adamc@674: (* Copyright (c) 2008-2009, 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 ElabEnv :> ELAB_ENV = struct
adamc@2: 
adamc@2: open Elab
adamc@2: 
adamc@13: structure U = ElabUtil
adamc@13: 
adamc@2: structure IM = IntBinaryMap
adamc@2: structure SM = BinaryMapFn(struct
adamc@2:                            type ord_key = string
adamc@2:                            val compare = String.compare
adamc@2:                            end)
adamc@2: 
adamc@2: exception UnboundRel of int
adamc@2: exception UnboundNamed of int
adamc@2: 
adamc@13: 
adamc@13: (* AST utility functions *)
adamc@13: 
adamc@13: exception SynUnif
adamc@13: 
adamc@623: val liftKindInKind =
adamc@623:     U.Kind.mapB {kind = fn bound => fn k =>
adamc@623:                                        case k of
adamc@623:                                          KRel xn =>
adamc@623:                                          if xn < bound then
adamc@623:                                              k
adamc@623:                                          else
adamc@623:                                              KRel (xn + 1)
adamc@623:                                        | _ => k,
adamc@623:                  bind = fn (bound, _) => bound + 1}
adamc@623: 
adamc@623: val liftKindInCon =
adamc@623:     U.Con.mapB {kind = fn bound => fn k =>
adamc@623:                                       case k of
adamc@623:                                           KRel xn =>
adamc@623:                                           if xn < bound then
adamc@623:                                               k
adamc@623:                                           else
adamc@623:                                               KRel (xn + 1)
adamc@623:                                         | _ => k,
adamc@623:                 con = fn _ => fn c => c,
adamc@623:                 bind = fn (bound, U.Con.RelK _) => bound + 1
adamc@623:                         | (bound, _) => bound}
adamc@623: 
adamc@13: val liftConInCon =
adamc@623:     U.Con.mapB {kind = fn _ => fn k => k,
adamc@13:                 con = fn bound => fn c =>
adamc@13:                                      case c of
adamc@16:                                          CRel xn =>
adamc@13:                                          if xn < bound then
adamc@13:                                              c
adamc@13:                                          else
adamc@16:                                              CRel (xn + 1)
adamc@17:                                        (*| CUnif _ => raise SynUnif*)
adamc@13:                                        | _ => c,
adamc@623:                 bind = fn (bound, U.Con.RelC _) => bound + 1
adamc@13:                         | (bound, _) => bound}
adamc@13: 
adamc@13: val lift = liftConInCon 0
adamc@13: 
adamc@623: val liftKindInExp =
adamc@623:     U.Exp.mapB {kind = fn bound => fn k =>
adamc@623:                                       case k of
adamc@623:                                           KRel xn =>
adamc@623:                                           if xn < bound then
adamc@623:                                               k
adamc@623:                                           else
adamc@623:                                               KRel (xn + 1)
adamc@623:                                         | _ => k,
adamc@623:                 con = fn _ => fn c => c,
adamc@623:                 exp = fn _ => fn e => e,
adamc@623:                 bind = fn (bound, U.Exp.RelK _) => bound + 1
adamc@623:                         | (bound, _) => bound}
adamc@623: 
adamc@448: val liftConInExp =
adamc@623:     U.Exp.mapB {kind = fn _ => fn k => k,
adamc@448:                 con = fn bound => fn c =>
adamc@448:                                      case c of
adamc@448:                                          CRel xn =>
adamc@448:                                          if xn < bound then
adamc@448:                                              c
adamc@448:                                          else
adamc@448:                                              CRel (xn + 1)
adamc@448:                                        | _ => c,
adamc@448:                 exp = fn _ => fn e => e,
adamc@448:                 bind = fn (bound, U.Exp.RelC _) => bound + 1
adamc@448:                         | (bound, _) => bound}
adamc@448: 
adamc@211: val liftExpInExp =
adamc@623:     U.Exp.mapB {kind = fn _ => fn k => k,
adamc@211:                 con = fn _ => fn c => c,
adamc@211:                 exp = fn bound => fn e =>
adamc@211:                                      case e of
adamc@211:                                          ERel xn =>
adamc@211:                                          if xn < bound then
adamc@211:                                              e
adamc@211:                                          else
adamc@211:                                              ERel (xn + 1)
adamc@211:                                        | _ => e,
adamc@211:                 bind = fn (bound, U.Exp.RelE _) => bound + 1
adamc@211:                         | (bound, _) => bound}
adamc@211: 
adamc@211: 
adamc@211: val liftExp = liftExpInExp 0
adamc@13: 
adamc@448: val subExpInExp =
adamc@623:     U.Exp.mapB {kind = fn _ => fn k => k,
adamc@448:                 con = fn _ => fn c => c,
adamc@448:                 exp = fn (xn, rep) => fn e =>
adamc@448:                                   case e of
adamc@448:                                       ERel xn' =>
adamc@448:                                       (case Int.compare (xn', xn) of
adamc@448:                                            EQUAL => #1 rep
adamc@448:                                          | GREATER=> ERel (xn' - 1)
adamc@448:                                          | LESS => e)
adamc@448:                                     | _ => e,
adamc@448:                 bind = fn ((xn, rep), U.Exp.RelE _) => (xn+1, liftExpInExp 0 rep)
adamc@448:                         | ((xn, rep), U.Exp.RelC _) => (xn, liftConInExp 0 rep)
adamc@448:                         | (ctx, _) => ctx}
adamc@448: 
adamc@13: (* Back to environments *)
adamc@13: 
adamc@9: datatype 'a var' =
adamc@9:          Rel' of int * 'a
adamc@9:        | Named' of int * 'a
adamc@2: 
adamc@9: datatype 'a var =
adamc@9:          NotBound
adamc@9:        | Rel of int * 'a
adamc@9:        | Named of int * 'a
adamc@2: 
adamc@191: type datatyp = string list * (string * con option) IM.map
adamc@157: 
adamc@211: datatype class_name =
adamc@211:          ClNamed of int
adamc@211:        | ClProj of int * string list * string
adamc@211: 
adamc@711: fun class_name_out cn =
adamc@711:     case cn of
adamc@711:         ClNamed n => (CNamed n, ErrorMsg.dummySpan)
adamc@711:       | ClProj x => (CModProj x, ErrorMsg.dummySpan)
adamc@711: 
adamc@216: fun cn2s cn =
adamc@216:     case cn of
adamc@216:         ClNamed n => "Named(" ^ Int.toString n ^ ")"
adamc@216:       | ClProj (m, ms, x) => "Proj(" ^ Int.toString m ^ "," ^ String.concatWith "," ms ^ "," ^ x ^ ")"
adamc@216: 
adamc@211: structure CK = struct
adamc@211: type ord_key = class_name
adamc@211: open Order
adamc@211: fun compare x =
adamc@211:     case x of
adamc@211:         (ClNamed n1, ClNamed n2) => Int.compare (n1, n2)
adamc@211:       | (ClNamed _, _) => LESS
adamc@211:       | (_, ClNamed _) => GREATER
adamc@211: 
adamc@211:       | (ClProj (m1, ms1, x1), ClProj (m2, ms2, x2)) =>
adamc@211:         join (Int.compare (m1, m2),
adamc@211:               fn () => join (joinL String.compare (ms1, ms2),
adamc@211:                              fn () => String.compare (x1, x2)))
adamc@211: end
adamc@211: 
adamc@677: structure CS = BinarySetFn(CK)
adamc@211: structure CM = BinaryMapFn(CK)
adamc@211: 
adamc@711: type class = {ground : (con * exp) list,
adamc@711:               rules : (int * con list * con * exp) list}
adamc@711: val empty_class = {ground = [],
adamc@711:                    rules = []}
adamc@216: 
adamc@2: type env = {
adamc@623:      renameK : int SM.map,
adamc@623:      relK : string list,
adamc@623: 
adamc@9:      renameC : kind var' SM.map,
adamc@2:      relC : (string * kind) list,
adamc@11:      namedC : (string * kind * con option) IM.map,
adamc@9: 
adamc@157:      datatypes : datatyp IM.map,
adamc@191:      constructors : (datatype_kind * int * string list * con option * int) SM.map,
adamc@157: 
adamc@211:      classes : class CM.map,
adamc@211: 
adamc@9:      renameE : con var' SM.map,
adamc@9:      relE : (string * con) list,
adamc@31:      namedE : (string * con) IM.map,
adamc@31: 
adamc@31:      renameSgn : (int * sgn) SM.map,
adamc@31:      sgn : (string * sgn) IM.map,
adamc@31: 
adamc@31:      renameStr : (int * sgn) SM.map,
adamc@31:      str : (string * sgn) IM.map
adamc@2: }
adamc@2: 
