adamc@2: (* Copyright (c) 2008, Adam Chlipala
adamc@2:  * All rights reserved.
adamc@2:  *
adamc@2:  * Redistribution and use in source and binary forms, with or without
adamc@2:  * modification, are permitted provided that the following conditions are met:
adamc@2:  *
adamc@2:  * - Redistributions of source code must retain the above copyright notice,
adamc@2:  *   this list of conditions and the following disclaimer.
adamc@2:  * - Redistributions in binary form must reproduce the above copyright notice,
adamc@2:  *   this list of conditions and the following disclaimer in the documentation
adamc@2:  *   and/or other materials provided with the distribution.
adamc@2:  * - The names of contributors may not be used to endorse or promote products
adamc@2:  *   derived from this software without specific prior written permission.
adamc@2:  *
adamc@2:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@2:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@2:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@2:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@2:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
adamc@2:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@2:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@2:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@2:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@2:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@2:  * POSSIBILITY OF SUCH DAMAGE.
adamc@2:  *)
adamc@2: 
adamc@2: structure Elaborate :> ELABORATE = struct
adamc@2: 
adamc@14: structure P = Prim
adamc@4: structure L = Source
adamc@2: structure L' = Elab
adamc@2: structure E = ElabEnv
adamc@2: structure U = ElabUtil
adamc@82: structure D = Disjoint
adamc@2: 
adamc@3: open Print
adamc@3: open ElabPrint
adamc@3: 
adamc@62: structure SS = BinarySetFn(struct
adamc@62:                            type ord_key = string
adamc@62:                            val compare = String.compare
adamc@62:                            end)
adamc@62: 
adamc@2: fun elabExplicitness e =
adamc@2:     case e of
adamc@2:         L.Explicit => L'.Explicit
adamc@2:       | L.Implicit => L'.Implicit
adamc@2: 
adamc@2: fun occursKind r =
adamc@76:     U.Kind.exists (fn L'.KUnif (_, _, r') => r = r'
adamc@2:                     | _ => false)
adamc@2: 
adamc@3: datatype kunify_error =
adamc@2:          KOccursCheckFailed of L'.kind * L'.kind
adamc@2:        | KIncompatible of L'.kind * L'.kind
adamc@2: 
adamc@3: exception KUnify' of kunify_error
adamc@3: 
adamc@3: fun kunifyError err =
adamc@2:     case err of
adamc@2:         KOccursCheckFailed (k1, k2) =>
adamc@3:         eprefaces "Kind occurs check failed"
adamc@3:         [("Kind 1", p_kind k1),
adamc@3:          ("Kind 2", p_kind k2)]
adamc@2:       | KIncompatible (k1, k2) =>
adamc@3:         eprefaces "Incompatible kinds"
adamc@3:         [("Kind 1", p_kind k1),
adamc@3:          ("Kind 2", p_kind k2)]
adamc@2: 
adamc@3: fun unifyKinds' (k1All as (k1, _)) (k2All as (k2, _)) =
adamc@2:     let
adamc@3:         fun err f = raise KUnify' (f (k1All, k2All))
adamc@2:     in
adamc@2:         case (k1, k2) of
adamc@2:             (L'.KType, L'.KType) => ()
adamc@82:           | (L'.KUnit, L'.KUnit) => ()
adamc@82: 
adamc@2:           | (L'.KArrow (d1, r1), L'.KArrow (d2, r2)) =>
adamc@3:             (unifyKinds' d1 d2;
adamc@3:              unifyKinds' r1 r2)
adamc@2:           | (L'.KName, L'.KName) => ()
adamc@3:           | (L'.KRecord k1, L'.KRecord k2) => unifyKinds' k1 k2
adamc@2: 
adamc@2:           | (L'.KError, _) => ()
adamc@2:           | (_, L'.KError) => ()
adamc@2: 
adamc@76:           | (L'.KUnif (_, _, ref (SOME k1All)), _) => unifyKinds' k1All k2All
adamc@76:           | (_, L'.KUnif (_, _, ref (SOME k2All))) => unifyKinds' k1All k2All
adamc@2: 
adamc@76:           | (L'.KUnif (_, _, r1), L'.KUnif (_, _, r2)) =>
adamc@2:             if r1 = r2 then
adamc@2:                 ()
adamc@2:             else
adamc@2:                 r1 := SOME k2All
adamc@2: 
adamc@76:           | (L'.KUnif (_, _, r), _) =>
adamc@2:             if occursKind r k2All then
adamc@2:                 err KOccursCheckFailed
adamc@2:             else
adamc@2:                 r := SOME k2All
adamc@76:           | (_, L'.KUnif (_, _, r)) =>
adamc@2:             if occursKind r k1All then
adamc@2:                 err KOccursCheckFailed
adamc@2:             else
adamc@2:                 r := SOME k1All
adamc@2: 
adamc@2:           | _ => err KIncompatible
adamc@2:     end
adamc@2: 
adamc@3: exception KUnify of L'.kind * L'.kind * kunify_error
adamc@3: 
adamc@3: fun unifyKinds k1 k2 =
adamc@3:     unifyKinds' k1 k2
adamc@3:     handle KUnify' err => raise KUnify (k1, k2, err)
adamc@3: 
adamc@3: datatype con_error =
adamc@3:          UnboundCon of ErrorMsg.span * string
adamc@34:        | UnboundStrInCon of ErrorMsg.span * string
adamc@3:        | WrongKind of L'.con * L'.kind * L'.kind * kunify_error
adamc@67:        | DuplicateField of ErrorMsg.span * string
adamc@3: 
adamc@5: fun conError env err =
adamc@3:     case err of
adamc@3:         UnboundCon (loc, s) =>
adamc@3:         ErrorMsg.errorAt loc ("Unbound constructor variable " ^ s)
adamc@34:       | UnboundStrInCon (loc, s) =>
adamc@34:         ErrorMsg.errorAt loc ("Unbound structure " ^ s)
adamc@3:       | WrongKind (c, k1, k2, kerr) =>
adamc@3:         (ErrorMsg.errorAt (#2 c) "Wrong kind";
adamc@5:          eprefaces' [("Constructor", p_con env c),
adamc@5:                      ("Have kind", p_kind k1),
adamc@5:                      ("Need kind", p_kind k2)];
adamc@3:          kunifyError kerr)
adamc@67:       | DuplicateField (loc, s) =>
adamc@67:         ErrorMsg.errorAt loc ("Duplicate record field " ^ s)
adamc@3: 
adamc@5: fun checkKind env c k1 k2 =
adamc@3:     unifyKinds k1 k2
adamc@3:     handle KUnify (k1, k2, err) =>
adamc@5:            conError env (WrongKind (c, k1, k2, err))
adamc@3: 
adamc@3: val dummy = ErrorMsg.dummySpan
adamc@3: 
adamc@3: val ktype = (L'.KType, dummy)
adamc@3: val kname = (L'.KName, dummy)
adamc@12: val ktype_record = (L'.KRecord ktype, dummy)
adamc@3: 
adamc@3: val cerror = (L'.CError, dummy)
adamc@3: val kerror = (L'.KError, dummy)
adamc@10: val eerror = (L'.EError, dummy)
adamc@31: val sgnerror = (L'.SgnError, dummy)
adamc@31: val strerror = (L'.StrError, dummy)
adamc@3: 
adamc@56: val int = ref cerror
adamc@56: val float = ref cerror
adamc@56: val string = ref cerror
adamc@56: 
adamc@3: local
adamc@3:     val count = ref 0
adamc@3: in
adamc@3: 
adamc@3: fun resetKunif () = count := 0
adamc@3: 
adamc@76: fun kunif loc =
adamc@3:     let
adamc@3:         val n = !count
adamc@3:         val s = if n <= 26 then
adamc@3:                     str (chr (ord #"A" + n))
adamc@3:                 else
adamc@3:                     "U" ^ Int.toString (n - 26)
adamc@3:     in
adamc@3:         count := n + 1;
adamc@76:         (L'.KUnif (loc, s, ref NONE), dummy)
adamc@3:     end
adamc@3: 
adamc@3: end
adamc@3: 
adamc@10: local
adamc@10:     val count = ref 0
adamc@10: in
adamc@10: 
adamc@10: fun resetCunif () = count := 0
adamc@10: 
adamc@76: fun cunif (loc, k) =
adamc@10:     let
adamc@10:         val n = !count
adamc@10:         val s = if n <= 26 then
adamc@10:                     str (chr (ord #"A" + n))
adamc@10:                 else
adamc@10:                     "U" ^ Int.toString (n - 26)
adamc@10:     in
adamc@10:         count := n + 1;
adamc@76:         (L'.CUnif (loc, k, s, ref NONE), dummy)
adamc@10:     end
adamc@10: 
adamc@10: end
adamc@10: 
adamc@18: fun elabKind (k, loc) =
adamc@18:     case k of
adamc@18:         L.KType => (L'.KType, loc)
adamc@18:       | L.KArrow (k1, k2) => (L'.KArrow (elabKind k1, elabKind k2), loc)
adamc@18:       | L.KName => (L'.KName, loc)
adamc@18:       | L.KRecord k => (L'.KRecord (elabKind k), loc)
adamc@82:       | L.KUnit => (L'.KUnit, loc)
adamc@76:       | L.KWild => kunif loc
adamc@18: 
adamc@67: fun foldKind (dom, ran, loc)=
adamc@67:     (L'.KArrow ((L'.KArrow ((L'.KName, loc),
adamc@67:                             (L'.KArrow (dom,
adamc@67:                                         (L'.KArrow (ran, ran), loc)), loc)), loc),
adamc@67:                 (L'.KArrow (ran,
adamc@67:                             (L'.KArrow ((L'.KRecord dom, loc),
adamc@67:                                         ran), loc)), loc)), loc)
adamc@67: 
adamc@83: fun elabCon (env, denv) (c, loc) =
adamc@3:     case c of
adamc@3:         L.CAnnot (c, k) =>
adamc@3:         let
adamc@3:             val k' = elabKind k
adamc@83:             val (c', ck, gs) = elabCon (env, denv) c
adamc@3:         in
adamc@5:             checkKind env c' ck k';
adamc@83:             (c', k', gs)
adamc@3:         end
adamc@3: 
adamc@3:       | L.TFun (t1, t2) =>
adamc@3:         let
adamc@83:             val (t1', k1, gs1) = elabCon (env, denv) t1
adamc@83:             val (t2', k2, gs2) = elabCon (env, denv) t2
