn2) =>
adamc@33:                         seek (fn sgi1All as (sgi1, _) =>
adamc@33:                                  case sgi1 of
adamc@41:                                      L'.SgiStr (x', n1, sgn1) =>
adamc@41:                                      if x = x' then
adamc@66:                                          let
adamc@86:                                              val () = subSgn (env, denv) sgn1 sgn2
adamc@66:                                              val env = E.pushStrNamedAs env x n1 sgn1
adamc@66:                                              val env = if n1 = n2 then
adamc@66:                                                            env
adamc@66:                                                        else
adamc@66:                                                            E.pushStrNamedAs env x n2
adamc@66:                                                                             (selfifyAt env {str = (L'.StrVar n1, #2 sgn2),
adamc@66:                                                                                             sgn = sgn2})
adamc@66:                                          in
adamc@88:                                              SOME (env, denv)
adamc@66:                                          end
adamc@41:                                      else
adamc@41:                                          NONE
adamc@33:                                    | _ => NONE)
adamc@59: 
adamc@59:                       | L'.SgiSgn (x, n2, sgn2) =>
adamc@59:                         seek (fn sgi1All as (sgi1, _) =>
adamc@59:                                  case sgi1 of
adamc@59:                                      L'.SgiSgn (x', n1, sgn1) =>
adamc@59:                                      if x = x' then
adamc@65:                                          let
adamc@86:                                              val () = subSgn (env, denv) sgn1 sgn2
adamc@86:                                              val () = subSgn (env, denv) sgn2 sgn1
adamc@65: 
adamc@65:                                              val env = E.pushSgnNamedAs env x n2 sgn2
adamc@65:                                              val env = if n1 = n2 then
adamc@65:                                                            env
adamc@65:                                                        else
adamc@65:                                                            E.pushSgnNamedAs env x n1 sgn2
adamc@65:                                          in
adamc@88:                                              SOME (env, denv)
adamc@65:                                          end
adamc@59:                                      else
adamc@59:                                          NONE
adamc@59:                                    | _ => NONE)
adamc@88: 
adamc@88:                       | L'.SgiConstraint (c2, d2) =>
adamc@88:                         seek (fn sgi1All as (sgi1, _) =>
adamc@88:                                  case sgi1 of
adamc@88:                                      L'.SgiConstraint (c1, d1) =>
adamc@88:                                      if consEq (env, denv) (c1, c2) andalso consEq (env, denv) (d1, d2) then
adamc@90:                                          let
adamc@90:                                              val (denv, gs) = D.assert env denv (c2, d2)
adamc@90:                                          in
adamc@90:                                              case gs of
adamc@90:                                                  [] => ()
adamc@90:                                                | _ => raise Fail "subSgn: Sub-constraints remain";
adamc@90: 
adamc@90:                                              SOME (env, denv)
adamc@90:                                          end
adamc@88:                                      else
adamc@88:                                          NONE
adamc@88:                                    | _ => NONE)
adamc@203: 
adamc@211:                       | L'.SgiClassAbs (x, n2) =>
adamc@211:                         seek (fn sgi1All as (sgi1, _) =>
adamc@211:                                  let
adamc@211:                                      fun found (x', n1, co) =
adamc@211:                                          if x = x' then
adamc@211:                                              let
adamc@211:                                                  val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211:                                                  val env = E.pushCNamedAs env x n1 k co
adamc@211:                                              in
adamc@211:                                                  SOME (if n1 = n2 then
adamc@211:                                                            env
adamc@211:                                                        else
adamc@211:                                                            E.pushCNamedAs env x n2 k (SOME (L'.CNamed n1, loc2)),
adamc@211:                                                        denv)
adamc@211:                                              end
adamc@211:                                          else
adamc@211:                                              NONE
adamc@211:                                  in
adamc@211:                                      case sgi1 of
adamc@211:                                          L'.SgiClassAbs (x', n1) => found (x', n1, NONE)
adamc@211:                                        | L'.SgiClass (x', n1, c) => found (x', n1, SOME c)
adamc@211:                                        | _ => NONE
adamc@211:                                  end)
adamc@211:                       | L'.SgiClass (x, n2, c2) =>
adamc@211:                         seek (fn sgi1All as (sgi1, _) =>
adamc@211:                                  let
adamc@211:                                      val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211: 
adamc@211:                                      fun found (x', n1, c1) =
adamc@211:                                          if x = x' then
adamc@211:                                              let
adamc@218:                                                  fun good () =
adamc@218:                                                      let
adamc@218:                                                          val env = E.pushCNamedAs env x n2 k (SOME c2)
adamc@218:                                                          val env = if n1 = n2 then
adamc@218:                                                                        env
adamc@218:                                                                    else
adamc@218:                                                                        E.pushCNamedAs env x n1 k (SOME c1)
adamc@218:                                                      in
adamc@218:                                                          SOME (env, denv)
adamc@218:                                                      end
adamc@211:                                              in
adamc@211:                                                  (case unifyCons (env, denv) c1 c2 of
adamc@211:                                                       [] => good ()
adamc@211:                                                     | _ => NONE)