adamc@2: val namedCounter = ref 0
adamc@2: 
adamc@109: fun newNamed () =
adamc@109:     let
adamc@109:         val r = !namedCounter
adamc@109:     in
adamc@109:         namedCounter := r + 1;
adamc@109:         r
adamc@109:     end
adamc@109: 
adamc@2: val empty = {
adamc@623:     renameK = SM.empty,
adamc@623:     relK = [],
adamc@623: 
adamc@2:     renameC = SM.empty,
adamc@2:     relC = [],
adamc@9:     namedC = IM.empty,
adamc@9: 
adamc@157:     datatypes = IM.empty,
adamc@171:     constructors = SM.empty,
adamc@157: 
adamc@211:     classes = CM.empty,
adamc@211: 
adamc@9:     renameE = SM.empty,
adamc@9:     relE = [],
adamc@31:     namedE = IM.empty,
adamc@31: 
adamc@31:     renameSgn = SM.empty,
adamc@31:     sgn = IM.empty,
adamc@31: 
adamc@31:     renameStr = SM.empty,
adamc@31:     str = IM.empty
adamc@2: }
adamc@2: 
adamc@623: fun pushKRel (env : env) x =
adamc@623:     let
adamc@623:         val renameK = SM.map (fn n => n+1) (#renameK env)
adamc@623:     in
adamc@623:         {renameK = SM.insert (renameK, x, 0),
adamc@623:          relK = x :: #relK env,
adamc@623: 
adamc@623:          renameC = SM.map (fn Rel' (n, k) => Rel' (n, liftKindInKind 0 k)
adamc@623:                             | x => x) (#renameC env),
adamc@623:          relC = map (fn (x, k) => (x, liftKindInKind 0 k)) (#relC env),
adamc@623:          namedC = #namedC env,
adamc@623: 
adamc@623:          datatypes = #datatypes env,
adamc@623:          constructors = #constructors env,
adamc@623: 
adamc@711:          classes = CM.map (fn cl => {ground = map (fn (c, e) =>
adamc@711:                                                       (liftKindInCon 0 c,
adamc@711:                                                        e))
adamc@711:                                                   (#ground cl),
adamc@711:                                      rules = #rules cl})
adamc@711:                           (#classes env),
adamc@623: 
adamc@623:          renameE = SM.map (fn Rel' (n, c) => Rel' (n, liftKindInCon 0 c)
adamc@623:                             | Named' (n, c) => Named' (n, c)) (#renameE env),
adamc@623:          relE = map (fn (x, c) => (x, liftKindInCon 0 c)) (#relE env),
adamc@623:          namedE = #namedE env,
adamc@623: 
adamc@623:          renameSgn = #renameSgn env,
adamc@623:          sgn = #sgn env,
adamc@623: 
adamc@623:          renameStr = #renameStr env,
adamc@623:          str = #str env
adamc@623:         }
adamc@623:     end
adamc@623: 
adamc@623: fun lookupKRel (env : env) n =
adamc@623:     (List.nth (#relK env, n))
adamc@623:     handle Subscript => raise UnboundRel n
adamc@623: 
adamc@623: fun lookupK (env : env) x = SM.find (#renameK env, x)
adamc@623: 
adamc@2: fun pushCRel (env : env) x k =
adamc@2:     let
adamc@9:         val renameC = SM.map (fn Rel' (n, k) => Rel' (n+1, k)
adamc@2:                                | x => x) (#renameC env)
adamc@2:     in
adamc@623:         {renameK = #renameK env,
adamc@623:          relK = #relK env,
adamc@623: 
adamc@623:          renameC = SM.insert (renameC, x, Rel' (0, k)),
adamc@2:          relC = (x, k) :: #relC env,
adamc@514:          namedC = #namedC env,
adamc@9: 
adamc@157:          datatypes = #datatypes env,
adamc@171:          constructors = #constructors env,
adamc@157: 
adamc@674:          classes = CM.map (fn class =>
adamc@711:                               {ground = map (fn (c, e) =>
adamc@711:                                                 (liftConInCon 0 c,
adamc@711:                                                  e))
adamc@711:                                             (#ground class),
adamc@711:                                rules = #rules class})
adamc@211:                           (#classes env),
adamc@211: 
adamc@328:          renameE = SM.map (fn Rel' (n, c) => Rel' (n, lift c)
adamc@517:                             | Named' (n, c) => Named' (n, c)) (#renameE env),
adamc@13:          relE = map (fn (x, c) => (x, lift c)) (#relE env),
adamc@514:          namedE = #namedE env,
adamc@31: 
adamc@31:          renameSgn = #renameSgn env,
adamc@31:          sgn = #sgn env,
adamc@31: 
adamc@31:          renameStr = #renameStr env,
adamc@31:          str = #str env
adamc@31:         }
adamc@2:     end
adamc@2: 
adamc@2: fun lookupCRel (env : env) n =
adamc@2:     (List.nth (#relC env, n))
adamc@2:     handle Subscript => raise UnboundRel n
adamc@2: 
adamc@11: fun pushCNamedAs (env : env) x n k co =
adamc@623:     {renameK = #renameK env,
adamc@623:      relK = #relK env,
adamc@623: 
adamc@623:      renameC = SM.insert (#renameC env, x, Named' (n, k)),
adamc@5:      relC = #relC env,
adamc@11:      namedC = IM.insert (#namedC env, n, (x, k, co)),
adamc@9: 
adamc@157:      datatypes = #datatypes env,
adamc@171:      constructors = #constructors env,
adamc@157: 
adamc@211:      classes = #classes env,
adamc@211: 
adamc@9:      renameE = #renameE env,
adamc@9:      relE = #relE env,
adamc@31:      namedE = #namedE env,
adamc@31: 
adamc@31:      renameSgn = #renameSgn env,
adamc@31:      sgn = #sgn env,
adamc@31:      
adamc@31:      renameStr = #renameStr env,
adamc@31:      str = #str env}
adamc@5: 
adamc@11: fun pushCNamed env x k co =
adamc@2:     let
adamc@2:         val n = !namedCounter
adamc@2:     in
adamc@2:         namedCounter := n + 1;
adamc@11:         (pushCNamedAs env x n k co, n)
adamc@2:     end
adamc@2: 
adamc@2: fun lookupCNamed (env : env) n =
adamc@2:     case IM.find (#namedC env, n) of
adamc@2:         NONE => raise UnboundNamed n
adamc@2:       | SOME x => x
adamc@2: 
adamc@2: fun lookupC (env : env) x =
adamc@2:     case SM.find (#renameC env, x) of
adamc@9:         NONE => NotBound
adamc@9:       | SOME (Rel' x) => Rel x
adamc@9:       | SOME (Named' x) => Named x
adamc@9: 
adamc@191: fun pushDatatype (env : env) n xs xncs =
adamc@188:     let
adamc@188:         val dk = U.classifyDatatype xncs
adamc@188:     in
adamc@623:         {renameK = #renameK env,
adamc@623:          relK = #relK env,
adamc@623: 
adamc@623:          renameC = #renameC env,
adamc@188:          relC = #relC env,
adamc@188:          namedC = #namedC env,
adamc@157: 
adamc@188:          datatypes = IM.insert (#datatypes env, n,
adamc@191:                                 (xs, foldl (fn ((x, n, to), cons) =>
adamc@191:                                                IM.insert (cons, n, (x, to))) IM.empty xncs)),
adamc@188:          constructors = foldl (fn ((x, n', to), cmap) =>
adamc@191:                                   SM.insert (cmap, x, (dk, n', xs, to, n)))
adamc@188:                               (#constructors env) xncs,
adamc@157: 
adamc@211:          classes = #classes env,
adamc@211: 
adamc@188:          renameE = #renameE env,
adamc@188:          relE = #relE env,
adamc@188:          namedE = #namedE env,
adamc@157: 
adamc@188:          renameSgn = #renameSgn env,
adamc@188:          sgn = #sgn env,
adamc@157: 
adamc@188:          renameStr = #renameStr env,
adamc@188:          str = #str env}
adamc@188:     end
adamc@157: 
adamc@157: fun lookupDatatype (env : env) n =
adamc@157:     case IM.find (#datatypes env, n) of
adamc@157:         NONE => raise UnboundNamed n
adamc@157:       | SOME x => x
adamc@157: 
adamc@191: fun lookupDatatypeConstructor (_, dt) n =
adamc@157:     case IM.find (dt, n) of
adamc@157:         NONE => raise UnboundNamed n
adamc@157:       | SOME x => x
adamc@157: 
adamc@171: fun lookupConstructor (env : env) s = SM.find (#constructors env, s)
adamc@171: 
adamc@191: fun datatypeArgs (xs, _) = xs
adamc@191: fun constructors (_, dt) = IM.foldri (fn (n, (x, to), ls) => (x, n, to) :: ls) [] dt
adamc@157: 
adamc@711: fun listClasses (env : env) =
adamc@711:     map (fn (cn, {ground, rules}) =>
adamc@711:             (class_name_out cn,
adamc@711:              ground
adamc@711:              @ map (fn (nvs, cs, c, e) =>
adamc@711:                        let
adamc@711:                            val loc = #2 c
adamc@711:                            val c = foldr (fn (c', c) => (TFun (c', c), loc)) c cs
adamc@711:                            val c = ListUtil.foldli (fn (n, (), c) => (TCFun (Explicit,
adamc@711:                                                                              "x" ^ Int.toString n,
adamc@711:                                                                              (KError, loc),
adamc@711:                                                                              c), loc))
adamc@711:                                                    c (List.tabulate (nvs, fn _ => ()))
adamc@711:                        in
adamc@711:                            (c, e)
adamc@711:                        end) rules)) (CM.listItemsi (#classes env))
adamc@711: 
adamc@211: fun pushClass (env : env) n =