adamc@3:         in
adamc@5:             checkKind env t1' k1 ktype;
adamc@5:             checkKind env t2' k2 ktype;
adamc@83:             ((L'.TFun (t1', t2'), loc), ktype, gs1 @ gs2)
adamc@3:         end
adamc@3:       | L.TCFun (e, x, k, t) =>
adamc@3:         let
adamc@3:             val e' = elabExplicitness e
adamc@3:             val k' = elabKind k
adamc@3:             val env' = E.pushCRel env x k'
adamc@83:             val (t', tk, gs) = elabCon (env', D.enter denv) t
adamc@3:         in
adamc@5:             checkKind env t' tk ktype;
adamc@83:             ((L'.TCFun (e', x, k', t'), loc), ktype, gs)
adamc@3:         end
adamc@85:       | L.TDisjoint (c1, c2, c) =>
adamc@85:         let
adamc@85:             val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@85:             val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@85: 
adamc@85:             val ku1 = kunif loc
adamc@85:             val ku2 = kunif loc
adamc@85: 
adamc@85:             val denv' = D.assert env denv (c1', c2')
adamc@85:             val (c', k, gs3) = elabCon (env, denv') c
adamc@85:         in
adamc@85:             checkKind env c1' k1 (L'.KRecord ku1, loc);
adamc@85:             checkKind env c2' k2 (L'.KRecord ku2, loc);
adamc@85: 
adamc@85:             ((L'.TDisjoint (c1', c2', c'), loc), k, gs1 @ gs2 @ gs3)
adamc@85:         end
adamc@3:       | L.TRecord c =>
adamc@3:         let
adamc@83:             val (c', ck, gs) = elabCon (env, denv) c
adamc@3:             val k = (L'.KRecord ktype, loc)
adamc@3:         in
adamc@5:             checkKind env c' ck k;
adamc@83:             ((L'.TRecord c', loc), ktype, gs)
adamc@3:         end
adamc@3: 
adamc@34:       | L.CVar ([], s) =>
adamc@3:         (case E.lookupC env s of
adamc@9:              E.NotBound =>
adamc@5:              (conError env (UnboundCon (loc, s));
adamc@83:               (cerror, kerror, []))
adamc@9:            | E.Rel (n, k) =>
adamc@83:              ((L'.CRel n, loc), k, [])
adamc@9:            | E.Named (n, k) =>
adamc@83:              ((L'.CNamed n, loc), k, []))
adamc@34:       | L.CVar (m1 :: ms, s) =>
adamc@34:         (case E.lookupStr env m1 of
adamc@42:              NONE => (conError env (UnboundStrInCon (loc, m1));
adamc@83:                       (cerror, kerror, []))
adamc@34:            | SOME (n, sgn) =>
adamc@34:              let
adamc@34:                  val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@34:                                      case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@34:                                          NONE => (conError env (UnboundStrInCon (loc, m));
adamc@34:                                                   (strerror, sgnerror))
adamc@34:                                        | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@34:                                   ((L'.StrVar n, loc), sgn) ms
adamc@34: 
adamc@34:                  val k = case E.projectCon env {sgn = sgn, str = str, field = s} of
adamc@34:                              NONE => (conError env (UnboundCon (loc, s));
adamc@34:                                       kerror)
adamc@34:                            | SOME (k, _) => k
adamc@34:              in
adamc@83:                  ((L'.CModProj (n, ms, s), loc), k, [])
adamc@34:              end)
adamc@34:                                                                        
adamc@3:       | L.CApp (c1, c2) =>
adamc@3:         let
adamc@83:             val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@83:             val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@76:             val dom = kunif loc
adamc@76:             val ran = kunif loc
adamc@3:         in
adamc@5:             checkKind env c1' k1 (L'.KArrow (dom, ran), loc);
adamc@5:             checkKind env c2' k2 dom;
adamc@83:             ((L'.CApp (c1', c2'), loc), ran, gs1 @ gs2)
adamc@3:         end
adamc@67:       | L.CAbs (x, ko, t) =>
adamc@3:         let
adamc@67:             val k' = case ko of
adamc@76:                          NONE => kunif loc
adamc@67:                        | SOME k => elabKind k
adamc@3:             val env' = E.pushCRel env x k'
adamc@83:             val (t', tk, gs) = elabCon (env', D.enter denv) t
adamc@3:         in
adamc@8:             ((L'.CAbs (x, k', t'), loc),
adamc@83:              (L'.KArrow (k', tk), loc),
adamc@83:              gs)
adamc@3:         end
adamc@3: 
adamc@84:       | L.CDisjoint (c1, c2, c) =>
adamc@84:         let
adamc@84:             val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@84:             val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@84: 
adamc@84:             val ku1 = kunif loc
adamc@84:             val ku2 = kunif loc
adamc@84: 
adamc@84:             val denv' = D.assert env denv (c1', c2')
adamc@84:             val (c', k, gs3) = elabCon (env, denv') c
adamc@84:         in
adamc@84:             checkKind env c1' k1 (L'.KRecord ku1, loc);
adamc@84:             checkKind env c2' k2 (L'.KRecord ku2, loc);
adamc@84: 
adamc@84:             ((L'.CDisjoint (c1', c2', c'), loc), k, gs1 @ gs2 @ gs3)
adamc@84:         end
adamc@84: 
adamc@3:       | L.CName s =>
adamc@83:         ((L'.CName s, loc), kname, [])
adamc@3: 
adamc@3:       | L.CRecord xcs =>
adamc@3:         let
adamc@76:             val k = kunif loc
adamc@3: 
adamc@83:             val (xcs', gs) = ListUtil.foldlMap (fn ((x, c), gs) =>
adamc@83:                                                    let
adamc@83:                                                        val (x', xk, gs1) = elabCon (env, denv) x
adamc@83:                                                        val (c', ck, gs2) = elabCon (env, denv) c
adamc@83:                                                    in
adamc@83:                                                        checkKind env x' xk kname;
adamc@83:                                                        checkKind env c' ck k;
adamc@83:                                                        ((x', c'), gs1 @ gs2 @ gs)
adamc@83:                                                    end) [] xcs
adamc@67: 
adamc@67:             val rc = (L'.CRecord (k, xcs'), loc)
adamc@67:             (* Add duplicate field checking later. *)
adamc@83: 
adamc@83:             fun prove (xcs, ds) =
adamc@83:                 case xcs of
adamc@83:                     [] => ds
adamc@83:                   | xc :: rest =>
adamc@83:                     let
adamc@83:                         val r1 = (L'.CRecord (k, [xc]), loc)
adamc@83:                         val ds = foldl (fn (xc', ds) =>
adamc@83:                                            let
adamc@83:                                                val r2 = (L'.CRecord (k, [xc']), loc)
adamc@83:                                            in
adamc@83:                                                map (fn cs => (loc, env, denv, cs)) (D.prove env denv (r1, r2, loc))
adamc@83:                                                @ ds
adamc@83:                                            end)
adamc@83:                                  ds rest
adamc@83:                     in
adamc@83:                         prove (rest, ds)
adamc@83:                     end
adamc@3:         in
adamc@83:             (rc, (L'.KRecord k, loc), prove (xcs', gs))
adamc@3:         end
adamc@3:       | L.CConcat (c1, c2) =>
adamc@3:         let
adamc@83:             val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@83:             val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@76:             val ku = kunif loc
adamc@3:             val k = (L'.KRecord ku, loc)
adamc@3:         in
adamc@5:             checkKind env c1' k1 k;
adamc@5:             checkKind env c2' k2 k;
adamc@83:             ((L'.CConcat (c1', c2'), loc), k,
adamc@83:              map (fn cs => (loc, env, denv, cs)) (D.prove env denv (c1', c2', loc)) @ gs1 @ gs2)
adamc@3:         end
adamc@67:       | L.CFold =>
adamc@67:         let
adamc@76:             val dom = kunif loc
adamc@76:             val ran = kunif loc
adamc@67:         in
adamc@67:             ((L'.CFold (dom, ran), loc),
adamc@83:              foldKind (dom, ran, loc),
adamc@83:              [])
adamc@67:         end
adamc@3: 
adamc@83:       | L.CUnit => ((L'.CUnit, loc), (L'.KUnit, loc), [])
adamc@82: 
adamc@18:       | L.CWild k =>
adamc@18:         let
adamc@18:             val k' = elabKind k
adamc@18:         in
adamc@83:             (cunif (loc, k'), k', [])
adamc@18:         end
adamc@18: 
adamc@6: fun kunifsRemain k =
adamc@6:     case k of
adamc@76:         L'.KUnif (_, _, ref NONE) => true
adamc@6:       | _ => false
adamc@10: fun cunifsRemain c =
adamc@10:     case c of
adamc@76:         L'.CUnif (loc, _, _, ref NONE) => SOME loc
adamc@76:       | _ => NONE
adamc@6: 
adamc@76: val kunifsInDecl = U.Decl.exists {kind = kunifsRemain,
adamc@76:                                   con = fn _ => false,