adamc@211:                                                  handle CUnify (c1, c2, err) =>
adamc@211:                                                         (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@211:                                                          good ())
adamc@211:                                              end
adamc@211:                                          else
adamc@211:                                              NONE
adamc@211:                                  in
adamc@211:                                      case sgi1 of
adamc@211:                                          L'.SgiClass (x', n1, c1) => found (x', n1, c1)
adamc@211:                                        | _ => NONE
adamc@211:                                  end)
adamc@31:                 end
adamc@31:         in
adamc@88:             ignore (foldl folder (env, denv) sgis2)
adamc@31:         end
adamc@31: 
adamc@41:       | (L'.SgnFun (m1, n1, dom1, ran1), L'.SgnFun (m2, n2, dom2, ran2)) =>
adamc@43:         let
adamc@43:             val ran1 =
adamc@43:                 if n1 = n2 then
adamc@43:                     ran1
adamc@43:                 else
adamc@43:                     subStrInSgn (n1, n2) ran1
adamc@43:         in
adamc@86:             subSgn (env, denv) dom2 dom1;
adamc@86:             subSgn (E.pushStrNamedAs env m2 n2 dom2, denv) ran1 ran2
adamc@43:         end
adamc@41: 
adamc@41:       | _ => sgnError env (SgnWrongForm (sgn1, sgn2))
adamc@41: 
adamc@61: 
adamc@312: fun positive self =
adamc@312:     let
adamc@312:         open L
adamc@312: 
adamc@312:         fun none (c, _) =
adamc@312:             case c of
adamc@312:                 CAnnot (c, _) => none c
adamc@312: 
adamc@312:               | TFun (c1, c2) => none c1 andalso none c2
adamc@312:               | TCFun (_, _, _, c) => none c
adamc@312:               | TRecord c => none c
adamc@312: 
adamc@312:               | CVar ([], x) => x <> self
adamc@312:               | CVar _ => true
adamc@312:               | CApp (c1, c2) => none c1 andalso none c2
adamc@312:               | CAbs _ => false
adamc@312:               | CDisjoint (c1, c2, c3) => none c1 andalso none c2 andalso none c3
adamc@312: 
adamc@312:               | CName _ => true
adamc@312: 
adamc@312:               | CRecord xcs => List.all (fn (c1, c2) => none c1 andalso none c2) xcs
adamc@312:               | CConcat (c1, c2) => none c1 andalso none c2
adamc@312:               | CFold => true
adamc@312: 
adamc@312:               | CUnit => true
adamc@312: 
adamc@312:               | CTuple cs => List.all none cs
adamc@312:               | CProj (c, _) => none c
adamc@312: 
adamc@312:               | CWild _ => false                
adamc@312: 
adamc@312:         fun pos (c, _) =
adamc@312:             case c of
adamc@312:                 CAnnot (c, _) => pos c
adamc@312: 
adamc@312:               | TFun (c1, c2) => none c1 andalso pos c2
adamc@312:               | TCFun (_, _, _, c) => pos c
adamc@312:               | TRecord c => pos c
adamc@312: 
adamc@312:               | CVar _ => true
adamc@312:               | CApp (c1, c2) => pos c1 andalso none c2
adamc@312:               | CAbs _ => false
adamc@312:               | CDisjoint (c1, c2, c3) => none c1 andalso none c2 andalso none c3
adamc@312: 
adamc@312:               | CName _ => true
adamc@312: 
adamc@312:               | CRecord xcs => List.all (fn (c1, c2) => none c1 andalso pos c2) xcs
adamc@312:               | CConcat (c1, c2) => pos c1 andalso pos c2
adamc@312:               | CFold => true
adamc@312: 
adamc@312:               | CUnit => true
adamc@312: 
adamc@312:               | CTuple cs => List.all pos cs
adamc@312:               | CProj (c, _) => pos c
adamc@312: 
adamc@312:               | CWild _ => false
adamc@312:     in
adamc@312:         pos
adamc@312:     end
adamc@312: 
adamc@325: fun wildifyStr env (str, sgn) =
adamc@325:     case #1 (hnormSgn env sgn) of
adamc@325:         L'.SgnConst sgis =>
adamc@325:         (case #1 str of
adamc@325:              L.StrConst ds =>
adamc@325:              let
adamc@325:                  fun decompileCon env (c, loc) =
adamc@325:                      case c of
adamc@325:                          L'.CRel i =>
adamc@325:                          let
adamc@325:                              val (s, _) = E.lookupCRel env i
adamc@325:                          in
adamc@325:                              SOME (L.CVar ([], s), loc)
adamc@325:                          end
adamc@325:                        | L'.CNamed i =>
adamc@325:                          let
adamc@325:                              val (s, _, _) = E.lookupCNamed env i
adamc@325:                          in
adamc@325:                              SOME (L.CVar ([], s), loc)
adamc@325:                          end
adamc@325:                        | L'.CModProj (m1, ms, x) =>
adamc@325:                          let
adamc@325:                              val (s, _) = E.lookupStrNamed env m1
adamc@325:                          in
adamc@325:                              SOME (L.CVar (s :: ms, x), loc)
adamc@325:                          end
adamc@325:                        | L'.CName s => SOME (L.CName s, loc)
adamc@325:                        | L'.CRecord (_, xcs) =>
adamc@325:                          let
adamc@325:                              fun fields xcs =
adamc@325:                                  case xcs of
adamc@325:                                      [] => SOME []
adamc@325:                                    | (x, t) :: xcs =>
adamc@325:                                      case (decompileCon env x, decompileCon env t, fields xcs) of
adamc@325:                                          (SOME x, SOME t, SOME xcs) => SOME ((x, t) :: xcs)
adamc@325:                                        | _ => NONE
adamc@325:                          in
adamc@325:                              Option.map (fn xcs => (L.CRecord xcs, loc))
adamc@325:                              (fields xcs)
adamc@325:                          end
adamc@325:                        | L'.CConcat (c1, c2) =>
adamc@325:                          (case (decompileCon env c1, decompileCon env c2) of
adamc@325:                               (SOME c1, SOME c2) => SOME (L.CConcat (c1, c2), loc)
adamc@325:                             | _ => NONE)
adamc@325:                        | L'.CUnit => SOME (L.CUnit, loc)
adamc@325: 
adamc@325:                        | _ => NONE
adamc@325: 
adamc@325:                  val (needed, constraints, _) =
adamc@325:                      foldl (fn ((sgi, loc), (needed, constraints, env')) =>
adamc@325:                                let
adamc@325:                                    val (needed, constraints) =
adamc@325:                                        case sgi of
adamc@325:                                            L'.SgiConAbs (x, _, _) => (SS.add (needed, x), constraints)
adamc@325:                                          | L'.SgiConstraint cs => (needed, (env', cs, loc) :: constraints)
adamc@325:                                          | _ => (needed, constraints)
adamc@325:                                in
adamc@325:                                    (needed, constraints, E.sgiBinds env' (sgi, loc))
adamc@325:                                end)