adamc@623:     {renameK = #renameK env,
adamc@623:      relK = #relK env,
adamc@623: 
adamc@623:      renameC = #renameC env,
adamc@211:      relC = #relC env,
adamc@211:      namedC = #namedC env,
adamc@211: 
adamc@211:      datatypes = #datatypes env,
adamc@211:      constructors = #constructors env,
adamc@211: 
adamc@675:      classes = CM.insert (#classes env, ClNamed n, empty_class),
adamc@211: 
adamc@211:      renameE = #renameE env,
adamc@211:      relE = #relE env,
adamc@211:      namedE = #namedE env,
adamc@211: 
adamc@211:      renameSgn = #renameSgn env,
adamc@211:      sgn = #sgn env,
adamc@211: 
adamc@211:      renameStr = #renameStr env,
adamc@403:      str = #str env}
adamc@211: 
adamc@211: fun class_name_in (c, _) =
adamc@211:     case c of
adamc@211:         CNamed n => SOME (ClNamed n)
adamc@211:       | CModProj x => SOME (ClProj x)
adamc@228:       | CUnif (_, _, _, ref (SOME c)) => class_name_in c
adamc@211:       | _ => NONE
adamc@211: 
adamc@403: fun isClass (env : env) c =
adamc@403:     let
adamc@403:         fun find NONE = false
adamc@403:           | find (SOME c) = Option.isSome (CM.find (#classes env, c))
adamc@403:     in
adamc@403:         find (class_name_in c)
adamc@403:     end
adamc@403: 
adamc@711: fun class_head_in c =
adamc@711:     case #1 c of
adamc@711:         CApp (f, _) => class_head_in f
adamc@711:       | CUnif (_, _, _, ref (SOME c)) => class_head_in c
adamc@711:       | _ => class_name_in c
adamc@211: 
adamc@711: exception Unify
adamc@711: 
adamc@711: fun unifyKinds (k1, k2) =
adamc@711:     case (#1 k1, #1 k2) of
adamc@711:         (KType, KType) => ()
adamc@711:       | (KArrow (d1, r1), KArrow (d2, r2)) => (unifyKinds (d1, d2); unifyKinds (r1, r2))
adamc@711:       | (KName, KName) => ()
adamc@711:       | (KRecord k1, KRecord k2) => unifyKinds (k1, k2)
adamc@711:       | (KUnit, KUnit) => ()
adamc@711:       | (KTuple ks1, KTuple ks2) => (ListPair.appEq unifyKinds (ks1, ks2)
adamc@711:                                      handle ListPair.UnequalLengths => raise Unify)
adamc@711:       | (KUnif (_, _, ref (SOME k1)), _) => unifyKinds (k1, k2)
adamc@711:       | (_, KUnif (_, _, ref (SOME k2))) => unifyKinds (k1, k2)
adamc@711:       | (KRel n1, KRel n2) => if n1 = n2 then () else raise Unify
adamc@711:       | (KFun (_, k1), KFun (_, k2)) => unifyKinds (k1, k2)
adamc@711:       | _ => raise Unify
adamc@711: 
adamc@711: fun unifyCons rs =
adamc@674:     let
adamc@711:         fun unify d (c1, c2) =
adamc@711:             case (#1 c1, #1 c2) of
adamc@711:                 (CUnif (_, _, _, ref (SOME c1)), _) => unify d (c1, c2)
adamc@711:               | (_, CUnif (_, _, _, ref (SOME c2))) => unify d (c1, c2)
adamc@711: 
adamc@750:               | (CUnif _, _) => ()
adamc@750: 
adamc@711:               | (c1', CRel n2) =>
adamc@711:                 if n2 < d then
adamc@711:                     case c1' of
adamc@711:                         CRel n1 => if n1 = n2 then () else raise Unify
adamc@711:                       | _ => raise Unify
adamc@711:                 else if n2 - d >= length rs then
adamc@711:                     case c1' of
adamc@711:                         CRel n1 => if n1 = n2 - length rs then () else raise Unify
adamc@711:                       | _ => raise Unify
adamc@711:                 else
adamc@711:                     let
adamc@711:                         val r = List.nth (rs, n2 - d)
adamc@711:                     in
adamc@711:                         case !r of
adamc@711:                             NONE => r := SOME c1
adamc@711:                           | SOME c2 => unify d (c1, c2)
adamc@711:                     end
adamc@711: 
adamc@711:               | (TFun (d1, r1), TFun (d2, r2)) => (unify d (d1, d2); unify d (r1, r2))
adamc@711:               | (TCFun (_, _, k1, r1), TCFun (_, _, k2, r2)) => (unifyKinds (k1, k2); unify (d + 1) (r1, r2))
adamc@711:               | (TRecord c1, TRecord c2) => unify d (c1, c2)
adamc@711:               | (TDisjoint (a1, b1, c1), TDisjoint (a2, b2, c2)) =>
adamc@711:                 (unify d (a1, a2); unify d (b1, b2); unify d (c1, c2))
adamc@711: 
adamc@711:               | (CNamed n1, CNamed n2) => if n1 = n2 then () else raise Unify
adamc@711:               | (CModProj (n1, ms1, x1), CModProj (n2, ms2, x2)) =>
adamc@711:                 if n1 = n2 andalso ms1 = ms2 andalso x1 = x2 then () else raise Unify
adamc@711:               | (CApp (f1, x1), CApp (f2, x2)) => (unify d (f1, f2); unify d (x1, x2))
adamc@711:               | (CAbs (_, k1, b1), CAbs (_, k2, b2)) => (unifyKinds (k1, k2); unify (d + 1) (b1, b2))
adamc@711: 
adamc@711:               | (CKAbs (_, b1), CKAbs (_, b2)) => unify d (b1, b2)
adamc@711:               | (CKApp (c1, k1), CKApp (c2, k2)) => (unify d (c1, c2); unifyKinds (k1, k2))
adamc@711:               | (TKFun (_, c1), TKFun (_, c2)) => unify d (c1, c2)
adamc@711: 
adamc@711:               | (CName s1, CName s2) => if s1 = s2 then () else raise Unify
adamc@711: 
adamc@711:               | (CRecord (k1, xcs1), CRecord (k2, xcs2)) =>
adamc@711:                 (unifyKinds (k1, k2);
adamc@711:                  ListPair.appEq (fn ((x1, c1), (x2, c2)) => (unify d (x1, x2); unify d (c1, c2))) (xcs1, xcs2)
adamc@711:                  handle ListPair.UnequalLengths => raise Unify)
adamc@711:               | (CConcat (f1, x1), CConcat (f2, x2)) => (unify d (f1, f2); unify d (x1, x2))
adamc@711:               | (CMap (d1, r1), CMap (d2, r2)) => (unifyKinds (d1, d2); unifyKinds (r1, r2))
adamc@711: 
adamc@711:               | (CUnit, CUnit) => ()
adamc@711: 
adamc@711:               | (CTuple cs1, CTuple cs2) => (ListPair.appEq (unify d) (cs1, cs2)
adamc@711:                                              handle ListPair.UnequalLengths => raise Unify)
adamc@711:               | (CProj (c1, n1), CProj (c2, n2)) => (unify d (c1, c2);
adamc@711:                                                      if n1 = n2 then () else raise Unify)
adamc@711: 
adamc@711:               | _ => raise Unify
adamc@674:     in
adamc@711:         unify
adamc@674:     end
adamc@674: 
adamc@711: fun tryUnify nRs (c1, c2) =
adamc@674:     let
adamc@711:         val rs = List.tabulate (nRs, fn _ => ref NONE)
adamc@674:     in
adamc@711:         (unifyCons rs 0 (c1, c2);
adamc@711:          SOME (map (fn r => case !r of
adamc@711:                                 NONE => raise Unify
adamc@711:                               | SOME c => c) rs))
adamc@711:         handle Unify => NONE
adamc@674:     end
adamc@674: 
adamc@711: fun unifySubst (rs : con list) =
adamc@711:     U.Con.mapB {kind = fn _ => fn k => k,
adamc@711:                 con = fn d => fn c =>
adamc@711:                                  case c of
adamc@711:                                      CRel n =>
adamc@711:                                      if n < d then
adamc@711:                                          c
adamc@711:                                      else
adamc@711:                                          #1 (List.nth (rs, n - d))
adamc@711:                                    | _ => c,
adamc@711:                 bind = fn (d, U.Con.RelC _) => d + 1
adamc@711:                         | (d, _) => d}
adamc@711:                0
adamc@711: 
adamc@753: exception Bad of con * con
adamc@750: 
adamc@754: val hasUnif = U.Con.exists {kind = fn _ => false,
adamc@754:                             con = fn CUnif (_, _, _, ref NONE) => true
adamc@754:                                    | _ => false}
adamc@754: 
adamc@754: fun startsWithUnif c =
adamc@754:     let
adamc@754:         fun firstArg (c, acc) =
adamc@754:             case #1 c of
adamc@754:                 CApp (f, x) => firstArg (f, SOME x)
adamc@754:               | _ => acc
adamc@754:     in
adamc@754:         case firstArg (c, NONE) of
adamc@754:             NONE => false
adamc@754:           | SOME x => hasUnif x
adamc@754:     end
adamc@754: 
adamc@753: fun resolveClass (hnorm : con -> con) (consEq : con * con -> bool) (env : env) =
adamc@674:     let
adamc@711:         fun resolve c =
adamc@711:             let
adamc@711:                 fun doHead f =
adamc@711:                     case CM.find (#classes env, f) of
adamc@711:                         NONE => NONE
adamc@711:                       | SOME class =>
adamc@711:                         let
adamc@711:                             val loc = #2 c
adamc@675: 
adamc@753:                             fun generalize (c as (_, loc)) =
adamc@753:                                 case #1 c of
adamc@753:                                     CApp (f, x) =>
adamc@753:                                     let
adamc@753:                                         val (f, equate) = generalize f
adamc@753: 
adamc@753:                                         fun isRecord () =