adamc@76:                                   exp = fn _ => false,
adamc@76:                                   sgn_item = fn _ => false,
adamc@76:                                   sgn = fn _ => false,
adamc@76:                                   str = fn _ => false,
adamc@76:                                   decl = fn _ => false}
adamc@10: 
adamc@76: val cunifsInDecl = U.Decl.search {kind = fn _ => NONE,
adamc@76:                                   con = cunifsRemain,
adamc@76:                                   exp = fn _ => NONE,
adamc@76:                                   sgn_item = fn _ => NONE,
adamc@76:                                   sgn = fn _ => NONE,
adamc@76:                                   str = fn _ => NONE,
adamc@76:                                   decl = fn _ => NONE}
adamc@10: 
adamc@10: fun occursCon r =
adamc@10:     U.Con.exists {kind = fn _ => false,
adamc@76:                   con = fn L'.CUnif (_, _, _, r') => r = r'
adamc@10:                          | _ => false}
adamc@10: 
adamc@10: datatype cunify_error =
adamc@10:          CKind of L'.kind * L'.kind * kunify_error
adamc@10:        | COccursCheckFailed of L'.con * L'.con
adamc@10:        | CIncompatible of L'.con * L'.con
adamc@10:        | CExplicitness of L'.con * L'.con
adamc@12:        | CKindof of L'.con
adamc@12:        | CRecordFailure
adamc@10: 
adamc@10: exception CUnify' of cunify_error
adamc@10: 
adamc@10: fun cunifyError env err =
adamc@10:     case err of
adamc@10:         CKind (k1, k2, kerr) =>
adamc@10:         (eprefaces "Kind unification failure"
adamc@10:                    [("Kind 1", p_kind k1),
adamc@10:                     ("Kind 2", p_kind k2)];
adamc@10:          kunifyError kerr)
adamc@10:       | COccursCheckFailed (c1, c2) =>
adamc@10:         eprefaces "Constructor occurs check failed"
adamc@10:                   [("Con 1", p_con env c1),
adamc@10:                    ("Con 2", p_con env c2)]
adamc@10:       | CIncompatible (c1, c2) =>
adamc@10:         eprefaces "Incompatible constructors"
adamc@10:                   [("Con 1", p_con env c1),
adamc@10:                    ("Con 2", p_con env c2)]
adamc@10:       | CExplicitness (c1, c2) =>
adamc@10:         eprefaces "Differing constructor function explicitness"
adamc@10:                   [("Con 1", p_con env c1),
adamc@10:                    ("Con 2", p_con env c2)]
adamc@12:       | CKindof c =>
adamc@12:         eprefaces "Kind unification variable blocks kindof calculation"
adamc@12:                   [("Con", p_con env c)]
adamc@12:       | CRecordFailure =>
adamc@12:         eprefaces "Can't unify record constructors" []
adamc@10: 
adamc@13: exception SynUnif = E.SynUnif
adamc@12: 
adamc@81: open ElabOps
adamc@43: 
adamc@12: type record_summary = {
adamc@12:      fields : (L'.con * L'.con) list,
adamc@12:      unifs : (L'.con * L'.con option ref) list,
adamc@12:      others : L'.con list
adamc@12: }
adamc@12: 
adamc@12: fun summaryToCon {fields, unifs, others} =
adamc@12:     let
adamc@12:         val c = (L'.CRecord (ktype, []), dummy)
adamc@12:         val c = List.foldr (fn (c', c) => (L'.CConcat (c', c), dummy)) c others
adamc@12:         val c = List.foldr (fn ((c', _), c) => (L'.CConcat (c', c), dummy)) c unifs
adamc@12:     in
adamc@12:         (L'.CConcat ((L'.CRecord (ktype, fields), dummy), c), dummy)
adamc@12:     end
adamc@12: 
adamc@12: fun p_summary env s = p_con env (summaryToCon s)
adamc@12: 
adamc@12: exception CUnify of L'.con * L'.con * cunify_error
adamc@12: 
adamc@12: fun hnormKind (kAll as (k, _)) =
adamc@12:     case k of
adamc@76:         L'.KUnif (_, _, ref (SOME k)) => hnormKind k
adamc@12:       | _ => kAll
adamc@12: 
adamc@12: fun kindof env (c, loc) =
adamc@12:     case c of
adamc@12:         L'.TFun _ => ktype
adamc@12:       | L'.TCFun _ => ktype
adamc@85:       | L'.TDisjoint _ => ktype
adamc@12:       | L'.TRecord _ => ktype
adamc@12: 
adamc@12:       | L'.CRel xn => #2 (E.lookupCRel env xn)
adamc@12:       | L'.CNamed xn => #2 (E.lookupCNamed env xn)
adamc@34:       | L'.CModProj (n, ms, x) =>
adamc@34:         let
adamc@34:             val (_, sgn) = E.lookupStrNamed env n
adamc@34:             val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@34:                                        case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@34:                                            NONE => raise Fail "kindof: Unknown substructure"
adamc@34:                                          | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@34:                              ((L'.StrVar n, loc), sgn) ms
adamc@34:         in
adamc@34:             case E.projectCon env {sgn = sgn, str = str, field = x} of
adamc@34:                 NONE => raise Fail "kindof: Unknown con in structure"
adamc@34:               | SOME (k, _) => k
adamc@34:         end
adamc@34: 
adamc@12:       | L'.CApp (c, _) =>
adamc@12:         (case #1 (hnormKind (kindof env c)) of
adamc@12:              L'.KArrow (_, k) => k
adamc@12:            | L'.KError => kerror
adamc@12:            | _ => raise CUnify' (CKindof c))
adamc@12:       | L'.CAbs (x, k, c) => (L'.KArrow (k, kindof (E.pushCRel env x k) c), loc)
adamc@84:       | L'.CDisjoint (_, _, c) => kindof env c
adamc@12: 
adamc@12:       | L'.CName _ => kname
adamc@12: 
adamc@12:       | L'.CRecord (k, _) => (L'.KRecord k, loc)
adamc@12:       | L'.CConcat (c, _) => kindof env c
adamc@67:       | L'.CFold (dom, ran) => foldKind (dom, ran, loc)
adamc@12: 
adamc@82:       | L'.CUnit => (L'.KUnit, loc)
adamc@82: 
adamc@12:       | L'.CError => kerror
adamc@76:       | L'.CUnif (_, k, _, _) => k
adamc@12: 
adamc@86: fun hnormCon (env, denv) c =
adamc@86:     let
adamc@86:         val cAll as (c, loc) = ElabOps.hnormCon env c
adamc@86: 
adamc@86:         fun doDisj (c1, c2, c) =
adamc@86:             let
adamc@86:                 val (c, gs) = hnormCon (env, denv) c
adamc@86:             in
adamc@86:                 (c,
adamc@86:                  map (fn cs => (loc, env, denv, cs)) (D.prove env denv (c1, c2, loc)) @ gs)
adamc@86:             end
adamc@86:     in
adamc@86:         case c of
adamc@86:             L'.CDisjoint cs => doDisj cs
adamc@86:           | L'.TDisjoint cs => doDisj cs
adamc@86:           | _ => (cAll, [])
adamc@86:     end
adamc@86: 
adamc@86: fun unifyRecordCons (env, denv) (c1, c2) =
adamc@12:     let
adamc@12:         val k1 = kindof env c1
adamc@12:         val k2 = kindof env c2
adamc@86: 
adamc@86:         val (r1, gs1) = recordSummary (env, denv) c1
adamc@86:         val (r2, gs2) = recordSummary (env, denv) c2
adamc@12:     in
adamc@12:         unifyKinds k1 k2;
adamc@86:         unifySummaries (env, denv) (k1, r1, r2);
adamc@86:         gs1 @ gs2
adamc@12:     end
adamc@12: 
adamc@86: and recordSummary (env, denv) c =
adamc@86:     let
adamc@86:         val (c, gs) = hnormCon (env, denv) c
adamc@12: 
adamc@86:         val (sum, gs') =
adamc@86:             case c of
adamc@86:                 (L'.CRecord (_, xcs), _) => ({fields = xcs, unifs = [], others = []}, [])
adamc@86:               | (L'.CConcat (c1, c2), _) =>
adamc@86:                 let
adamc@86:                     val (s1, gs1) = recordSummary (env, denv) c1
adamc@86:                     val (s2, gs2) = recordSummary (env, denv) c2
adamc@86:                 in
adamc@86:                     ({fields = #fields s1 @ #fields s2,
adamc@86:                       unifs = #unifs s1 @ #unifs s2,
adamc@86:                       others = #others s1 @ #others s2},
adamc@86:                      gs1 @ gs2)
adamc@86:                 end
adamc@86:               | (L'.CUnif (_, _, _, ref (SOME c)), _) => recordSummary (env, denv) c
adamc@86:               | c' as (L'.CUnif (_, _, _, r), _) => ({fields = [], unifs = [(c', r)], others = []}, [])
adamc@86:               | c' => ({fields = [], unifs = [], others = [c']}, [])
adamc@86:     in
adamc@86:         (sum, gs @ gs')
adamc@86:     end
adamc@86: 
adamc@86: and consEq (env, denv) (c1, c2) =
adamc@86:     (case unifyCons (env, denv) c1 c2 of
adamc@86:          [] => true
adamc@86:        | _ => false)
adamc@12:     handle CUnify _ => false
adamc@12: 
adamc@80: and consNeq env (c1, c2) =
adamc@86:     case (#1 (ElabOps.hnormCon env c1), #1 (ElabOps.hnormCon env c2)) of
adamc@80:         (L'.CName x1, L'.CName x2) => x1 <> x2
adamc@80:       | _ => false
adamc@80: 
adamc@86: and unifySummaries (env, denv) (k, s1 : record_summary, s2 : record_summary) =
adamc@12:     let
adamc@14:         (*val () = eprefaces "Summaries" [("#1", p_summary env s1),
adamc@14:                                           ("#2", p_summary env s2)]*)
adamc@12: 
adamc@12:         fun eatMatching p (ls1, ls2) =
adamc@12:             let
adamc@12:                 fun em (ls1, ls2, passed1) =
adamc@12:                     case ls1 of
adamc@12:                         [] => (rev passed1, ls2)