adamc@325:                            (SS.empty, [], env) sgis
adamc@325:                                                               
adamc@325:                  val needed = foldl (fn ((d, _), needed) =>
adamc@325:                                         case d of
adamc@325:                                             L.DCon (x, _, _) => (SS.delete (needed, x)
adamc@325:                                                                  handle NotFound =>
adamc@325:                                                                         needed)
adamc@325:                                           | L.DClass (x, _) => (SS.delete (needed, x)
adamc@325:                                                                 handle NotFound => needed)
adamc@325:                                           | L.DOpen _ => SS.empty
adamc@325:                                           | _ => needed)
adamc@325:                                     needed ds
adamc@325: 
adamc@325:                  val cds = List.mapPartial (fn (env', (c1, c2), loc) =>
adamc@325:                                                case (decompileCon env' c1, decompileCon env' c2) of
adamc@325:                                                    (SOME c1, SOME c2) =>
adamc@325:                                                    SOME (L.DConstraint (c1, c2), loc)
adamc@325:                                                  | _ => NONE) constraints
adamc@325:              in
adamc@325:                  case SS.listItems needed of
adamc@325:                      [] => (L.StrConst (ds @ cds), #2 str)
adamc@325:                    | xs =>
adamc@325:                      let
adamc@325:                          val kwild = (L.KWild, #2 str)
adamc@325:                          val cwild = (L.CWild kwild, #2 str)
adamc@325:                          val ds' = map (fn x => (L.DCon (x, NONE, cwild), #2 str)) xs
adamc@325:                      in
adamc@325:                          (L.StrConst (ds @ ds' @ cds), #2 str)
adamc@325:                      end
adamc@325:              end
adamc@325:            | _ => str)
adamc@325:       | _ => str
adamc@325: 
adamc@280: fun elabDecl (dAll as (d, loc), (env, denv, gs : constraint list)) =
adamc@255:     let
adamc@255:         (*val () = preface ("elabDecl", SourcePrint.p_decl (d, loc))*)
adamc@255: 
adamc@255:         val r = 
adamc@255:             case d of
adamc@255:                 L.DCon (x, ko, c) =>
adamc@255:                 let
adamc@255:                     val k' = case ko of
adamc@255:                                  NONE => kunif loc
adamc@255:                                | SOME k => elabKind k
adamc@255: 
adamc@255:                     val (c', ck, gs') = elabCon (env, denv) c
adamc@255:                     val (env', n) = E.pushCNamed env x k' (SOME c')
adamc@255:                 in
adamc@255:                     checkKind env c' ck k';
adamc@255: 
adamc@255:                     ([(L'.DCon (x, n, k', c'), loc)], (env', denv, enD gs' @ gs))
adamc@255:                 end
adamc@255:               | L.DDatatype (x, xs, xcs) =>
adamc@255:                 let
adamc@312:                     val positive = List.all (fn (_, to) =>
adamc@312:                                                 case to of
adamc@312:                                                     NONE => true
adamc@312:                                                   | SOME t => positive x t) xcs
adamc@312: 
adamc@255:                     val k = (L'.KType, loc)
adamc@255:                     val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@255:                     val (env, n) = E.pushCNamed env x k' NONE
adamc@255:                     val t = (L'.CNamed n, loc)
adamc@255:                     val nxs = length xs - 1
adamc@255:                     val t = ListUtil.foldli (fn (i, _, t) => (L'.CApp (t, (L'.CRel (nxs - i), loc)), loc)) t xs
adamc@255: 
adamc@255:                     val (env', denv') = foldl (fn (x, (env', denv')) =>
adamc@255:                                                   (E.pushCRel env' x k,
adamc@255:                                                    D.enter denv')) (env, denv) xs
adamc@255: 
adamc@255:                     val (xcs, (used, env, gs')) =
adamc@255:                         ListUtil.foldlMap
adamc@255:                             (fn ((x, to), (used, env, gs)) =>
adamc@255:                                 let
adamc@255:                                     val (to, t, gs') = case to of
adamc@255:                                                            NONE => (NONE, t, gs)
adamc@255:                                                          | SOME t' =>
adamc@255:                                                            let
adamc@255:                                                                val (t', tk, gs') = elabCon (env', denv') t'
adamc@255:                                                            in
adamc@255:                                                                checkKind env' t' tk k;
adamc@255:                                                                (SOME t', (L'.TFun (t', t), loc), enD gs' @ gs)
adamc@255:                                                            end
adamc@255:                                     val t = foldr (fn (x, t) => (L'.TCFun (L'.Implicit, x, k, t), loc)) t xs
adamc@255: 
adamc@255:                                     val (env, n') = E.pushENamed env x t
adamc@255:                                 in
adamc@255:                                     if SS.member (used, x) then
adamc@255:                                         strError env (DuplicateConstructor (x, loc))
adamc@255:                                     else
adamc@255:                                         ();
adamc@255:                                     ((x, n', to), (SS.add (used, x), env, gs'))
adamc@255:                                 end)
adamc@255:                             (SS.empty, env, []) xcs
adamc@255: 
adamc@255:                     val env = E.pushDatatype env n xs xcs
adamc@312:                     val d' = (L'.DDatatype (x, n, xs, xcs), loc)
adamc@255:                 in
adamc@312:                     if positive then
adamc@312:                         ()
adamc@312:                     else
adamc@312:                         declError env (Nonpositive d');
adamc@312: 
adamc@312:                     ([d'], (env, denv, gs' @ gs))
adamc@255:                 end
adamc@255: 
adamc@255:               | L.DDatatypeImp (_, [], _) => raise Fail "Empty DDatatypeImp"
adamc@255: 
adamc@255:               | L.DDatatypeImp (x, m1 :: ms, s) =>
adamc@255:                 (case E.lookupStr env m1 of
adamc@255:                      NONE => (expError env (UnboundStrInExp (loc, m1));
adamc@255:                               ([], (env, denv, gs)))
adamc@255:                    | SOME (n, sgn) =>
adamc@255:                      let
adamc@255:                          val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@255:                                                     case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@255:                                                         NONE => (conError env (UnboundStrInCon (loc, m));
adamc@255:                                                                  (strerror, sgnerror))