adamc@753:                                             let
adamc@753:                                                 val rk = ref NONE
adamc@753:                                                 val k = (KUnif (loc, "k", rk), loc)
adamc@753:                                                 val r = ref NONE
adamc@753:                                                 val rc = (CUnif (loc, k, "x", r), loc)
adamc@753:                                             in
adamc@753:                                                 ((CApp (f, rc), loc),
adamc@753:                                               fn () => (if consEq (rc, x) then
adamc@753:                                                             true
adamc@753:                                                         else
adamc@753:                                                             (raise Bad (rc, x);
adamc@753:                                                              false))
adamc@753:                                                        andalso equate ())
adamc@753:                                             end
adamc@753:                                     in
adamc@753:                                         case #1 x of
adamc@753:                                             CConcat _ => isRecord ()
adamc@753:                                           | CRecord _ => isRecord ()
adamc@753:                                           | _ => ((CApp (f, x), loc), equate)
adamc@753:                                     end
adamc@753:                                   | _ => (c, fn () => true)
adamc@753: 
adamc@753:                             val (c, equate) = generalize c
adamc@753: 
adamc@711:                             fun tryRules rules =
adamc@711:                                 case rules of
adamc@675:                                     [] => NONE
adamc@711:                                   | (nRs, cs, c', e) :: rules' =>
adamc@711:                                     case tryUnify nRs (c, c') of
adamc@711:                                         NONE => tryRules rules'
adamc@711:                                       | SOME rs =>
adamc@675:                                         let
adamc@711:                                             val eos = map (resolve o unifySubst rs) cs
adamc@675:                                         in
adamc@750:                                             if List.exists (not o Option.isSome) eos
adamc@753:                                                orelse not (equate ())
adamc@753:                                                orelse not (consEq (c, unifySubst rs c')) then
adamc@711:                                                 tryRules rules'
adamc@711:                                             else
adamc@711:                                                 let
adamc@711:                                                     val es = List.mapPartial (fn x => x) eos
adamc@711: 
adamc@711:                                                     val e = foldr (fn (c, e) => (ECApp (e, c), loc)) e rs
adamc@711:                                                     val e = foldl (fn (e', e) => (EApp (e, e'), loc)) e es
adamc@711:                                                 in
adamc@711:                                                     SOME e
adamc@711:                                                 end
adamc@675:                                         end
adamc@711: 
adamc@711:                             fun rules () = tryRules (#rules class)
adamc@711:   
adamc@711:                             fun tryGrounds ces =
adamc@711:                                 case ces of
adamc@711:                                     [] => rules ()
adamc@711:                                   | (c', e) :: ces' =>
adamc@711:                                     case tryUnify 0 (c, c') of
adamc@711:                                         NONE => tryGrounds ces'
adamc@711:                                       | SOME _ => SOME e
adamc@675:                         in
adamc@711:                             tryGrounds (#ground class)
adamc@675:                         end
adamc@711:             in
adamc@754:                 if startsWithUnif c then
adamc@754:                     NONE
adamc@754:                 else
adamc@754:                     case #1 c of
adamc@754:                         TRecord c =>
adamc@754:                         (case #1 (hnorm c) of
adamc@754:                              CRecord (_, xts) =>
adamc@754:                              let
adamc@754:                                  fun resolver (xts, acc) =
adamc@754:                                      case xts of
adamc@754:                                          [] => SOME (ERecord acc, #2 c)
adamc@754:                                        | (x, t) :: xts =>
adamc@754:                                          let
adamc@754:                                              val t = hnorm t
adamc@750: 
adamc@754:                                              val t = case t of
adamc@754:                                                          (CApp (f, x), loc) => (CApp (hnorm f, hnorm x), loc)
adamc@754:                                                        | _ => t
adamc@754:                                          in
adamc@754:                                              case resolve t of
adamc@754:                                                  NONE => NONE
adamc@754:                                                | SOME e => resolver (xts, (x, e, t) :: acc)
adamc@754:                                          end
adamc@754:                              in
adamc@754:                                  resolver (xts, [])
adamc@754:                              end
adamc@754:                            | _ => NONE)
adamc@754:                       | _ =>
adamc@754:                         case class_head_in c of
adamc@754:                             SOME f => doHead f
adamc@754:                           | _ => NONE
adamc@711:             end
adamc@674:     in
adamc@711:         resolve
adamc@674:     end
adamc@211: 
adamc@9: fun pushERel (env : env) x t =
adamc@9:     let
adamc@9:         val renameE = SM.map (fn Rel' (n, t) => Rel' (n+1, t)
adamc@9:                                | x => x) (#renameE env)
adamc@211: 
adamc@675:         val classes = CM.map (fn class =>
adamc@711:                                  {ground = map (fn (c, e) => (c, liftExp e)) (#ground class),
adamc@711:                                   rules = #rules class}) (#classes env)
adamc@711:         val classes = case class_head_in t of
adamc@211:                           NONE => classes
adamc@711:                         | SOME f =>
adamc@403:                           case CM.find (classes, f) of
adamc@403:                               NONE => classes
adamc@403:                             | SOME class =>
adamc@403:                               let
adamc@711:                                   val class = {ground = (t, (ERel 0, #2 t)) :: #ground class,
adamc@711:                                                rules = #rules class}
adamc@403:                               in
adamc@403:                                   CM.insert (classes, f, class)
adamc@403:                               end
adamc@9:     in
adamc@623:         {renameK = #renameK env,
adamc@623:          relK = #relK env,
adamc@623: 
adamc@623:          renameC = #renameC env,
adamc@9:          relC = #relC env,
adamc@9:          namedC = #namedC env,
adamc@9: 
adamc@157:          datatypes = #datatypes env,
adamc@171:          constructors = #constructors env,
adamc@157: 
adamc@211:          classes = classes,
adamc@211: 
adamc@9:          renameE = SM.insert (renameE, x, Rel' (0, t)),
adamc@9:          relE = (x, t) :: #relE env,
adamc@31:          namedE = #namedE env,
adamc@31: 
adamc@31:          renameSgn = #renameSgn env,
adamc@31:          sgn = #sgn env,
adamc@31: 
adamc@31:          renameStr = #renameStr env,
adamc@31:          str = #str env}
adamc@9:     end
adamc@9: 
adamc@9: fun lookupERel (env : env) n =
adamc@9:     (List.nth (#relE env, n))
adamc@9:     handle Subscript => raise UnboundRel n
adamc@9: 
adamc@674: fun rule_in c =
adamc@674:     let
adamc@674:         fun quantifiers (c, nvars) =
adamc@674:             case #1 c of
adamc@674:                 TCFun (_, _, _, c) => quantifiers (c, nvars + 1)
adamc@674:               | _ =>
adamc@674:                 let
adamc@674:                     fun clauses (c, hyps) =
adamc@674:                         case #1 c of
adamc@674:                             TFun (hyp, c) =>
adamc@711:                             (case class_head_in hyp of
adamc@711:                                  SOME _ => clauses (c, hyp :: hyps)