adamc@12:                       | h1 :: t1 =>
adamc@12:                         let
adamc@12:                             fun search (ls2', passed2) =
adamc@12:                                 case ls2' of
adamc@12:                                     [] => em (t1, ls2, h1 :: passed1)
adamc@12:                                   | h2 :: t2 =>
adamc@12:                                     if p (h1, h2) then
adamc@12:                                         em (t1, List.revAppend (passed2, t2), passed1)
adamc@12:                                     else
adamc@12:                                         search (t2, h2 :: passed2)
adamc@12:                         in
adamc@12:                             search (ls2, [])
adamc@12:                         end
adamc@12:             in
adamc@12:                 em (ls1, ls2, [])
adamc@12:             end
adamc@12: 
adamc@12:         val (fs1, fs2) = eatMatching (fn ((x1, c1), (x2, c2)) =>
adamc@80:                                          not (consNeq env (x1, x2))
adamc@86:                                          andalso consEq (env, denv) (c1, c2)
adamc@86:                                          andalso consEq (env, denv) (x1, x2))
adamc@79:                                      (#fields s1, #fields s2)
adamc@14:         (*val () = eprefaces "Summaries2" [("#1", p_summary env {fields = fs1, unifs = #unifs s1, others = #others s1}),
adamc@14:                                            ("#2", p_summary env {fields = fs2, unifs = #unifs s2, others = #others s2})]*)
adamc@12:         val (unifs1, unifs2) = eatMatching (fn ((_, r1), (_, r2)) => r1 = r2) (#unifs s1, #unifs s2)
adamc@86:         val (others1, others2) = eatMatching (consEq (env, denv)) (#others s1, #others s2)
adamc@12: 
adamc@12:         fun unifFields (fs, others, unifs) =
adamc@12:             case (fs, others, unifs) of
adamc@12:                 ([], [], _) => ([], [], unifs)
adamc@12:               | (_, _, []) => (fs, others, [])
adamc@12:               | (_, _, (_, r) :: rest) =>
adamc@12:                 let
adamc@12:                     val r' = ref NONE
adamc@76:                     val cr' = (L'.CUnif (dummy, k, "recd", r'), dummy)
adamc@12: 
adamc@12:                     val prefix = case (fs, others) of
adamc@12:                                      ([], other :: others) =>
adamc@12:                                      List.foldl (fn (other, c) =>
adamc@12:                                                     (L'.CConcat (c, other), dummy))
adamc@12:                                                 other others
adamc@12:                                    | (fs, []) =>
adamc@12:                                      (L'.CRecord (k, fs), dummy)
adamc@12:                                    | (fs, others) =>
adamc@12:                                      List.foldl (fn (other, c) =>
adamc@12:                                                     (L'.CConcat (c, other), dummy))
adamc@12:                                                 (L'.CRecord (k, fs), dummy) others
adamc@12:                 in
adamc@12:                     r := SOME (L'.CConcat (prefix, cr'), dummy);
adamc@12:                     ([], [], (cr', r') :: rest)
adamc@12:                 end
adamc@12: 
adamc@12:         val (fs1, others1, unifs2) = unifFields (fs1, others1, unifs2)
adamc@12:         val (fs2, others2, unifs1) = unifFields (fs2, others2, unifs1)
adamc@12: 
adamc@86:         val clear = case (fs1, others1, fs2, others2) of
adamc@86:                          ([], [], [], []) => true
adamc@12:                        | _ => false
adamc@12:         val empty = (L'.CRecord (k, []), dummy)
adamc@12:         fun pairOffUnifs (unifs1, unifs2) =
adamc@12:             case (unifs1, unifs2) of
adamc@12:                 ([], _) =>
adamc@86:                 if clear then
adamc@12:                     List.app (fn (_, r) => r := SOME empty) unifs2
adamc@12:                 else
adamc@12:                     raise CUnify' CRecordFailure
adamc@12:               | (_, []) =>
adamc@86:                 if clear then
adamc@12:                     List.app (fn (_, r) => r := SOME empty) unifs1
adamc@12:                 else
adamc@12:                     raise CUnify' CRecordFailure
adamc@12:               | ((c1, _) :: rest1, (_, r2) :: rest2) =>
adamc@12:                 (r2 := SOME c1;
adamc@12:                  pairOffUnifs (rest1, rest2))
adamc@12:     in
adamc@12:         pairOffUnifs (unifs1, unifs2)
adamc@12:     end
adamc@12: 
adamc@86: and unifyCons' (env, denv) c1 c2 =
adamc@86:     let
adamc@86:         val (c1, gs1) = hnormCon (env, denv) c1
adamc@86:         val (c2, gs2) = hnormCon (env, denv) c2
adamc@86:     in
adamc@86:         unifyCons'' (env, denv) c1 c2;
adamc@86:         gs1 @ gs2
adamc@86:     end
adamc@11:     
adamc@86: and unifyCons'' (env, denv) (c1All as (c1, _)) (c2All as (c2, _)) =
adamc@10:     let
adamc@10:         fun err f = raise CUnify' (f (c1All, c2All))
adamc@12: 
adamc@86:         fun isRecord () = unifyRecordCons (env, denv) (c1All, c2All)
adamc@10:     in
adamc@10:         case (c1, c2) of
adamc@88:             (L'.CUnit, L'.CUnit) => []
adamc@88: 
adamc@88:           | (L'.TFun (d1, r1), L'.TFun (d2, r2)) =>
adamc@86:             unifyCons' (env, denv) d1 d2
adamc@86:             @ unifyCons' (env, denv) r1 r2
adamc@10:           | (L'.TCFun (expl1, x1, d1, r1), L'.TCFun (expl2, _, d2, r2)) =>
adamc@10:             if expl1 <> expl2 then
adamc@10:                 err CExplicitness
adamc@10:             else
adamc@10:                 (unifyKinds d1 d2;
adamc@86:                  unifyCons' (E.pushCRel env x1 d1, D.enter denv) r1 r2)
adamc@86:           | (L'.TRecord r1, L'.TRecord r2) => unifyCons' (env, denv) r1 r2
adamc@10: 
adamc@10:           | (L'.CRel n1, L'.CRel n2) =>
adamc@10:             if n1 = n2 then
adamc@86:                 []
adamc@10:             else
adamc@10:                 err CIncompatible
adamc@10:           | (L'.CNamed n1, L'.CNamed n2) =>
adamc@10:             if n1 = n2 then
adamc@86:                 []
adamc@10:             else
adamc@10:                 err CIncompatible
adamc@10: 
adamc@10:           | (L'.CApp (d1, r1), L'.CApp (d2, r2)) =>
adamc@86:             (unifyCons' (env, denv) d1 d2;
adamc@86:              unifyCons' (env, denv) r1 r2)
adamc@10:           | (L'.CAbs (x1, k1, c1), L'.CAbs (_, k2, c2)) =>
adamc@10:             (unifyKinds k1 k2;
adamc@86:              unifyCons' (E.pushCRel env x1 k1, D.enter denv) c1 c2)
adamc@10: 
adamc@10:           | (L'.CName n1, L'.CName n2) =>
adamc@10:             if n1 = n2 then
adamc@86:                 []
adamc@10:             else
adamc@10:                 err CIncompatible
adamc@10: 
adamc@34:           | (L'.CModProj (n1, ms1, x1), L'.CModProj (n2, ms2, x2)) =>
adamc@34:             if n1 = n2 andalso ms1 = ms2 andalso x1 = x2 then
adamc@86:                 []
adamc@34:             else
adamc@34:                 err CIncompatible
adamc@34: 
adamc@86:           | (L'.CError, _) => []
adamc@86:           | (_, L'.CError) => []
adamc@10: 
adamc@86:           | (L'.CUnif (_, _, _, ref (SOME c1All)), _) => unifyCons' (env, denv) c1All c2All
adamc@86:           | (_, L'.CUnif (_, _, _, ref (SOME c2All))) => unifyCons' (env, denv) c1All c2All
adamc@10: 
adamc@76:           | (L'.CUnif (_, k1, _, r1), L'.CUnif (_, k2, _, r2)) =>
adamc@10:             if r1 = r2 then
adamc@86:                 []
adamc@10:             else
adamc@10:                 (unifyKinds k1 k2;
adamc@86:                  r1 := SOME c2All;
adamc@86:                  [])
adamc@10: 
adamc@76:           | (L'.CUnif (_, _, _, r), _) =>
adamc@10:             if occursCon r c2All then
adamc@10:                 err COccursCheckFailed
adamc@10:             else
adamc@86:                 (r := SOME c2All;
adamc@86:                  [])
adamc@76:           | (_, L'.CUnif (_, _, _, r)) =>
adamc@10:             if occursCon r c1All then
adamc@10:                 err COccursCheckFailed
adamc@10:             else
adamc@86:                 (r := SOME c1All;
adamc@86:                  [])
adamc@10: 
adamc@12:           | (L'.CRecord _, _) => isRecord ()
adamc@12:           | (_, L'.CRecord _) => isRecord ()
adamc@12:           | (L'.CConcat _, _) => isRecord ()
adamc@12:           | (_, L'.CConcat _) => isRecord ()
adamc@12: 
adamc@71:           | (L'.CFold (dom1, ran1), L'.CFold (dom2, ran2)) =>
adamc@71:             (unifyKinds dom1 dom2;
adamc@86:              unifyKinds ran1 ran2;
adamc@86:              [])
adamc@71: 
adamc@10:           | _ => err CIncompatible
adamc@10:     end
adamc@10: 
adamc@86: and unifyCons (env, denv) c1 c2 =
adamc@86:     unifyCons' (env, denv) c1 c2
adamc@10:     handle CUnify' err => raise CUnify (c1, c2, err)
adamc@10:          | KUnify args => raise CUnify (c1, c2, CKind args)
adamc@10: 
adamc@10: datatype exp_error =
adamc@10:        UnboundExp of ErrorMsg.span * string