adamc@255:                                                       | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@255:                                                 ((L'.StrVar n, loc), sgn) ms
adamc@255:                      in
adamc@255:                          case hnormCon (env, denv) (L'.CModProj (n, ms, s), loc) of
adamc@255:                              ((L'.CModProj (n, ms, s), _), gs') =>
adamc@255:                              (case E.projectDatatype env {sgn = sgn, str = str, field = s} of
adamc@255:                                   NONE => (conError env (UnboundDatatype (loc, s));
adamc@255:                                            ([], (env, denv, gs)))
adamc@255:                                 | SOME (xs, xncs) =>
adamc@255:                                   let
adamc@255:                                       val k = (L'.KType, loc)
adamc@255:                                       val k' = foldl (fn (_, k') => (L'.KArrow (k, k'), loc)) k xs
adamc@255:                                       val t = (L'.CModProj (n, ms, s), loc)
adamc@255:                                       val (env, n') = E.pushCNamed env x k' (SOME t)
adamc@255:                                       val env = E.pushDatatype env n' xs xncs
adamc@255: 
adamc@255:                                       val t = (L'.CNamed n', loc)
adamc@255:                                       val env = foldl (fn ((x, n, to), env) =>
adamc@255:                                                           let
adamc@255:                                                               val t = case to of
adamc@255:                                                                           NONE => t
adamc@255:                                                                         | SOME t' => (L'.TFun (t', t), loc)
adamc@255: 
adamc@255:                                                               val t = foldr (fn (x, t) =>
adamc@255:                                                                                 (L'.TCFun (L'.Implicit, x, k, t), loc))
adamc@255:                                                                             t xs
adamc@255:                                                           in
adamc@255:                                                               E.pushENamedAs env x n t
adamc@255:                                                           end) env xncs
adamc@255:                                   in
adamc@255:                                       ([(L'.DDatatypeImp (x, n', n, ms, s, xs, xncs), loc)], (env, denv, enD gs' @ gs))
adamc@255:                                   end)
adamc@255:                            | _ => (strError env (NotDatatype loc);
adamc@255:                                    ([], (env, denv, [])))
adamc@255:                      end)
adamc@255: 
adamc@255:               | L.DVal (x, co, e) =>
adamc@255:                 let
adamc@255:                     val (c', _, gs1) = case co of
adamc@255:                                            NONE => (cunif (loc, ktype), ktype, [])
adamc@255:                                          | SOME c => elabCon (env, denv) c
adamc@255: 
adamc@255:                     val (e', et, gs2) = elabExp (env, denv) e
adamc@255:                     val gs3 = checkCon (env, denv) e' et c'
adamc@467:                     val c = normClassConstraint env c'
adamc@255:                     val (env', n) = E.pushENamed env x c'
adamc@334:                     val c' = makeInstantiable c'
adamc@255:                 in
adamc@255:                     (*prefaces "DVal" [("x", Print.PD.string x),
adamc@362:                                      ("c'", p_con env c')];*)
adamc@467:                     ([(L'.DVal (x, n, c', e'), loc)], (env', denv, enD gs1 @ gs2 @ enD gs3 @ gs))
adamc@255:                 end
adamc@255:               | L.DValRec vis =>
adamc@255:                 let
adamc@255:                     fun allowable (e, _) =
adamc@255:                         case e of
adamc@255:                             L.EAbs _ => true
adamc@255:                           | L.ECAbs (_, _, _, e) => allowable e
adamc@255:                           | L.EDisjoint (_, _, e) => allowable e
adamc@255:                           | _ => false
adamc@255: 
adamc@255:                     val (vis, gs) = ListUtil.foldlMap
adamc@255:                                         (fn ((x, co, e), gs) =>
adamc@255:                                             let
adamc@255:                                                 val (c', _, gs1) = case co of
adamc@255:                                                                        NONE => (cunif (loc, ktype), ktype, [])
adamc@255:                                                                      | SOME c => elabCon (env, denv) c
adamc@255:                                             in
adamc@255:                                                 ((x, c', e), enD gs1 @ gs)
adamc@280:                                             end) gs vis
adamc@255: 
adamc@255:                     val (vis, env) = ListUtil.foldlMap (fn ((x, c', e), env) =>
adamc@255:                                                            let
adamc@255:                                                                val (env, n) = E.pushENamed env x c'
adamc@255:                                                            in
adamc@255:                                                                ((x, n, c', e), env)
adamc@255:                                                            end) env vis
adamc@255: 
adamc@255:                     val (vis, gs) = ListUtil.foldlMap (fn ((x, n, c', e), gs) =>
adamc@255:                                                           let
adamc@255:                                                               val (e', et, gs1) = elabExp (env, denv) e
adamc@255:                                                                                   
adamc@255:                                                               val gs2 = checkCon (env, denv) e' et c'
adamc@334: 
adamc@334:                                                               val c' = makeInstantiable c'
adamc@255:                                                           in
adamc@255:                                                               if allowable e then
adamc@255:                                                                   ()
adamc@255:                                                               else
adamc@255:                                                                   expError env (IllegalRec (x, e'));
adamc@255:                                                               ((x, n, c', e'), gs1 @ enD gs2 @ gs)
adamc@255:                                                           end) gs vis
adamc@255:                 in
adamc@255:                     ([(L'.DValRec vis, loc)], (env, denv, gs))
adamc@255:                 end
adamc@255: 
adamc@255:               | L.DSgn (x, sgn) =>
adamc@255:                 let
adamc@255:                     val (sgn', gs') = elabSgn (env, denv) sgn
adamc@255:                     val (env', n) = E.pushSgnNamed env x sgn'
adamc@255:                 in
adamc@255:                     ([(L'.DSgn (x, n, sgn'), loc)], (env', denv, enD gs' @ gs))