adamc@711:                                | NONE => NONE)
adamc@674:                           | _ =>
adamc@711:                             case class_head_in c of
adamc@674:                                 NONE => NONE
adamc@711:                               | SOME f => SOME (f, nvars, rev hyps, c)
adamc@674:                 in
adamc@674:                     clauses (c, [])
adamc@674:                 end
adamc@674:     in
adamc@711:         quantifiers (c, 0)
adamc@677:     end
adamc@677: 
adamc@9: fun pushENamedAs (env : env) x n t =
adamc@211:     let
adamc@211:         val classes = #classes env
adamc@674:         val classes = case rule_in t of
adamc@211:                           NONE => classes
adamc@711:                         | SOME (f, nvs, cs, c) =>
adamc@403:                           case CM.find (classes, f) of
adamc@403:                               NONE => classes
adamc@403:                             | SOME class =>
adamc@403:                               let
adamc@675:                                   val e = (ENamed n, #2 t)
adamc@675: 
adamc@675:                                   val class =
adamc@711:                                       {ground = #ground class,
adamc@711:                                        rules = (nvs, cs, c, e) :: #rules class}
adamc@403:                               in
adamc@403:                                   CM.insert (classes, f, class)
adamc@403:                               end
adamc@211:     in
adamc@623:         {renameK = #renameK env,
adamc@623:          relK = #relK env,
adamc@623: 
adamc@623:          renameC = #renameC env,
adamc@211:          relC = #relC env,
adamc@211:          namedC = #namedC env,
adamc@9: 
adamc@211:          datatypes = #datatypes env,
adamc@211:          constructors = #constructors env,
adamc@157: 
adamc@211:          classes = classes,
adamc@31: 
adamc@211:          renameE = SM.insert (#renameE env, x, Named' (n, t)),
adamc@211:          relE = #relE env,
adamc@211:          namedE = IM.insert (#namedE env, n, (x, t)),
adamc@211: 
adamc@211:          renameSgn = #renameSgn env,
adamc@211:          sgn = #sgn env,
adamc@211:          
adamc@211:          renameStr = #renameStr env,
adamc@211:          str = #str env}
adamc@211:     end
adamc@9: 
adamc@9: fun pushENamed env x t =
adamc@9:     let
adamc@9:         val n = !namedCounter
adamc@9:     in
adamc@9:         namedCounter := n + 1;
adamc@9:         (pushENamedAs env x n t, n)
adamc@9:     end
adamc@9: 
adamc@9: fun lookupENamed (env : env) n =
adamc@9:     case IM.find (#namedE env, n) of
adamc@9:         NONE => raise UnboundNamed n
adamc@9:       | SOME x => x
adamc@9: 
adamc@471: fun checkENamed (env : env) n =
adamc@471:     Option.isSome (IM.find (#namedE env, n))
adamc@471: 
adamc@9: fun lookupE (env : env) x =
adamc@9:     case SM.find (#renameE env, x) of
adamc@9:         NONE => NotBound
adamc@9:       | SOME (Rel' x) => Rel x
adamc@9:       | SOME (Named' x) => Named x
adamc@2: 
adamc@31: fun pushSgnNamedAs (env : env) x n sgis =
adamc@623:     {renameK = #renameK env,
adamc@623:      relK = #relK env,
adamc@623: 
adamc@623:      renameC = #renameC env,
adamc@31:      relC = #relC env,
adamc@31:      namedC = #namedC env,
adamc@31: 
adamc@157:      datatypes = #datatypes env,
adamc@171:      constructors = #constructors env,
adamc@157: 
adamc@211:      classes = #classes env,
adamc@211: 
adamc@31:      renameE = #renameE env,
adamc@31:      relE = #relE env,
adamc@31:      namedE = #namedE env,
adamc@31: 
adamc@31:      renameSgn = SM.insert (#renameSgn env, x, (n, sgis)),
adamc@31:      sgn = IM.insert (#sgn env, n, (x, sgis)),
adamc@31:      
adamc@31:      renameStr = #renameStr env,
adamc@31:      str = #str env}
adamc@31: 
adamc@31: fun pushSgnNamed env x sgis =
adamc@31:     let
adamc@31:         val n = !namedCounter
adamc@31:     in
adamc@31:         namedCounter := n + 1;
adamc@31:         (pushSgnNamedAs env x n sgis, n)
adamc@31:     end
adamc@31: 
adamc@31: fun lookupSgnNamed (env : env) n =
adamc@31:     case IM.find (#sgn env, n) of
adamc@31:         NONE => raise UnboundNamed n
adamc@31:       | SOME x => x
adamc@31: 
adamc@31: fun lookupSgn (env : env) x = SM.find (#renameSgn env, x)
adamc@31: 
adamc@31: fun lookupStrNamed (env : env) n =
adamc@31:     case IM.find (#str env, n) of
adamc@31:         NONE => raise UnboundNamed n
adamc@31:       | SOME x => x
adamc@31: 
adamc@31: fun lookupStr (env : env) x = SM.find (#renameStr env, x)
adamc@31: 
adamc@203: 
adamc@216: fun sgiSeek (sgi, (sgns, strs, cons)) =
adamc@216:     case sgi of
adamc@216:         SgiConAbs (x, n, _) => (sgns, strs, IM.insert (cons, n, x))
adamc@216:       | SgiCon (x, n, _, _) => (sgns, strs, IM.insert (cons, n, x))
adamc@216:       | SgiDatatype (x, n, _, _) => (sgns, strs, IM.insert (cons, n, x))
adamc@216:       | SgiDatatypeImp (x, n, _, _, _, _, _) => (sgns, strs, IM.insert (cons, n, x))
adamc@216:       | SgiVal _ => (sgns, strs, cons)
adamc@216:       | SgiSgn (x, n, _) => (IM.insert (sgns, n, x), strs, cons)
adamc@216:       | SgiStr (x, n, _) => (sgns, IM.insert (strs, n, x), cons)
adamc@216:       | SgiConstraint _ => (sgns, strs, cons)
adamc@563:       | SgiClassAbs (x, n, _) => (sgns, strs, IM.insert (cons, n, x))
adamc@563:       | SgiClass (x, n, _, _) => (sgns, strs, IM.insert (cons, n, x))
adamc@216: 
adamc@34: fun sgnSeek f sgis =
adamc@34:     let
adamc@59:         fun seek (sgis, sgns, strs, cons) =
adamc@34:             case sgis of
adamc@34:                 [] => NONE
adamc@34:               | (sgi, _) :: sgis =>
adamc@34:                 case f sgi of
adamc@158:                     SOME v =>
adamc@158:                     let
adamc@158:                         val cons =
adamc@158:                             case sgi of
adamc@191:                                 SgiDatatype (x, n, _, _) => IM.insert (cons, n, x)
adamc@191:                               | SgiDatatypeImp (x, n, _, _, _, _, _) => IM.insert (cons, n, x)
adamc@158:                               | _ => cons
adamc@158:                     in
adamc@158:                         SOME (v, (sgns, strs, cons))
adamc@158:                     end
adamc@88:                   | NONE =>
adamc@216:                     let
adamc@216:                         val (sgns, strs, cons) = sgiSeek (sgi, (sgns, strs, cons))
adamc@216:                     in
adamc@216:                         seek (sgis, sgns, strs, cons)
adamc@216:                     end
adamc@34:     in
adamc@59:         seek (sgis, IM.empty, IM.empty, IM.empty)
adamc@34:     end
adamc@34: 
adamc@34: fun id x = x
adamc@34: 
adamc@34: fun unravelStr (str, _) =
adamc@34:     case str of
adamc@34:         StrVar x => (x, [])
adamc@34:       | StrProj (str, m) =>
adamc@34:         let
adamc@34:             val (x, ms) = unravelStr str
adamc@34:         in
adamc@34:             (x, ms @ [m])
adamc@34:         end
adamc@34:       | _ => raise Fail "unravelStr"
adamc@34: 
adamc@59: fun sgnS_con (str, (sgns, strs, cons)) c =
adamc@34:     case c of
adamc@34:         CModProj (m1, ms, x) =>
adamc@34:         (case IM.find (strs, m1) of
adamc@34:              NONE => c
adamc@34:            | SOME m1x =>
adamc@34:              let
adamc@34:                  val (m1, ms') = unravelStr str
adamc@34:              in
adamc@34:                  CModProj (m1, ms' @ m1x :: ms, x)
adamc@34:              end)
adamc@34:       | CNamed n =>
adamc@34:         (case IM.find (cons, n) of
adamc@34:              NONE => c
adamc@34:            | SOME nx =>
adamc@34:              let
adamc@34:                  val (m1, ms) = unravelStr str
adamc@34:              in
adamc@34:                  CModProj (m1, ms, nx)
adamc@34:              end)
adamc@34:       | _ => c
adamc@34: 
adamc@721: fun sgnS_con' (m1, ms', (sgns, strs, cons)) =
adamc@721:     U.Con.map {kind = fn x => x,
adamc@721:                con = fn c =>
adamc@721:                         case c of
adamc@721:                             CModProj (m1, ms, x) =>
adamc@721:                             (case IM.find (strs, m1) of
adamc@721:                                  NONE => c
adamc@721:                                | SOME m1x => CModProj (m1, ms' @ m1x :: ms, x))
adamc@721:                           | CNamed n =>
adamc@721:                             (case IM.find (cons, n) of
adamc@721:                                  NONE => c
adamc@721:                                | SOME nx => CModProj (m1, ms', nx))
adamc@721:                           | _ => c}
adamc@216: 
adamc@59: fun sgnS_sgn (str, (sgns, strs, cons)) sgn =
adamc@59:     case sgn of
adamc@59:         SgnProj (m1, ms, x) =>
adamc@59:         (case IM.find (strs, m1) of
adamc@59:              NONE => sgn