adamc@34:      | UnboundStrInExp of ErrorMsg.span * string
adamc@10:      | Unify of L'.exp * L'.con * L'.con * cunify_error
adamc@11:      | Unif of string * L'.con
adamc@11:      | WrongForm of string * L'.exp * L'.con
adamc@10: 
adamc@10: fun expError env err =
adamc@10:     case err of
adamc@10:         UnboundExp (loc, s) =>
adamc@10:         ErrorMsg.errorAt loc ("Unbound expression variable " ^ s)
adamc@34:       | UnboundStrInExp (loc, s) =>
adamc@34:         ErrorMsg.errorAt loc ("Unbound structure " ^ s)
adamc@10:       | Unify (e, c1, c2, uerr) =>
adamc@10:         (ErrorMsg.errorAt (#2 e) "Unification failure";
adamc@10:          eprefaces' [("Expression", p_exp env e),
adamc@10:                      ("Have con", p_con env c1),
adamc@10:                      ("Need con", p_con env c2)];
adamc@10:          cunifyError env uerr)
adamc@11:       | Unif (action, c) =>
adamc@11:         (ErrorMsg.errorAt (#2 c) ("Unification variable blocks " ^ action);
adamc@11:          eprefaces' [("Con", p_con env c)])
adamc@11:       | WrongForm (variety, e, t) =>
adamc@11:         (ErrorMsg.errorAt (#2 e) ("Expression is not a " ^ variety);
adamc@11:          eprefaces' [("Expression", p_exp env e),
adamc@11:                      ("Type", p_con env t)])
adamc@10: 
adamc@86: fun checkCon (env, denv) e c1 c2 =
adamc@86:     unifyCons (env, denv) c1 c2
adamc@10:     handle CUnify (c1, c2, err) =>
adamc@86:            (expError env (Unify (e, c1, c2, err));
adamc@86:             [])
adamc@10: 
adamc@14: fun primType env p =
adamc@56:     case p of
adamc@56:         P.Int _ => !int
adamc@56:       | P.Float _ => !float
adamc@56:       | P.String _ => !string
adamc@14: 
adamc@71: fun recCons (k, nm, v, rest, loc) =
adamc@71:     (L'.CConcat ((L'.CRecord (k, [(nm, v)]), loc),
adamc@71:                  rest), loc)
adamc@71: 
adamc@71: fun foldType (dom, loc) =
adamc@71:     (L'.TCFun (L'.Explicit, "ran", (L'.KArrow ((L'.KRecord dom, loc), (L'.KType, loc)), loc),
adamc@71:                (L'.TFun ((L'.TCFun (L'.Explicit, "nm", (L'.KName, loc),
adamc@71:                                     (L'.TCFun (L'.Explicit, "v", dom,
adamc@71:                                                (L'.TCFun (L'.Explicit, "rest", (L'.KRecord dom, loc),
adamc@71:                                                           (L'.TFun ((L'.CApp ((L'.CRel 3, loc), (L'.CRel 0, loc)), loc),
adamc@71:                                                                     (L'.CApp ((L'.CRel 3, loc),
adamc@71:                                                                               recCons (dom,
adamc@71:                                                                                        (L'.CRel 2, loc),
adamc@71:                                                                                        (L'.CRel 1, loc),
adamc@71:                                                                                        (L'.CRel 0, loc),
adamc@71:                                                                                        loc)), loc)), loc)),
adamc@71:                                                 loc)), loc)), loc),
adamc@71:                          (L'.TFun ((L'.CApp ((L'.CRel 0, loc), (L'.CRecord (dom, []), loc)), loc),
adamc@71:                                    (L'.TCFun (L'.Explicit, "r", (L'.KRecord dom, loc),
adamc@71:                                               (L'.CApp ((L'.CRel 1, loc), (L'.CRel 0, loc)), loc)), loc)),
adamc@71:                           loc)), loc)), loc)
adamc@71: 
adamc@15: fun typeof env (e, loc) =
adamc@15:     case e of
adamc@56:         L'.EPrim p => primType env p
adamc@15:       | L'.ERel n => #2 (E.lookupERel env n)
adamc@15:       | L'.ENamed n => #2 (E.lookupENamed env n)
adamc@34:       | L'.EModProj (n, ms, x) =>
adamc@34:         let
adamc@34:             val (_, sgn) = E.lookupStrNamed env n
adamc@34:             val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@34:                                        case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@34:                                            NONE => raise Fail "kindof: Unknown substructure"
adamc@34:                                          | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@34:                              ((L'.StrVar n, loc), sgn) ms
adamc@34:         in
adamc@34:             case E.projectVal env {sgn = sgn, str = str, field = x} of
adamc@34:                 NONE => raise Fail "typeof: Unknown val in structure"
adamc@34:               | SOME t => t
adamc@34:         end
adamc@34: 
adamc@15:       | L'.EApp (e1, _) =>
adamc@15:         (case #1 (typeof env e1) of
adamc@15:              L'.TFun (_, c) => c
adamc@15:            | _ => raise Fail "typeof: Bad EApp")
adamc@26:       | L'.EAbs (_, _, ran, _) => ran
adamc@15:       | L'.ECApp (e1, c) =>
adamc@15:         (case #1 (typeof env e1) of
adamc@15:              L'.TCFun (_, _, _, c1) => subConInCon (0, c) c1
adamc@15:            | _ => raise Fail "typeof: Bad ECApp")
adamc@15:       | L'.ECAbs (expl, x, k, e1) => (L'.TCFun (expl, x, k, typeof (E.pushCRel env x k) e1), loc)
adamc@15: 
adamc@29:       | L'.ERecord xes => (L'.TRecord (L'.CRecord (ktype, map (fn (x, _, t) => (x, t)) xes), loc), loc)
adamc@15:       | L'.EField (_, _, {field, ...}) => field
adamc@71:       | L'.EFold dom => foldType (dom, loc)
adamc@15: 
adamc@15:       | L'.EError => cerror
adamc@15: 
adamc@86: fun elabHead (env, denv) (e as (_, loc)) t =
adamc@15:     let
adamc@15:         fun unravel (t, e) =
adamc@86:             let
adamc@86:                 val (t, gs) = hnormCon (env, denv) t
adamc@86:             in
adamc@86:                 case t of
adamc@86:                     (L'.TCFun (L'.Implicit, x, k, t'), _) =>
adamc@86:                     let
adamc@86:                         val u = cunif (loc, k)
adamc@86: 
adamc@86:                         val (e, t, gs') = unravel (subConInCon (0, u) t',
adamc@86:                                                    (L'.ECApp (e, u), loc))
adamc@86:                     in
adamc@86:                         (e, t, gs @ gs')
adamc@86:                     end
adamc@86:                   | _ => (e, t, gs)
adamc@86:             end
adamc@15:     in
adamc@15:         unravel (t, e)
adamc@15:     end
adamc@15: 
adamc@83: fun elabExp (env, denv) (e, loc) =
adamc@10:     case e of
adamc@10:         L.EAnnot (e, t) =>
adamc@10:         let
adamc@83:             val (e', et, gs1) = elabExp (env, denv) e
adamc@83:             val (t', _, gs2) = elabCon (env, denv) t
adamc@86:             val gs3 = checkCon (env, denv) e' et t'
adamc@10:         in
adamc@86:             (e', t', gs1 @ gs2 @ gs3)
adamc@10:         end
adamc@10: 
adamc@83:       | L.EPrim p => ((L'.EPrim p, loc), primType env p, [])
adamc@34:       | L.EVar ([], s) =>
adamc@10:         (case E.lookupE env s of
adamc@10:              E.NotBound =>
adamc@10:              (expError env (UnboundExp (loc, s));
adamc@83:               (eerror, cerror, []))
adamc@83:            | E.Rel (n, t) => ((L'.ERel n, loc), t, [])
adamc@83:            | E.Named (n, t) => ((L'.ENamed n, loc), t, []))
adamc@34:       | L.EVar (m1 :: ms, s) =>
adamc@34:         (case E.lookupStr env m1 of
adamc@42:              NONE => (expError env (UnboundStrInExp (loc, m1));
adamc@83:                       (eerror, cerror, []))
adamc@34:            | SOME (n, sgn) =>
adamc@34:              let
adamc@34:                  val (str, sgn) = foldl (fn (m, (str, sgn)) =>
adamc@34:                                      case E.projectStr env {sgn = sgn, str = str, field = m} of
adamc@34:                                          NONE => (conError env (UnboundStrInCon (loc, m));
adamc@34:                                                   (strerror, sgnerror))
adamc@34:                                        | SOME sgn => ((L'.StrProj (str, m), loc), sgn))
adamc@34:                                   ((L'.StrVar n, loc), sgn) ms
adamc@34: 
adamc@34:                  val t = case E.projectVal env {sgn = sgn, str = str, field = s} of
adamc@34:                              NONE => (expError env (UnboundExp (loc, s));
adamc@34:                                       cerror)
adamc@34:                            | SOME t => t
adamc@34:              in
adamc@83:                  ((L'.EModProj (n, ms, s), loc), t, [])
adamc@34:              end)
adamc@34: 
adamc@10:       | L.EApp (e1, e2) =>
adamc@10:         let
adamc@83:             val (e1', t1, gs1) = elabExp (env, denv) e1
adamc@86:             val (e1', t1, gs2) = elabHead (env, denv) e1' t1
adamc@86:             val (e2', t2, gs3) = elabExp (env, denv) e2
adamc@10: 
adamc@76:             val dom = cunif (loc, ktype)
adamc@76:             val ran = cunif (loc, ktype)
adamc@10:             val t = (L'.TFun (dom, ran), dummy)
adamc@86: 
adamc@86:             val gs4 = checkCon (env, denv) e1' t1 t