adamc@255:                 end
adamc@255: 
adamc@255:               | L.DStr (x, sgno, str) =>
adamc@255:                 let
adamc@255:                     val () = if x = "Basis" then
adamc@255:                                  raise Fail "Not allowed to redefine structure 'Basis'"
adamc@255:                              else
adamc@255:                                  ()
adamc@255: 
adamc@255:                     val formal = Option.map (elabSgn (env, denv)) sgno
adamc@255: 
adamc@255:                     val (str', sgn', gs') =
adamc@255:                         case formal of
adamc@255:                             NONE =>
adamc@255:                             let
adamc@255:                                 val (str', actual, gs') = elabStr (env, denv) str
adamc@255:                             in
adamc@255:                                 (str', selfifyAt env {str = str', sgn = actual}, gs')
adamc@255:                             end
adamc@255:                           | SOME (formal, gs1) =>
adamc@255:                             let
adamc@325:                                 val str = wildifyStr env (str, formal)
adamc@255:                                 val (str', actual, gs2) = elabStr (env, denv) str
adamc@255:                             in
adamc@255:                                 subSgn (env, denv) (selfifyAt env {str = str', sgn = actual}) formal;
adamc@255:                                 (str', formal, enD gs1 @ gs2)
adamc@255:                             end
adamc@255: 
adamc@255:                     val (env', n) = E.pushStrNamed env x sgn'
adamc@255:                 in
adamc@255:                     case #1 (hnormSgn env sgn') of
adamc@255:                         L'.SgnFun _ =>
adamc@255:                         (case #1 str' of
adamc@255:                              L'.StrFun _ => ()
adamc@255:                            | _ => strError env (FunctorRebind loc))
adamc@255:                       | _ => ();
adamc@255: 
adamc@255:                     ([(L'.DStr (x, n, sgn', str'), loc)], (env', denv, gs' @ gs))
adamc@255:                 end
adamc@255: 
adamc@255:               | L.DFfiStr (x, sgn) =>
adamc@255:                 let
adamc@255:                     val (sgn', gs') = elabSgn (env, denv) sgn
adamc@255: 
adamc@255:                     val (env', n) = E.pushStrNamed env x sgn'
adamc@255:                 in
adamc@255:                     ([(L'.DFfiStr (x, n, sgn'), loc)], (env', denv, enD gs' @ gs))
adamc@255:                 end
adamc@255: 
adamc@255:               | L.DOpen (m, ms) =>
adamc@255:                 (case E.lookupStr env m of
adamc@255:                      NONE => (strError env (UnboundStr (loc, m));
adamc@255:                               ([], (env, denv, gs)))
adamc@255:                    | SOME (n, sgn) =>
adamc@255:                      let
adamc@255:                          val (_, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@255:                                                   case E.projectStr env {str = str, sgn = sgn, field = m} of
adamc@255:                                                       NONE => (strError env (UnboundStr (loc, m));
adamc@255:                                                                (strerror, sgnerror))
adamc@255:                                                     | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@255:                                               ((L'.StrVar n, loc), sgn) ms
adamc@255: 
adamc@255:                          val (ds, (env', denv')) = dopen (env, denv) {str = n, strs = ms, sgn = sgn}
adamc@255:                          val denv' = dopenConstraints (loc, env', denv') {str = m, strs = ms}
adamc@255:                      in
adamc@255:                          (ds, (env', denv', gs))
adamc@255:                      end)
adamc@255: 
adamc@255:               | L.DConstraint (c1, c2) =>
adamc@255:                 let
adamc@255:                     val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@255:                     val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@255:                     val gs3 = D.prove env denv (c1', c2', loc)
adamc@255: 
adamc@255:                     val (denv', gs4) = D.assert env denv (c1', c2')
adamc@255:                 in
adamc@255:                     checkKind env c1' k1 (L'.KRecord (kunif loc), loc);
adamc@255:                     checkKind env c2' k2 (L'.KRecord (kunif loc), loc);
adamc@255: 
adamc@255:                     ([(L'.DConstraint (c1', c2'), loc)], (env, denv', enD gs1 @ enD gs2 @ enD gs3 @ enD gs4 @ gs))
adamc@255:                 end
adamc@255: 
adamc@255:               | L.DOpenConstraints (m, ms) =>
adamc@255:                 let
adamc@255:                     val denv = dopenConstraints (loc, env, denv) {str = m, strs = ms}
adamc@255:                 in
adamc@255:                     ([], (env, denv, gs))
adamc@255:                 end
adamc@255: 
adamc@255:               | L.DExport str =>
adamc@255:                 let
adamc@255:                     val (str', sgn, gs') = elabStr (env, denv) str
adamc@255: 
adamc@255:                     val sgn =
adamc@255:                         case #1 (hnormSgn env sgn) of
adamc@255:                             L'.SgnConst sgis =>
adamc@255:                             let
adamc@255:                                 fun doOne (all as (sgi, _), env) =
adamc@255:                                     (case sgi of
adamc@255:                                          L'.SgiVal (x, n, t) =>
adamc@325:                                          let
adamc@325:                                              fun doPage (makeRes, ran) =
adamc@325:                                                  case hnormCon (env, denv) ran of
adamc@325:                                                      ((L'.CApp (tf, arg), _), []) =>
adamc@325:                                                      (case (hnormCon (env, denv) tf, hnormCon (env, denv) arg) of
adamc@325:                                                           (((L'.CModProj (basis, [], "transaction"), _), []),
adamc@325:                                                            ((L'.CApp (tf, arg3), _), [])) =>
adamc@325:                                                           (case (basis = !basis_r,
adamc@325:                                                                  hnormCon (env, denv) tf, hnormCon (env, denv) arg3) of
adamc@325:                                                                (true,
adamc@325:                                                                 ((L'.CApp (tf, arg2), _), []),
adamc@325:                                                                 (((L'.CRecord (_, []), _), []))) =>
adamc@325:                                                                (case (hnormCon (env, denv) tf) of
adamc@325:                                                                     ((L'.CApp (tf, arg1), _), []) =>
adamc@325:                                                                     (case (hnormCon (env, denv) tf,
adamc@325:                                                                            hnormCon (env, denv) arg1,
adamc@325:                                                                            hnormCon (env, denv) arg2) of