adamc@59:            | SOME m1x =>
adamc@59:              let
adamc@59:                  val (m1, ms') = unravelStr str
adamc@59:              in
adamc@59:                  SgnProj (m1, ms' @ m1x :: ms, x)
adamc@59:              end)
adamc@59:       | SgnVar n =>
adamc@59:         (case IM.find (sgns, n) of
adamc@59:              NONE => sgn
adamc@59:            | SOME nx =>
adamc@59:              let
adamc@59:                  val (m1, ms) = unravelStr str
adamc@59:              in
adamc@59:                  SgnProj (m1, ms, nx)
adamc@59:              end)
adamc@59:       | _ => sgn
adamc@59: 
adamc@59: fun sgnSubSgn x =
adamc@34:     ElabUtil.Sgn.map {kind = id,
adamc@59:                       con = sgnS_con x,
adamc@34:                       sgn_item = id,
adamc@59:                       sgn = sgnS_sgn x}
adamc@34: 
adamc@211: 
adamc@211: 
adamc@211: and projectSgn env {sgn, str, field} =
adamc@211:     case #1 (hnormSgn env sgn) of
adamc@211:         SgnConst sgis =>
adamc@211:         (case sgnSeek (fn SgiSgn (x, _, sgn) => if x = field then SOME sgn else NONE | _ => NONE) sgis of
adamc@211:              NONE => NONE
adamc@211:            | SOME (sgn, subs) => SOME (sgnSubSgn (str, subs) sgn))
adamc@211:       | SgnError => SOME (SgnError, ErrorMsg.dummySpan)
adamc@211:       | _ => NONE
adamc@211: 
adamc@211: and hnormSgn env (all as (sgn, loc)) =
adamc@34:     case sgn of
adamc@42:         SgnError => all
adamc@42:       | SgnVar n => hnormSgn env (#2 (lookupSgnNamed env n))
adamc@42:       | SgnConst _ => all
adamc@42:       | SgnFun _ => all
adamc@59:       | SgnProj (m, ms, x) =>
adamc@59:         let
adamc@59:             val (_, sgn) = lookupStrNamed env m
adamc@59:         in
adamc@59:             case projectSgn env {str = foldl (fn (m, str) => (StrProj (str, m), loc)) (StrVar m, loc) ms,
adamc@59:                                  sgn = sgn,
adamc@59:                                  field = x} of
adamc@59:                 NONE => raise Fail "ElabEnv.hnormSgn: projectSgn failed"
adamc@59:               | SOME sgn => sgn
adamc@59:         end
adamc@42:       | SgnWhere (sgn, x, c) =>
adamc@42:         case #1 (hnormSgn env sgn) of
adamc@42:             SgnError => (SgnError, loc)
adamc@42:           | SgnConst sgis =>
adamc@42:             let
adamc@42:                 fun traverse (pre, post) =
adamc@42:                     case post of
adamc@42:                         [] => raise Fail "ElabEnv.hnormSgn: Can't reduce 'where' [1]"
adamc@42:                       | (sgi as (SgiConAbs (x', n, k), loc)) :: rest =>
adamc@42:                         if x = x' then
adamc@42:                             List.revAppend (pre, (SgiCon (x', n, k, c), loc) :: rest)
adamc@42:                         else
adamc@42:                             traverse (sgi :: pre, rest)
adamc@42:                       | sgi :: rest => traverse (sgi :: pre, rest)
adamc@42: 
adamc@42:                 val sgis = traverse ([], sgis)
adamc@42:             in
adamc@42:                 (SgnConst sgis, loc)
adamc@42:             end
adamc@42:           | _ => raise Fail "ElabEnv.hnormSgn: Can't reduce 'where' [2]"
adamc@42: 
adamc@211: fun enrichClasses env classes (m1, ms) sgn =
adamc@59:     case #1 (hnormSgn env sgn) of
adamc@59:         SgnConst sgis =>
adamc@211:         let
adamc@218:             val (classes, _, _, _) =
adamc@218:                 foldl (fn (sgi, (classes, newClasses, fmap, env)) =>
adamc@211:                           let
adamc@211:                               fun found (x, n) =
adamc@211:                                   (CM.insert (classes,
adamc@211:                                               ClProj (m1, ms, x),
adamc@211:                                               empty_class),
adamc@216:                                    IM.insert (newClasses, n, x),
adamc@218:                                    sgiSeek (#1 sgi, fmap),
adamc@218:                                    env)
adamc@216: 
adamc@218:                               fun default () = (classes, newClasses, sgiSeek (#1 sgi, fmap), env)
adamc@211:                           in
adamc@211:                               case #1 sgi of
adamc@217:                                   SgiStr (x, _, sgn) =>
adamc@217:                                   (enrichClasses env classes (m1, ms @ [x]) sgn,
adamc@217:                                    newClasses,
adamc@218:                                    sgiSeek (#1 sgi, fmap),
adamc@218:                                    env)
adamc@218:                                 | SgiSgn (x, n, sgn) =>
adamc@218:                                   (classes,
adamc@218:                                    newClasses,
adamc@218:                                    fmap,
adamc@218:                                    pushSgnNamedAs env x n sgn)
adamc@218: 
adamc@563:                                 | SgiClassAbs (x, n, _) => found (x, n)
adamc@563:                                 | SgiClass (x, n, _, _) => found (x, n)
adamc@674:                                 | SgiVal (x, n, c) =>
adamc@674:                                   (case rule_in c of
adamc@674:                                        NONE => default ()
adamc@711:                                      | SOME (cn, nvs, cs, c) =>
adamc@674:                                        let
adamc@711:                                            val loc = #2 c
adamc@721:                                            val globalize = sgnS_con' (m1, ms, fmap)
adamc@674: 
adamc@674:                                            val nc =
adamc@674:                                                case cn of
adamc@674:                                                    ClNamed f => IM.find (newClasses, f)
adamc@674:                                                  | _ => NONE
adamc@674:                                        in
adamc@674:                                            case nc of
adamc@674:                                                NONE =>
adamc@419:                                                let
adamc@419:                                                    val classes =
adamc@419:                                                        case CM.find (classes, cn) of
adamc@419:                                                            NONE => classes
adamc@419:                                                          | SOME class =>
adamc@419:                                                            let
adamc@711:                                                                val e = (EModProj (m1, ms, x), #2 sgn)
adamc@675: 
adamc@675:                                                                val class =
adamc@711:                                                                    {ground = #ground class,
adamc@711:                                                                     rules = (nvs,
adamc@711:                                                                              map globalize cs,
adamc@711:                                                                              globalize c,
adamc@711:                                                                              e) :: #rules class}
adamc@419:                                                            in
adamc@419:                                                                CM.insert (classes, cn, class)
adamc@419:                                                            end
adamc@419:                                                in
adamc@419:                                                    (classes,
adamc@419:                                                     newClasses,
adamc@419:                                                     fmap,
adamc@419:                                                     env)
adamc@419:                                                end
adamc@674:                                              | SOME fx =>
adamc@674:                                                let
adamc@674:                                                    val cn = ClProj (m1, ms, fx)
adamc@419: 
adamc@674:                                                    val classes =
adamc@674:                                                        case CM.find (classes, cn) of
adamc@674:                                                            NONE => classes
adamc@674:                                                          | SOME class =>
adamc@674:                                                            let
adamc@675:                                                                val e = (EModProj (m1, ms, x), #2 sgn)
adamc@675: 
adamc@675:                                                                val class = 