adamc@86:             val gs5 = checkCon (env, denv) e2' t2 dom
adamc@10:         in
adamc@86:             ((L'.EApp (e1', e2'), loc), ran, gs1 @ gs2 @ gs3 @ gs4 @ gs5)
adamc@10:         end
adamc@10:       | L.EAbs (x, to, e) =>
adamc@10:         let
adamc@83:             val (t', gs1) = case to of
adamc@83:                                 NONE => (cunif (loc, ktype), [])
adamc@83:                               | SOME t =>
adamc@83:                                 let
adamc@83:                                     val (t', tk, gs) = elabCon (env, denv) t
adamc@83:                                 in
adamc@83:                                     checkKind env t' tk ktype;
adamc@83:                                     (t', gs)
adamc@83:                                 end
adamc@83:             val (e', et, gs2) = elabExp (E.pushERel env x t', denv) e
adamc@10:         in
adamc@26:             ((L'.EAbs (x, t', et, e'), loc),
adamc@83:              (L'.TFun (t', et), loc),
adamc@83:              gs1 @ gs2)
adamc@10:         end
adamc@10:       | L.ECApp (e, c) =>
adamc@10:         let
adamc@83:             val (e', et, gs1) = elabExp (env, denv) e
adamc@86:             val (e', et, gs2) = elabHead (env, denv) e' et
adamc@86:             val (c', ck, gs3) = elabCon (env, denv) c
adamc@86:             val ((et', _), gs4) = hnormCon (env, denv) et
adamc@10:         in
adamc@86:             case et' of
adamc@83:                 L'.CError => (eerror, cerror, [])
adamc@11:               | L'.TCFun (_, _, k, eb) =>
adamc@11:                 let
adamc@11:                     val () = checkKind env c' ck k
adamc@11:                     val eb' = subConInCon (0, c') eb
adamc@11:                               handle SynUnif => (expError env (Unif ("substitution", eb));
adamc@11:                                                  cerror)
adamc@11:                 in
adamc@86:                     ((L'.ECApp (e', c'), loc), eb', gs1 @ gs2 @ gs3 @ gs4)
adamc@11:                 end
adamc@11: 
adamc@11:               | L'.CUnif _ =>
adamc@11:                 (expError env (Unif ("application", et));
adamc@83:                  (eerror, cerror, []))
adamc@11: 
adamc@11:               | _ =>
adamc@11:                 (expError env (WrongForm ("constructor function", e', et));
adamc@83:                  (eerror, cerror, []))
adamc@10:         end
adamc@11:       | L.ECAbs (expl, x, k, e) =>
adamc@11:         let
adamc@11:             val expl' = elabExplicitness expl
adamc@11:             val k' = elabKind k
adamc@83:             val (e', et, gs) = elabExp (E.pushCRel env x k', D.enter denv) e
adamc@11:         in
adamc@11:             ((L'.ECAbs (expl', x, k', e'), loc),
adamc@83:              (L'.TCFun (expl', x, k', et), loc),
adamc@83:              gs)
adamc@11:         end
adamc@6: 
adamc@85:       | L.EDisjoint (c1, c2, e) =>
adamc@85:         let
adamc@85:             val (c1', k1, gs1) = elabCon (env, denv) c1
adamc@85:             val (c2', k2, gs2) = elabCon (env, denv) c2
adamc@85: 
adamc@85:             val ku1 = kunif loc
adamc@85:             val ku2 = kunif loc
adamc@85: 
adamc@85:             val denv' = D.assert env denv (c1', c2')
adamc@85:             val (e', t, gs3) = elabExp (env, denv') e
adamc@85:         in
adamc@85:             checkKind env c1' k1 (L'.KRecord ku1, loc);
adamc@85:             checkKind env c2' k2 (L'.KRecord ku2, loc);
adamc@85: 
adamc@85:             (e', (L'.TDisjoint (c1', c2', t), loc), gs1 @ gs2 @ gs3)
adamc@85:         end
adamc@85: 
adamc@12:       | L.ERecord xes =>
adamc@12:         let
adamc@83:             val (xes', gs) = ListUtil.foldlMap (fn ((x, e), gs) =>
adamc@83:                                                    let
adamc@83:                                                        val (x', xk, gs1) = elabCon (env, denv) x
adamc@83:                                                        val (e', et, gs2) = elabExp (env, denv) e
adamc@83:                                                    in
adamc@83:                                                        checkKind env x' xk kname;
adamc@83:                                                        ((x', e', et), gs1 @ gs2 @ gs)
adamc@83:                                                    end)
adamc@83:                                                [] xes
adamc@86: 
adamc@86:             val k = (L'.KType, loc)
adamc@86: 
adamc@86:             fun prove (xets, gs) =
adamc@86:                 case xets of
adamc@86:                     [] => gs
adamc@86:                   | (x, _, t) :: rest =>
adamc@86:                     let
adamc@86:                         val xc = (x, t)
adamc@86:                         val r1 = (L'.CRecord (k, [xc]), loc)
adamc@86:                         val gs = foldl (fn ((x', _, t'), gs) =>
adamc@86:                                            let
adamc@86:                                                val xc' = (x', t')
adamc@86:                                                val r2 = (L'.CRecord (k, [xc']), loc)
adamc@86:                                            in
adamc@86:                                                map (fn cs => (loc, env, denv, cs)) (D.prove env denv (r1, r2, loc))
adamc@86:                                                @ gs
adamc@86:                                            end)
adamc@86:                                  gs rest
adamc@86:                     in
adamc@86:                         prove (rest, gs)
adamc@86:                     end
adamc@12:         in
adamc@29:             ((L'.ERecord xes', loc),
adamc@83:              (L'.TRecord (L'.CRecord (ktype, map (fn (x', _, et) => (x', et)) xes'), loc), loc),
adamc@86:              prove (xes', gs))
adamc@12:         end
adamc@12: 
adamc@12:       | L.EField (e, c) =>
adamc@12:         let
adamc@83:             val (e', et, gs1) = elabExp (env, denv) e
adamc@83:             val (c', ck, gs2) = elabCon (env, denv) c
adamc@12: 
adamc@76:             val ft = cunif (loc, ktype)
adamc@76:             val rest = cunif (loc, ktype_record)
adamc@86:             val first = (L'.CRecord (ktype, [(c', ft)]), loc)
adamc@86:                        
adamc@86:             val gs3 =
adamc@86:                 checkCon (env, denv) e' et
adamc@86:                          (L'.TRecord (L'.CConcat (first, rest), loc), loc)
adamc@86:             val gs4 =
adamc@86:                 map (fn cs => (loc, env, denv, cs))
adamc@86:                 (D.prove env denv (first, rest, loc))
adamc@12:         in
adamc@86:             ((L'.EField (e', c', {field = ft, rest = rest}), loc), ft, gs1 @ gs2 @ gs3 @ gs4)
adamc@12:         end
adamc@71: 
adamc@71:       | L.EFold =>
adamc@71:         let
adamc@76:             val dom = kunif loc
adamc@71:         in
adamc@83:             ((L'.EFold dom, loc), foldType (dom, loc), [])
adamc@71:         end
adamc@12:             
adamc@12: 
adamc@6: datatype decl_error =
adamc@76:          KunifsRemain of ErrorMsg.span
adamc@76:        | CunifsRemain of ErrorMsg.span
adamc@6: 
adamc@6: fun declError env err =
adamc@6:     case err of
adamc@76:         KunifsRemain loc =>
adamc@76:         ErrorMsg.errorAt loc "Some kind unification variables are undetermined in declaration"
adamc@76:       | CunifsRemain loc =>
adamc@76:         ErrorMsg.errorAt loc "Some constructor unification variables are undetermined in declaration"
adamc@6: 
adamc@31: datatype sgn_error =
adamc@31:          UnboundSgn of ErrorMsg.span * string
adamc@31:        | UnmatchedSgi of L'.sgn_item
adamc@31:        | SgiWrongKind of L'.sgn_item * L'.kind * L'.sgn_item * L'.kind * kunify_error
adamc@31:        | SgiWrongCon of L'.sgn_item * L'.con * L'.sgn_item * L'.con * cunify_error
adamc@41:        | SgnWrongForm of L'.sgn * L'.sgn
adamc@42:        | UnWhereable of L'.sgn * string
adamc@75:        | WhereWrongKind of L'.kind * L'.kind * kunify_error
adamc@58:        | NotIncludable of L'.sgn
adamc@62:        | DuplicateCon of ErrorMsg.span * string
adamc@62:        | DuplicateVal of ErrorMsg.span * string
adamc@62:        | DuplicateSgn of ErrorMsg.span * string
adamc@62:        | DuplicateStr of ErrorMsg.span * string
adamc@88:        | NotConstraintsable of L'.sgn
adamc@31: 
adamc@31: fun sgnError env err =
adamc@31:     case err of
adamc@31:         UnboundSgn (loc, s) =>
adamc@31:         ErrorMsg.errorAt loc ("Unbound signature variable " ^ s)
adamc@31:       | UnmatchedSgi (sgi as (_, loc)) =>
adamc@31:         (ErrorMsg.errorAt loc "Unmatched signature item";
adamc@31:          eprefaces' [("Item", p_sgn_item env sgi)])
adamc@31:       | SgiWrongKind (sgi1, k1, sgi2, k2, kerr) =>
adamc@31:         (ErrorMsg.errorAt (#2 sgi1) "Kind unification failure in signature matching:";
adamc@59:          eprefaces' [("Have", p_sgn_item env sgi1),
adamc@59:                      ("Need", p_sgn_item env sgi2),
adamc@31:                      ("Kind 1", p_kind k1),
adamc@31:                      ("Kind 2", p_kind k2)];