adamc@325:                                                                          ((tf, []), (arg1, []),
adamc@325:                                                                           ((L'.CRecord (_, []), _), [])) =>
adamc@325:                                                                          let
adamc@325:                                                                              val t = (L'.CApp (tf, arg1), loc)
adamc@325:                                                                              val t = (L'.CApp (t, arg2), loc)
adamc@325:                                                                              val t = (L'.CApp (t, arg3), loc)
adamc@325:                                                                              val t = (L'.CApp (
adamc@325:                                                                                       (L'.CModProj
adamc@325:                                                                                            (basis, [], "transaction"), loc),
adamc@325:                                                                                       t), loc)
adamc@325:                                                                          in
adamc@325:                                                                              (L'.SgiVal (x, n, makeRes t), loc)
adamc@325:                                                                          end
adamc@325:                                                                        | _ => all)
adamc@325:                                                                   | _ => all)
adamc@325:                                                              | _ => all)
adamc@325:                                                         | _ => all)
adamc@325:                                                    | _ => all
adamc@325:                                          in
adamc@325:                                              case hnormCon (env, denv) t of
adamc@325:                                                  ((L'.TFun (dom, ran), _), []) =>
adamc@325:                                                  (case hnormCon (env, denv) dom of
adamc@325:                                                       ((L'.TRecord domR, _), []) =>
adamc@325:                                                       doPage (fn t => (L'.TFun ((L'.TRecord domR,
adamc@325:                                                                                  loc),
adamc@325:                                                                                 t), loc), ran)
adamc@325:                                                     | _ => all)
adamc@325:                                                | _ => doPage (fn t => t, t)
adamc@325:                                          end
adamc@255:                                        | _ => all,
adamc@255:                                      E.sgiBinds env all)
adamc@255:                             in
adamc@255:                                 (L'.SgnConst (#1 (ListUtil.foldlMap doOne env sgis)), loc)
adamc@255:                             end
adamc@255:                           | _ => sgn
adamc@255:                 in
adamc@255:                     ([(L'.DExport (E.newNamed (), sgn, str'), loc)], (env, denv, gs' @ gs))
adamc@255:                 end
adamc@255: 
adamc@255:               | L.DTable (x, c) =>
adamc@255:                 let
adamc@255:                     val (c', k, gs') = elabCon (env, denv) c
adamc@255:                     val (env, n) = E.pushENamed env x (L'.CApp (tableOf (), c'), loc)
adamc@255:                 in
adamc@255:                     checkKind env c' k (L'.KRecord (L'.KType, loc), loc);
adamc@255:                     ([(L'.DTable (!basis_r, x, n, c'), loc)], (env, denv, enD gs' @ gs))
adamc@255:                 end
adamc@338:               | L.DSequence x =>
adamc@338:                 let
adamc@338:                     val (env, n) = E.pushENamed env x (sequenceOf ())
adamc@338:                 in
adamc@338:                     ([(L'.DSequence (!basis_r, x, n), loc)], (env, denv, gs))
adamc@338:                 end
adamc@255: 
adamc@255:               | L.DClass (x, c) =>
adamc@255:                 let
adamc@255:                     val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@280:                     val (c', ck, gs') = elabCon (env, denv) c
adamc@255:                     val (env, n) = E.pushCNamed env x k (SOME c')
adamc@255:                     val env = E.pushClass env n
adamc@255:                 in
adamc@255:                     checkKind env c' ck k;
adamc@280:                     ([(L'.DClass (x, n, c'), loc)], (env, denv, enD gs' @ gs))
adamc@255:                 end
adamc@271: 
adamc@280:               | L.DDatabase s => ([(L'.DDatabase s, loc)], (env, denv, gs))
adamc@280: 
adamc@459:               | L.DCookie (x, c) =>
adamc@459:                 let
adamc@459:                     val (c', k, gs') = elabCon (env, denv) c
adamc@459:                     val (env, n) = E.pushENamed env x (L'.CApp (cookieOf (), c'), loc)
adamc@459:                 in
adamc@459:                     checkKind env c' k (L'.KType, loc);
adamc@459:                     ([(L'.DCookie (!basis_r, x, n, c'), loc)], (env, denv, enD gs' @ gs))
adamc@459:                 end
adamc@459: 
adamc@280:         (*val tcs = List.filter (fn TypeClass _ => true | _ => false) (#3 (#2 r))*)
adamc@255:     in
adamc@280:         (*prefaces "elabDecl" [("e", SourcePrint.p_decl dAll),
adamc@280:                             ("|tcs|", PD.string (Int.toString (length tcs)))];*)
adamc@280: 
adamc@255:         r
adamc@255:     end
adamc@211: 
adamc@83: and elabStr (env, denv) (str, loc) =
adamc@31:     case str of
adamc@31:         L.StrConst ds =>
adamc@31:         let
adamc@88:             val (ds', (_, _, gs)) = ListUtil.foldlMapConcat elabDecl (env, denv, []) ds
adamc@123:             val sgis = ListUtil.mapConcat sgiOfDecl ds'
adamc@63: 
adamc@63:             val (sgis, _, _, _, _) =
adamc@64:                 foldr (fn ((sgi, loc), (sgis, cons, vals, sgns, strs)) =>
adamc@63:                           case sgi of
adamc@64:                               L'.SgiConAbs (x, n, k) =>
adamc@64:                               let
adamc@64:                                   val (cons, x) =
adamc@64:                                       if SS.member (cons, x) then
adamc@64:                                           (cons, "?" ^ x)
adamc@64:                                       else
adamc@64:                                           (SS.add (cons, x), x)
adamc@64:                               in
adamc@64:                                   ((L'.SgiConAbs (x, n, k), loc) :: sgis, cons, vals, sgns, strs)
adamc@64:                               end
adamc@64:                             | L'.SgiCon (x, n, k, c) =>
adamc@64:                               let
adamc@64:                                   val (cons, x) =
adamc@64:                                       if SS.member (cons, x) then
adamc@64:                                           (cons, "?" ^ x)
adamc@64:                                       else
adamc@64:                                           (SS.add (cons, x), x)
adamc@64:                               in