adamc@711:                                                                    {ground = #ground class,
adamc@711:                                                                     rules = (nvs,
adamc@711:                                                                              map globalize cs,
adamc@711:                                                                              globalize c,
adamc@711:                                                                              e) :: #rules class}
adamc@674:                                                            in
adamc@674:                                                                CM.insert (classes, cn, class)
adamc@674:                                                            end
adamc@674:                                                in
adamc@674:                                                    (classes,
adamc@674:                                                     newClasses,
adamc@674:                                                     fmap,
adamc@674:                                                     env)
adamc@674:                                                end
adamc@674:                                        end)
adamc@216:                                 | _ => default ()
adamc@211:                           end)
adamc@218:                       (classes, IM.empty, (IM.empty, IM.empty, IM.empty), env) sgis
adamc@211:         in
adamc@211:             classes
adamc@211:         end
adamc@211:       | _ => classes
adamc@211: 
adamc@211: fun pushStrNamedAs (env : env) x n sgn =
adamc@623:     {renameK = #renameK env,
adamc@623:      relK = #relK env,
adamc@623: 
adamc@623:      renameC = #renameC env,
adamc@211:      relC = #relC env,
adamc@211:      namedC = #namedC env,
adamc@211: 
adamc@211:      datatypes = #datatypes env,
adamc@211:      constructors = #constructors env,
adamc@211: 
adamc@211:      classes = enrichClasses env (#classes env) (n, []) sgn,
adamc@211: 
adamc@211:      renameE = #renameE env,
adamc@211:      relE = #relE env,
adamc@211:      namedE = #namedE env,
adamc@211: 
adamc@211:      renameSgn = #renameSgn env,
adamc@211:      sgn = #sgn env,
adamc@211: 
adamc@211:      renameStr = SM.insert (#renameStr env, x, (n, sgn)),
adamc@211:      str = IM.insert (#str env, n, (x, sgn))}
adamc@211: 
adamc@211: fun pushStrNamed env x sgn =
adamc@211:     let
adamc@211:         val n = !namedCounter
adamc@211:     in
adamc@211:         namedCounter := n + 1;
adamc@211:         (pushStrNamedAs env x n sgn, n)
adamc@211:     end
adamc@211: 
adamc@211: fun sgiBinds env (sgi, loc) =
adamc@211:     case sgi of
adamc@211:         SgiConAbs (x, n, k) => pushCNamedAs env x n k NONE
adamc@211:       | SgiCon (x, n, k, c) => pushCNamedAs env x n k (SOME c)
adamc@211:       | SgiDatatype (x, n, xs, xncs) =>
adamc@211:         let
adamc@341:             val k = (KType, loc)
adamc@341:             val k' = foldr (fn (_, k') => (KArrow (k, k'), loc)) k xs
adamc@341: 
adamc@341:             val env = pushCNamedAs env x n k' NONE
adamc@211:         in
adamc@211:             foldl (fn ((x', n', to), env) =>
adamc@211:                       let
adamc@211:                           val t =
adamc@211:                               case to of
adamc@211:                                   NONE => (CNamed n, loc)
adamc@211:                                 | SOME t => (TFun (t, (CNamed n, loc)), loc)
adamc@211: 
adamc@211:                           val k = (KType, loc)
adamc@211:                           val t = foldr (fn (x, t) => (TCFun (Explicit, x, k, t), loc)) t xs
adamc@211:                       in
adamc@211:                           pushENamedAs env x' n' t
adamc@211:                       end)
adamc@211:             env xncs
adamc@211:         end
adamc@211:       | SgiDatatypeImp (x, n, m1, ms, x', xs, xncs) =>
adamc@211:         let
adamc@341:             val k = (KType, loc)
adamc@341:             val k' = foldr (fn (_, k') => (KArrow (k, k'), loc)) k xs
adamc@341: 
adamc@341:             val env = pushCNamedAs env x n k' (SOME (CModProj (m1, ms, x'), loc))
adamc@211:         in
adamc@211:             foldl (fn ((x', n', to), env) =>
adamc@211:                       let
adamc@211:                           val t =
adamc@211:                               case to of
adamc@211:                                   NONE => (CNamed n, loc)
adamc@211:                                 | SOME t => (TFun (t, (CNamed n, loc)), loc)
adamc@211: 
adamc@211:                           val k = (KType, loc)
adamc@211:                           val t = foldr (fn (x, t) => (TCFun (Explicit, x, k, t), loc)) t xs
adamc@211:                       in
adamc@211:                           pushENamedAs env x' n' t
adamc@211:                       end)
adamc@211:             env xncs
adamc@211:         end
adamc@211:       | SgiVal (x, n, t) => pushENamedAs env x n t
adamc@211:       | SgiStr (x, n, sgn) => pushStrNamedAs env x n sgn
adamc@211:       | SgiSgn (x, n, sgn) => pushSgnNamedAs env x n sgn
adamc@211:       | SgiConstraint _ => env
adamc@211: 
adamc@711:       | SgiClassAbs (x, n, k) => pushCNamedAs env x n k NONE
adamc@711:       | SgiClass (x, n, k, c) => pushCNamedAs env x n k (SOME c)
adamc@459: 
adamc@211: fun sgnSubCon x =
adamc@211:     ElabUtil.Con.map {kind = id,
adamc@211:                       con = sgnS_con x}
adamc@59: 
adamc@59: fun projectStr env {sgn, str, field} =
adamc@59:     case #1 (hnormSgn env sgn) of
adamc@59:         SgnConst sgis =>
adamc@59:         (case sgnSeek (fn SgiStr (x, _, sgn) => if x = field then SOME sgn else NONE | _ => NONE) sgis of
adamc@59:              NONE => NONE
adamc@59:            | SOME (sgn, subs) => SOME (sgnSubSgn (str, subs) sgn))
adamc@59:       | SgnError => SOME (SgnError, ErrorMsg.dummySpan)
adamc@59:       | _ => NONE
adamc@59: 
adamc@158: fun chaseMpath env (n, ms) =
adamc@158:     let
adamc@158:         val (_, sgn) = lookupStrNamed env n
adamc@158:     in
adamc@158:         foldl (fn (m, (str, sgn)) =>
adamc@158:                                    case projectStr env {sgn = sgn, str = str, field = m} of
adamc@158:                                        NONE => raise Fail "kindof: Unknown substructure"
adamc@158:                                      | SOME sgn => ((StrProj (str, m), #2 sgn), sgn))
adamc@158:                                ((StrVar n, #2 sgn), sgn) ms
adamc@158:     end
adamc@158: 
adamc@42: fun projectCon env {sgn, str, field} =
adamc@42:     case #1 (hnormSgn env sgn) of
adamc@34:         SgnConst sgis =>
adamc@34:         (case sgnSeek (fn SgiConAbs (x, _, k) => if x = field then SOME (k, NONE) else NONE
adamc@34:                         | SgiCon (x, _, k, c) => if x = field then SOME (k, SOME c) else NONE
adamc@341:                         | SgiDatatype (x, _, xs, _) =>
adamc@158:                           if x = field then
adamc@341:                               let
adamc@341:                                   val k = (KType, #2 sgn)
adamc@341:                                   val k' = foldl (fn (_, k') => (KArrow (k, k'), #2 sgn)) k xs
adamc@341:                               in
adamc@341:                                   SOME (k', NONE)
adamc@341:                               end
adamc@341:                           else
adamc@341:                               NONE
adamc@341:                         | SgiDatatypeImp (x, _, m1, ms, x', xs, _) =>
adamc@341:                           if x = field then
adamc@341:                               let
adamc@341:                                   val k = (KType, #2 sgn)
adamc@341:                                   val k' = foldl (fn (_, k') => (KArrow (k, k'), #2 sgn)) k xs
adamc@341:                               in
adamc@341:                                   SOME (k', SOME (CModProj (m1, ms, x'), #2 sgn))
adamc@341:                               end
adamc@158:                           else
adamc@158:                               NONE
adamc@563:                         | SgiClassAbs (x, _, k) => if x = field then
adamc@563:                                                        SOME ((KArrow (k, (KType, #2 sgn)), #2 sgn), NONE)
adamc@563:                                                    else
adamc@563:                                                        NONE
adamc@563:                         | SgiClass (x, _, k, c) => if x = field then
adamc@563:                                                        SOME ((KArrow (k, (KType, #2 sgn)), #2 sgn), SOME c)
adamc@563:                                                    else
adamc@563:                                                        NONE
adamc@34:                         | _ => NONE) sgis of
adamc@34:              NONE => NONE
adamc@34:            | SOME ((k, co), subs) => SOME (k, Option.map (sgnSubCon (str, subs)) co))