adamc@31:          kunifyError kerr)
adamc@31:       | SgiWrongCon (sgi1, c1, sgi2, c2, cerr) =>
adamc@31:         (ErrorMsg.errorAt (#2 sgi1) "Constructor unification failure in signature matching:";
adamc@59:          eprefaces' [("Have", p_sgn_item env sgi1),
adamc@59:                      ("Need", p_sgn_item env sgi2),
adamc@31:                      ("Con 1", p_con env c1),
adamc@31:                      ("Con 2", p_con env c2)];
adamc@31:          cunifyError env cerr)
adamc@41:       | SgnWrongForm (sgn1, sgn2) =>
adamc@41:         (ErrorMsg.errorAt (#2 sgn1) "Incompatible signatures:";
adamc@41:          eprefaces' [("Sig 1", p_sgn env sgn1),
adamc@41:                      ("Sig 2", p_sgn env sgn2)])
adamc@42:       | UnWhereable (sgn, x) =>
adamc@42:         (ErrorMsg.errorAt (#2 sgn) "Unavailable field for 'where'";
adamc@42:          eprefaces' [("Signature", p_sgn env sgn),
adamc@42:                      ("Field", PD.string x)])
adamc@75:       | WhereWrongKind (k1, k2, kerr) =>
adamc@75:         (ErrorMsg.errorAt (#2 k1) "Wrong kind for 'where'";
adamc@75:          eprefaces' [("Have", p_kind k1),
adamc@75:                      ("Need", p_kind k2)];
adamc@75:          kunifyError kerr)
adamc@58:       | NotIncludable sgn =>
adamc@58:         (ErrorMsg.errorAt (#2 sgn) "Invalid signature to 'include'";
adamc@58:          eprefaces' [("Signature", p_sgn env sgn)])
adamc@62:       | DuplicateCon (loc, s) =>
adamc@62:         ErrorMsg.errorAt loc ("Duplicate constructor " ^ s ^ " in signature")
adamc@62:       | DuplicateVal (loc, s) =>
adamc@62:         ErrorMsg.errorAt loc ("Duplicate value " ^ s ^ " in signature")
adamc@62:       | DuplicateSgn (loc, s) =>
adamc@62:         ErrorMsg.errorAt loc ("Duplicate signature " ^ s ^ " in signature")
adamc@62:       | DuplicateStr (loc, s) =>
adamc@62:         ErrorMsg.errorAt loc ("Duplicate structure " ^ s ^ " in signature")
adamc@88:       | NotConstraintsable sgn =>
adamc@88:         (ErrorMsg.errorAt (#2 sgn) "Invalid signature for 'open constraints'";
adamc@88:          eprefaces' [("Signature", p_sgn env sgn)])
adamc@31: 
adamc@31: datatype str_error =
adamc@31:          UnboundStr of ErrorMsg.span * string
adamc@44:        | NotFunctor of L'.sgn
adamc@46:        | FunctorRebind of ErrorMsg.span
adamc@61:        | UnOpenable of L'.sgn
adamc@75:        | NotType of L'.kind * (L'.kind * L'.kind * kunify_error)
adamc@31: 
adamc@31: fun strError env err =
adamc@31:     case err of
adamc@31:         UnboundStr (loc, s) =>
adamc@31:         ErrorMsg.errorAt loc ("Unbound structure variable " ^ s)
adamc@44:       | NotFunctor sgn =>
adamc@44:         (ErrorMsg.errorAt (#2 sgn) "Application of non-functor";
adamc@44:          eprefaces' [("Signature", p_sgn env sgn)])
adamc@46:       | FunctorRebind loc =>
adamc@46:         ErrorMsg.errorAt loc "Attempt to rebind functor"
adamc@61:       | UnOpenable sgn =>
adamc@61:         (ErrorMsg.errorAt (#2 sgn) "Un-openable structure";
adamc@61:          eprefaces' [("Signature", p_sgn env sgn)])
adamc@75:       | NotType (k, (k1, k2, ue)) =>
adamc@75:         (ErrorMsg.errorAt (#2 k) "'val' type kind is not 'Type'";
adamc@75:          eprefaces' [("Kind", p_kind k),
adamc@75:                      ("Subkind 1", p_kind k1),
adamc@75:                      ("Subkind 2", p_kind k2)];
adamc@75:          kunifyError ue)
adamc@31: 
adamc@42: val hnormSgn = E.hnormSgn
adamc@31: 
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@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@76:         in
adamc@76:             (unifyKinds ck ktype
adamc@76:              handle KUnify ue => strError env (NotType (ck, ue)));
adamc@31: 
adamc@88:             ([(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@88:             val denv = 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@88:             ([(L'.SgiConstraint (c1', c2'), loc)], (env, denv, gs1 @ gs2))
adamc@76:         end
adamc@31: 
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@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@88:                                 | L'.SgiConstraint _ => (cons, 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@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@66:                                   case sgi of
adamc@66:                                       L'.SgiConAbs (x, n, k) =>
adamc@88:                                       let
adamc@88:                                           val c = (L'.CModProj (str, strs, x), loc)
adamc@88:                                       in
adamc@88:                                           ((L'.DCon (x, n, k, c), loc),
adamc@88:                                            (E.pushCNamedAs env' x n k (SOME c), denv'))
adamc@88:                                       end
adamc@66:                                     | L'.SgiCon (x, n, k, c) =>
adamc@66:                                       ((L'.DCon (x, n, k, (L'.CModProj (str, strs, x), loc)), loc),
adamc@88:                                        (E.pushCNamedAs env' x n k (SOME c), denv'))
adamc@66:                                     | L'.SgiVal (x, n, t) =>
adamc@66:                                       ((L'.DVal (x, n, t, (L'.EModProj (str, strs, x), loc)), loc),
adamc@88:                                        (E.pushENamedAs env' x n t, denv'))
adamc@66:                                     | L'.SgiStr (x, n, sgn) =>
adamc@66:                                       ((L'.DStr (x, n, sgn, (L'.StrProj (m, x), loc)), loc),
adamc@88:                                        (E.pushStrNamedAs env' x n sgn, denv'))
adamc@66:                                     | L'.SgiSgn (x, n, sgn) =>
adamc@66:                                       ((L'.DSgn (x, n, (L'.SgnProj (str, strs, x), loc)), loc),
adamc@88:                                        (E.pushSgnNamedAs env' x n sgn, denv'))
adamc@88:                                     | L'.SgiConstraint (c1, c2) =>
adamc@88:                                       ((L'.DConstraint (c1, c2), loc),
adamc@88:                                        (env', denv (* D.assert env denv (c1, c2) *) )))
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@88:                          | SOME cs => foldl (fn ((c1, c2), denv) => D.assert env denv (c1, c2)) 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@59:         L'.DCon (x, n, k, c) => (L'.SgiCon (x, n, k, c), loc)
adamc@59:       | L'.DVal (x, n, t, _) => (L'.SgiVal (x, n, t), loc)
adamc@59:       | L'.DSgn (x, n, sgn) => (L'.SgiSgn (x, n, sgn), loc)
adamc@59:       | L'.DStr (x, n, sgn, _) => (L'.SgiStr (x, n, sgn), loc)
adamc@59:       | L'.DFfiStr (x, n, sgn) => (L'.SgiStr (x, n, sgn), loc)
adamc@88:       | L'.DConstraint cs => (L'.SgiConstraint cs, loc)
adamc@88: 
adamc@88: fun sgiBindsD (env, denv) (sgi, _) =
adamc@88:     case sgi of
adamc@88:         L'.SgiConstraint (c1, c2) => D.assert env denv (c1, c2)
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@88:             fun folder (sgi2All as (sgi, _), (env, denv)) =
adamc@31:                 let
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@31:                                        | _ => NONE
adamc@31:                                  end)
adamc@31: 
adamc@31:                       | L'.SgiCon (x, n2, k2, c2) =>
adamc@31:                         seek (fn sgi1All as (sgi1, _) =>
adamc@31:                                  case sgi1 of
adamc@41:                                      L'.SgiCon (x', n1, k1, c1) =>
adamc@41:                                      if x = x' then
adamc@41:                                          let
adamc@88:                                              fun good () = SOME (E.pushCNamedAs env x n2 k2 (SOME c2), denv)
adamc@41:                                          in
adamc@86:                                              (case unifyCons (env, denv) c1 c2 of
adamc@86:                                                   [] => good ()
adamc@86:                                                 | _ => NONE)
adamc@86:                                              handle CUnify (c1, c2, err) =>
adamc@86:                                                     (sgnError env (SgiWrongCon (sgi1All, c1, sgi2All, c2, err));
adamc@86:                                                      good ())
adamc@41:                                          end
adamc@41:                                      else
adamc@41:                                          NONE
adamc@31:                                    | _ => NONE)
adamc@31: 
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@86:                                          (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@88:                                          SOME (env, D.assert env denv (c2, d2))
adamc@88:                                      else
adamc@88:                                          NONE