adamc@64:                                   ((L'.SgiCon (x, n, k, c), loc) :: sgis, cons, vals, sgns, strs)
adamc@64:                               end
adamc@191:                             | L'.SgiDatatype (x, n, xs, xncs) =>
adamc@156:                               let
adamc@156:                                   val (cons, x) =
adamc@156:                                       if SS.member (cons, x) then
adamc@156:                                           (cons, "?" ^ x)
adamc@156:                                       else
adamc@156:                                           (SS.add (cons, x), x)
adamc@156: 
adamc@156:                                   val (xncs, vals) =
adamc@156:                                       ListUtil.foldlMap
adamc@156:                                           (fn ((x, n, t), vals) =>
adamc@156:                                               if SS.member (vals, x) then
adamc@156:                                                   (("?" ^ x, n, t), vals)
adamc@156:                                               else
adamc@156:                                                   ((x, n, t), SS.add (vals, x)))
adamc@156:                                       vals xncs
adamc@156:                               in
adamc@191:                                   ((L'.SgiDatatype (x, n, xs, xncs), loc) :: sgis, cons, vals, sgns, strs)
adamc@156:                               end
adamc@191:                             | L'.SgiDatatypeImp (x, n, m1, ms, x', xs, xncs) =>
adamc@156:                               let
adamc@156:                                   val (cons, x) =
adamc@156:                                       if SS.member (cons, x) then
adamc@156:                                           (cons, "?" ^ x)
adamc@156:                                       else
adamc@156:                                           (SS.add (cons, x), x)
adamc@156:                               in
adamc@191:                                   ((L'.SgiDatatypeImp (x, n, m1, ms, x', xs, xncs), loc) :: sgis, cons, vals, sgns, strs)
adamc@156:                               end
adamc@64:                             | L'.SgiVal (x, n, c) =>
adamc@64:                               let
adamc@64:                                   val (vals, x) =
adamc@64:                                       if SS.member (vals, x) then
adamc@64:                                           (vals, "?" ^ x)
adamc@64:                                       else
adamc@64:                                           (SS.add (vals, x), x)
adamc@64:                               in
adamc@64:                                   ((L'.SgiVal (x, n, c), loc) :: sgis, cons, vals, sgns, strs)
adamc@64:                               end
adamc@64:                             | L'.SgiSgn (x, n, sgn) =>
adamc@64:                               let
adamc@64:                                   val (sgns, x) =
adamc@64:                                       if SS.member (sgns, x) then
adamc@64:                                           (sgns, "?" ^ x)
adamc@64:                                       else
adamc@64:                                           (SS.add (sgns, x), x)
adamc@64:                               in
adamc@64:                                   ((L'.SgiSgn (x, n, sgn), loc) :: sgis, cons, vals, sgns, strs)
adamc@64:                               end
adamc@64:  
adamc@64:                             | L'.SgiStr (x, n, sgn) =>
adamc@64:                               let
adamc@64:                                   val (strs, x) =
adamc@64:                                       if SS.member (strs, x) then
adamc@64:                                           (strs, "?" ^ x)
adamc@64:                                       else
adamc@64:                                           (SS.add (strs, x), x)
adamc@64:                               in
adamc@64:                                   ((L'.SgiStr (x, n, sgn), loc) :: sgis, cons, vals, sgns, strs)
adamc@88:                               end
adamc@203:                             | L'.SgiConstraint _ => ((sgi, loc) :: sgis, cons, vals, sgns, strs)
adamc@211:                             | L'.SgiClassAbs (x, n) =>
adamc@211:                               let
adamc@211:                                   val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211: 
adamc@211:                                   val (cons, x) =
adamc@211:                                       if SS.member (cons, x) then
adamc@211:                                           (cons, "?" ^ x)
adamc@211:                                       else
adamc@211:                                           (SS.add (cons, x), x)
adamc@211:                               in
adamc@211:                                   ((L'.SgiClassAbs (x, n), loc) :: sgis, cons, vals, sgns, strs)
adamc@211:                               end
adamc@211:                             | L'.SgiClass (x, n, c) =>
adamc@211:                               let
adamc@211:                                   val k = (L'.KArrow ((L'.KType, loc), (L'.KType, loc)), loc)
adamc@211: 
adamc@211:                                   val (cons, x) =
adamc@211:                                       if SS.member (cons, x) then
adamc@211:                                           (cons, "?" ^ x)
adamc@211:                                       else
adamc@211:                                           (SS.add (cons, x), x)
adamc@211:                               in
adamc@211:                                   ((L'.SgiClass (x, n, c), loc) :: sgis, cons, vals, sgns, strs)
adamc@203:                               end)
adamc@64: 
adamc@63:                 ([], SS.empty, SS.empty, SS.empty, SS.empty) sgis
adamc@31:         in
adamc@83:             ((L'.StrConst ds', loc), (L'.SgnConst sgis, loc), gs)
adamc@31:         end
adamc@31:       | L.StrVar x =>
adamc@31:         (case E.lookupStr env x of
adamc@31:              NONE =>
adamc@31:              (strError env (UnboundStr (loc, x));
adamc@83:               (strerror, sgnerror, []))
adamc@83:            | SOME (n, sgn) => ((L'.StrVar n, loc), sgn, []))
adamc@34:       | L.StrProj (str, x) =>
adamc@34:         let
adamc@83:             val (str', sgn, gs) = elabStr (env, denv) str
adamc@34:         in
adamc@34:             case E.projectStr env {str = str', sgn = sgn, field = x} of
adamc@34:                 NONE => (strError env (UnboundStr (loc, x));
adamc@83:                          (strerror, sgnerror, []))
adamc@83:               | SOME sgn => ((L'.StrProj (str', x), loc), sgn, gs)
adamc@34:         end
adamc@41:       | L.StrFun (m, dom, ranO, str) =>
adamc@41:         let
adamc@83:             val (dom', gs1) = elabSgn (env, denv) dom
adamc@41:             val (env', n) = E.pushStrNamed env m dom'
adamc@83:             val (str', actual, gs2) = elabStr (env', denv) str
adamc@41: 
adamc@83:             val (formal, gs3) =
adamc@41:                 case ranO of
adamc@83:                     NONE => (actual, [])
adamc@41:                   | SOME ran =>
adamc@41:                     let
adamc@83:                         val (ran', gs) = elabSgn (env', denv) ran
adamc@41:                     in
adamc@86:                         subSgn (env', denv) actual ran';
adamc@83:                         (ran', gs)
adamc@41:                     end
adamc@41:         in
adamc@41:             ((L'.StrFun (m, n, dom', formal, str'), loc),
adamc@83:              (L'.SgnFun (m, n, dom', formal), loc),
adamc@228:              enD gs1 @ gs2 @ enD gs3)
adamc@41:         end
adamc@44:       | L.StrApp (str1, str2) =>
adamc@44:         let
adamc@83:             val (str1', sgn1, gs1) = elabStr (env, denv) str1
adamc@325:             val str2 =
adamc@325:                 case sgn1 of
adamc@325:                     (L'.SgnFun (_, _, dom, _), _) =>
adamc@325:                     wildifyStr env (str2, dom)
adamc@325:                   | _ => str2
adamc@83:             val (str2', sgn2, gs2) = elabStr (env, denv) str2
adamc@44:         in
adamc@44:             case #1 (hnormSgn env sgn1) of
adamc@83:                 L'.SgnError => (strerror, sgnerror, [])
adamc@44:               | L'.SgnFun (m, n, dom, ran) =>
adamc@86:                 (subSgn (env, denv) sgn2 dom;
adamc@44:                  case #1 (hnormSgn env ran) of
adamc@83:                      L'.SgnError => (strerror, sgnerror, [])
adamc@44:                    | L'.SgnConst sgis =>
adamc@44:                      ((L'.StrApp (str1', str2'), loc),
adamc@83:                       (L'.SgnConst ((L'.SgiStr (m, n, selfifyAt env {str = str2', sgn = sgn2}), loc) :: sgis), loc),
adamc@83:                       gs1 @ gs2)
adamc@44:                    | _ => raise Fail "Unable to hnormSgn in functor application")
adamc@44:               | _ => (strError env (NotFunctor sgn1);
adamc@83:                       (strerror, sgnerror, []))
adamc@44:         end
adamc@31: 
adamc@325: fun elabFile basis topStr topSgn env file =
adamc@56:     let
adamc@83:         val (sgn, gs) = elabSgn (env, D.empty) (L.SgnConst basis, ErrorMsg.dummySpan)
adamc@83:         val () = case gs of
adamc@83:                      [] => ()
adamc@207:                    | _ => (app (fn (_, env, _, c1, c2) =>
adamc@207:                                    prefaces "Unresolved"
adamc@207:                                    [("c1", p_con env c1),
adamc@207:                                     ("c2", p_con env c2)]) gs;
adamc@207:                            raise Fail "Unresolved disjointness constraints in Basis")
adamc@83: 
adamc@56:         val (env', basis_n) = E.pushStrNamed env "Basis" sgn
adamc@210:         val () = basis_r := basis_n
adamc@56: 
adamc@88:         val (ds, (env', _)) = dopen (env', D.empty) {str = basis_n, strs = [], sgn = sgn}
adamc@56: 
adamc@56:         fun discoverC r x =
adamc@56:             case E.lookupC env' x of
adamc@56:                 E.NotBound => raise Fail ("Constructor " ^ x ^ " unbound in Basis")
adamc@56:               | E.Rel _ => raise Fail ("Constructor " ^ x ^ " bound relatively in Basis")
adamc@56:               | E.Named (n, (_, loc)) => r := (L'.CNamed n, loc)
adamc@56: 
adamc@56:         val () = discoverC int "int"
adamc@56:         val () = discoverC float "float"
adamc@56:         val () = discoverC string "string"
adamc@203:         val () = discoverC table "sql_table"
adamc@56: 
adamc@325:         val (topSgn, gs) = elabSgn (env', D.empty) (L.SgnConst topSgn, ErrorMsg.dummySpan)
adamc@325:         val () = case gs of
adamc@325:                      [] => ()
adamc@325:                    | _ => raise Fail "Unresolved disjointness constraints in top.urs"
adamc@325:         val (topStr, topSgn', gs) = elabStr (env', D.empty) (L.StrConst topStr, ErrorMsg.dummySpan)
adamc@325:         val () = case gs of
adamc@325:                      [] => ()
adamc@329:                    | _ => app (fn Disjoint (loc, env, denv, c1, c2) =>
adamc@329:                                   (case D.prove env denv (c1, c2, loc) of
adamc@329:                                        [] => ()
adamc@329:                                      | _ =>
adamc@329:                                        (prefaces "Unresolved constraint in top.ur"
adamc@329:                                                  [("loc", PD.string (ErrorMsg.spanToString loc)),
adamc@329:                                                   ("c1", p_con env c1),
adamc@329:                                                   ("c2", p_con env c2)];
adamc@329:                                         raise Fail "Unresolve constraint in top.ur"))
adamc@329:                                 | TypeClass _ => raise Fail "Unresolved type class constraint in top.ur") gs
adamc@325:         val () = subSgn (env', D.empty) topSgn' topSgn
adamc@325: 
adamc@325:         val (env', top_n) = E.pushStrNamed env' "Top" topSgn
adamc@325: 
adamc@325:         val (ds', (env', _)) = dopen (env', D.empty) {str = top_n, strs = [], sgn = topSgn}
adamc@325: 
adamc@83:         fun elabDecl' (d, (env, gs)) =
adamc@76:             let
adamc@76:                 val () = resetKunif ()
adamc@76:                 val () = resetCunif ()
adamc@88:                 val (ds, (env, _, gs)) = elabDecl (d, (env, D.empty, gs))
adamc@76:             in
adamc@76:                 if ErrorMsg.anyErrors () then
adamc@76:                     ()
adamc@76:                 else (
adamc@76:                     if List.exists kunifsInDecl ds then
adamc@91:                         declError env (KunifsRemain ds)
adamc@76:                     else
adamc@76:                         ();
adamc@76:                     
adamc@76:                     case ListUtil.search cunifsInDecl ds of
adamc@76:                         NONE => ()
adamc@76:                       | SOME loc =>
adamc@91:                         declError env (CunifsRemain ds)
adamc@76:                     );
adamc@76: 
adamc@83:                 (ds, (env, gs))
adamc@76:             end
adamc@76: 
adamc@83:         val (file, (_, gs)) = ListUtil.foldlMapConcat elabDecl' (env', []) file
adamc@56:     in
adamc@84:         if ErrorMsg.anyErrors () then
adamc@84:             ()
adamc@84:         else
adamc@228:             app (fn Disjoint (loc, env, denv, c1, c2) =>
adamc@228:                     (case D.prove env denv (c1, c2, loc) of
adamc@228:                          [] => ()
adamc@228:                        | _ =>
adamc@228:                          (ErrorMsg.errorAt loc "Couldn't prove field name disjointness";
adamc@228:                           eprefaces' [("Con 1", p_con env c1),
adamc@228:                                       ("Con 2", p_con env c2),
adamc@228:                                       ("Hnormed 1", p_con env (ElabOps.hnormCon env c1)),
adamc@228:                                       ("Hnormed 2", p_con env (ElabOps.hnormCon env c2))]))
adamc@228:                   | TypeClass (env, c, r, loc) =>
adamc@349:                     let
adamc@467:                         val c = normClassKey env c
adamc@349:                     in
adamc@349:                         case E.resolveClass env c of
adamc@349:                             SOME e => r := SOME e
adamc@349:                           | NONE => expError env (Unresolvable (loc, c))
adamc@349:                     end) gs;
adamc@83: 
adamc@325:         (L'.DFfiStr ("Basis", basis_n, sgn), ErrorMsg.dummySpan)
adamc@325:         :: ds
adamc@325:         @ (L'.DStr ("Top", top_n, topSgn, topStr), ErrorMsg.dummySpan)
adamc@325:         :: ds' @ file
adamc@56:     end
adamc@2: 
adamc@2: end