adamc@88:                                    | _ => NONE)
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@88: fun elabDecl ((d, loc), (env, denv, gs)) =
adamc@76:     case d of
adamc@76:         L.DCon (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@76: 
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@76: 
adamc@88:             ([(L'.DCon (x, n, k', c'), loc)], (env', denv, gs' @ gs))
adamc@76:         end
adamc@76:       | L.DVal (x, co, e) =>
adamc@76:         let
adamc@83:             val (c', ck, gs1) = case co of
adamc@83:                                     NONE => (cunif (loc, ktype), ktype, [])
adamc@83:                                   | SOME c => elabCon (env, denv) c
adamc@76: 
adamc@83:             val (e', et, gs2) = elabExp (env, denv) e
adamc@76:             val (env', n) = E.pushENamed env x c'
adamc@86: 
adamc@86:             val gs3 = checkCon (env, denv) e' et c'
adamc@76:         in
adamc@88:             ([(L'.DVal (x, n, c', e'), loc)], (env', denv, gs1 @ gs2 @ gs3 @ gs))
adamc@76:         end
adamc@76: 
adamc@76:       | L.DSgn (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'.DSgn (x, n, sgn'), loc)], (env', denv, gs' @ gs))
adamc@76:         end
adamc@76: 
adamc@76:       | L.DStr (x, sgno, str) =>
adamc@76:         let
adamc@83:             val formal = Option.map (elabSgn (env, denv)) sgno
adamc@76: 
adamc@83:             val (str', sgn', gs') =
adamc@78:                 case formal of
adamc@78:                     NONE =>
adamc@78:                     let
adamc@83:                         val (str', actual, ds) = elabStr (env, denv) str
adamc@78:                     in
adamc@83:                         (str', selfifyAt env {str = str', sgn = actual}, ds)
adamc@78:                     end
adamc@83:                   | SOME (formal, gs1) =>
adamc@78:                     let
adamc@78:                         val str =
adamc@78:                             case #1 (hnormSgn env formal) of
adamc@78:                                 L'.SgnConst sgis =>
adamc@78:                                 (case #1 str of
adamc@78:                                      L.StrConst ds =>
adamc@78:                                      let
adamc@78:                                          val needed = foldl (fn ((sgi, _), needed) =>
adamc@78:                                                                 case sgi of
adamc@78:                                                                     L'.SgiConAbs (x, _, _) => SS.add (needed, x)
adamc@78:                                                                   | _ => needed)
adamc@78:                                                             SS.empty sgis
adamc@78:                                                       
adamc@78:                                          val needed = foldl (fn ((d, _), needed) =>
adamc@78:                                                                 case d of
adamc@78:                                                                     L.DCon (x, _, _) => (SS.delete (needed, x)
adamc@78:                                                                                          handle NotFound => needed)
adamc@78:                                                                   | L.DOpen _ => SS.empty
adamc@78:                                                                   | _ => needed)
adamc@78:                                                             needed ds
adamc@78:                                      in
adamc@78:                                          case SS.listItems needed of
adamc@78:                                              [] => str
adamc@78:                                            | xs =>
adamc@78:                                              let
adamc@78:                                                  val kwild = (L.KWild, #2 str)
adamc@78:                                                  val cwild = (L.CWild kwild, #2 str)
adamc@78:                                                  val ds' = map (fn x => (L.DCon (x, NONE, cwild), #2 str)) xs
adamc@78:                                              in
adamc@78:                                                  (L.StrConst (ds @ ds'), #2 str)
adamc@78:                                              end
adamc@78:                                      end
adamc@78:                                    | _ => str)
adamc@78:                               | _ => str
adamc@78: 
adamc@83:                         val (str', actual, gs2) = elabStr (env, denv) str
adamc@78:                     in
adamc@86:                         subSgn (env, denv) actual formal;
adamc@83:                         (str', formal, gs1 @ gs2)
adamc@78:                     end
adamc@76: 
adamc@76:             val (env', n) = E.pushStrNamed env x sgn'
adamc@76:         in
adamc@76:             case #1 (hnormSgn env sgn') of
adamc@76:                 L'.SgnFun _ =>
adamc@76:                 (case #1 str' of
adamc@76:                      L'.StrFun _ => ()
adamc@76:                    | _ => strError env (FunctorRebind loc))
adamc@76:               | _ => ();
adamc@76: 
adamc@88:             ([(L'.DStr (x, n, sgn', str'), loc)], (env', denv, gs' @ gs))
adamc@76:         end
adamc@76: 
adamc@76:       | L.DFfiStr (x, sgn) =>
adamc@76:         let
adamc@83:             val (sgn', gs') = elabSgn (env, denv) sgn
adamc@76: 
adamc@76:             val (env', n) = E.pushStrNamed env x sgn'
adamc@76:         in
adamc@88:             ([(L'.DFfiStr (x, n, sgn'), loc)], (env', denv, gs' @ gs))
adamc@76:         end
adamc@76: 
adamc@76:       | L.DOpen (m, ms) =>
adamc@88:         (case E.lookupStr env m of
adamc@88:              NONE => (strError env (UnboundStr (loc, m));
adamc@88:                       ([], (env, denv, [])))
adamc@88:            | SOME (n, sgn) =>
adamc@88:              let
adamc@88:                  val (_, 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) ms
adamc@83: 
adamc@88:                  val (ds, (env', denv')) = dopen (env, denv) {str = n, strs = ms, sgn = sgn}
adamc@88:                  val denv' = dopenConstraints (loc, env', denv') {str = m, strs = ms}
adamc@88:              in
adamc@88:                  (ds, (env', denv', []))
adamc@88:              end)
adamc@88: 
adamc@88:       | L.DConstraint (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:             val gs3 = map (fn cs => (loc, env, denv, cs)) (D.prove env denv (c1', c2', loc))
adamc@88: 
adamc@88:             val denv' = 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@88:             ([(L'.DConstraint (c1', c2'), loc)], (env, denv', gs1 @ gs2 @ gs3))
adamc@88:         end
adamc@88: 
adamc@88:       | L.DOpenConstraints (m, ms) =>
adamc@88:         let
adamc@88:             val denv = dopenConstraints (loc, env, denv) {str = m, strs = ms}
adamc@88:         in
adamc@88:             ([], (env, denv, []))
adamc@88:         end
adamc@3: 
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@59:             val sgis = map 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@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@88:                             | L'.SgiConstraint _ => ((sgi, loc) :: sgis, cons, vals, sgns, strs))
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@83:              gs1 @ gs2 @ gs3)
adamc@41:         end
adamc@44:       | L.StrApp (str1, str2) =>
adamc@44:         let
adamc@83:             val (str1', sgn1, gs1) = elabStr (env, denv) str1
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@56: fun elabFile basis 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@83:                    | _ => raise Fail "Unresolved disjointness constraints in Basis"
adamc@83: 
adamc@56:         val (env', basis_n) = E.pushStrNamed env "Basis" sgn
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@56: 
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@76:                         declError env (KunifsRemain (#2 d))
adamc@76:                     else
adamc@76:                         ();
adamc@76:                     
adamc@76:                     case ListUtil.search cunifsInDecl ds of
adamc@76:                         NONE => ()
adamc@76:                       | SOME loc =>
adamc@76:                         declError env (CunifsRemain loc)
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@84:             app (fn (loc, env, denv, (c1, c2)) =>
adamc@84:                     case D.prove env denv (c1, c2, loc) of
adamc@84:                         [] => ()
adamc@84:                       | _ =>
adamc@86:                         (ErrorMsg.errorAt loc "Couldn't prove field name disjointness";
adamc@84:                          eprefaces' [("Con 1", p_con env c1),
adamc@84:                                      ("Con 2", p_con env c2)])) gs;
adamc@83: 
adamc@56:         (L'.DFfiStr ("Basis", basis_n, sgn), ErrorMsg.dummySpan) :: ds @ file
adamc@56:     end
adamc@2: 
adamc@2: end