adamc@34:       | SgnError => SOME ((KError, ErrorMsg.dummySpan), SOME (CError, ErrorMsg.dummySpan))
adamc@42:       | _ => NONE
adamc@34: 
adamc@157: fun projectDatatype env {sgn, str, field} =
adamc@157:     case #1 (hnormSgn env sgn) of
adamc@157:         SgnConst sgis =>
adamc@191:         (case sgnSeek (fn SgiDatatype (x, _, xs, xncs) => if x = field then SOME (xs, xncs) else NONE
adamc@191:                         | SgiDatatypeImp (x, _, _, _, _, xs, xncs) => if x = field then SOME (xs, xncs) else NONE
adamc@157:                         | _ => NONE) sgis of
adamc@157:              NONE => NONE
adamc@191:            | SOME ((xs, xncs), subs) => SOME (xs,
adamc@191:                                               map (fn (x, n, to) => (x, n, Option.map (sgnSubCon (str, subs)) to)) xncs))
adamc@157:       | _ => NONE
adamc@157: 
adamc@174: fun projectConstructor env {sgn, str, field} =
adamc@174:     case #1 (hnormSgn env sgn) of
adamc@174:         SgnConst sgis =>
adamc@174:         let
adamc@191:             fun consider (n, xs, xncs) =
adamc@174:                 ListUtil.search (fn (x, n', to) =>
adamc@174:                                     if x <> field then
adamc@174:                                         NONE
adamc@174:                                     else
adamc@191:                                         SOME (U.classifyDatatype xncs, n', xs, to, (CNamed n, #2 str))) xncs
adamc@174:         in
adamc@191:             case sgnSeek (fn SgiDatatype (_, n, xs, xncs) => consider (n, xs, xncs)
adamc@191:                            | SgiDatatypeImp (_, n, _, _, _, xs, xncs) => consider (n, xs, xncs)
adamc@174:                            | _ => NONE) sgis of
adamc@174:                 NONE => NONE
adamc@191:               | SOME ((dk, n, xs, to, t), subs) => SOME (dk, n, xs, Option.map (sgnSubCon (str, subs)) to,
adamc@191:                                                          sgnSubCon (str, subs) t)
adamc@174:         end
adamc@174:       | _ => NONE
adamc@174: 
adamc@42: fun projectVal env {sgn, str, field} =
adamc@42:     case #1 (hnormSgn env sgn) of
adamc@34:         SgnConst sgis =>
adamc@162:         let
adamc@191:             fun seek (n, xs, xncs) =
adamc@162:                 ListUtil.search (fn (x, _, to) =>
adamc@162:                                     if x = field then
adamc@191:                                         SOME (let
adamc@467:                                                   val base = (CNamed n, #2 sgn)
adamc@467:                                                   val nxs = length xs
adamc@467:                                                   val base = ListUtil.foldli (fn (i, _, base) =>
adamc@467:                                                                                  (CApp (base,
adamc@467:                                                                                        (CRel (nxs - i - 1), #2 sgn)),
adamc@467:                                                                                   #2 sgn))
adamc@467:                                                                              base xs
adamc@467: 
adamc@191:                                                   val t =
adamc@191:                                                       case to of
adamc@467:                                                           NONE => base
adamc@467:                                                         | SOME t => (TFun (t, base), #2 sgn)
adamc@191:                                                   val k = (KType, #2 sgn)
adamc@191:                                               in
adamc@467:                                                   foldr (fn (x, t) => (TCFun (Implicit, x, k, t), #2 sgn))
adamc@191:                                                   t xs
adamc@191:                                               end)
adamc@162:                                     else
adamc@162:                                         NONE) xncs
adamc@162:         in
adamc@162:             case sgnSeek (fn SgiVal (x, _, c) => if x = field then SOME c else NONE
adamc@191:                            | SgiDatatype (_, n, xs, xncs) => seek (n, xs, xncs)
adamc@191:                            | SgiDatatypeImp (_, n, _, _, _, xs, xncs) => seek (n, xs, xncs)
adamc@162:                            | _ => NONE) sgis of
adamc@162:                 NONE => NONE
adamc@162:               | SOME (c, subs) => SOME (sgnSubCon (str, subs) c)
adamc@162:         end
adamc@34:       | SgnError => SOME (CError, ErrorMsg.dummySpan)
adamc@42:       | _ => NONE
adamc@34: 
adamc@88: fun sgnSeekConstraints (str, sgis) =
adamc@88:     let
adamc@88:         fun seek (sgis, sgns, strs, cons, acc) =
adamc@88:             case sgis of
adamc@88:                 [] => acc
adamc@88:               | (sgi, _) :: sgis =>
adamc@88:                 case sgi of
adamc@88:                     SgiConstraint (c1, c2) =>
adamc@88:                     let
adamc@88:                         val sub = sgnSubCon (str, (sgns, strs, cons))
adamc@88:                     in
adamc@88:                         seek (sgis, sgns, strs, cons, (sub c1, sub c2) :: acc)
adamc@88:                     end
adamc@88:                   | SgiConAbs (x, n, _) => seek (sgis, sgns, strs, IM.insert (cons, n, x), acc)
adamc@88:                   | SgiCon (x, n, _, _) => seek (sgis, sgns, strs, IM.insert (cons, n, x), acc)
adamc@191:                   | SgiDatatype (x, n, _, _) => seek (sgis, sgns, strs, IM.insert (cons, n, x), acc)
adamc@191:                   | SgiDatatypeImp (x, n, _, _, _, _, _) => seek (sgis, sgns, strs, IM.insert (cons, n, x), acc)
adamc@88:                   | SgiVal _ => seek (sgis, sgns, strs, cons, acc)
adamc@88:                   | SgiSgn (x, n, _) => seek (sgis, IM.insert (sgns, n, x), strs, cons, acc)
adamc@88:                   | SgiStr (x, n, _) => seek (sgis, sgns, IM.insert (strs, n, x), cons, acc)
adamc@563:                   | SgiClassAbs (x, n, _) => seek (sgis, sgns, strs, IM.insert (cons, n, x), acc)
adamc@563:                   | SgiClass (x, n, _, _) => seek (sgis, sgns, strs, IM.insert (cons, n, x), acc)
adamc@88:     in
adamc@88:         seek (sgis, IM.empty, IM.empty, IM.empty, [])
adamc@88:     end
adamc@88: 
adamc@88: fun projectConstraints env {sgn, str} =
adamc@88:     case #1 (hnormSgn env sgn) of
adamc@88:         SgnConst sgis => SOME (sgnSeekConstraints (str, sgis))
adamc@88:       | SgnError => SOME []
adamc@88:       | _ => NONE
adamc@34: 
adamc@447: fun edeclBinds env (d, loc) =
adamc@447:     case d of
adamc@447:         EDVal (x, t, _) => pushERel env x t
adamc@447:       | EDValRec vis => foldl (fn ((x, t, _), env) => pushERel env x t) env vis
adamc@447: 
adamc@157: fun declBinds env (d, loc) =
adamc@157:     case d of
adamc@157:         DCon (x, n, k, c) => pushCNamedAs env x n k (SOME c)
adamc@191:       | DDatatype (x, n, xs, xncs) =>
adamc@157:         let
adamc@297:             val k = (KType, loc) 
adamc@297:             val nxs = length xs
adamc@297:             val (tb, kb) = ListUtil.foldli (fn (i, x', (tb, kb)) =>
adamc@297:                                                ((CApp (tb, (CRel (nxs - i - 1), loc)), loc),
adamc@297:                                                 (KArrow (k, kb), loc)))
adamc@297:                                            ((CNamed n, loc), k) xs
adamc@297:                                               
adamc@297:             val env = pushCNamedAs env x n kb NONE
adamc@191:             val env = pushDatatype env n xs xncs
adamc@157:         in
adamc@191:             foldl (fn ((x', n', to), env) =>
adamc@191:                       let
adamc@191:                           val t =
adamc@191:                               case to of
adamc@297:                                   NONE => tb
adamc@297:                                 | SOME t => (TFun (t, tb), loc)
adamc@297:                           val t = foldr (fn (x, t) => (TCFun (Implicit, x, k, t), loc)) t xs
adamc@191:                       in
adamc@191:                           pushENamedAs env x' n' t
adamc@191:                       end)
adamc@191:                   env xncs
adamc@157:         end
adamc@191:       | DDatatypeImp (x, n, m, ms, x', xs, xncs) =>
adamc@157:         let
adamc@157:             val t = (CModProj (m, ms, x'), loc)
adamc@297:             val k = (KType, loc) 
adamc@297:             val nxs = length xs
adamc@297:             val (tb, kb) = ListUtil.foldli (fn (i, x', (tb, kb)) =>
adamc@297:                                                ((CApp (tb, (CRel (nxs - i - 1), loc)), loc),
adamc@297:                                                 (KArrow (k, kb), loc)))
adamc@297:                                            ((CNamed n, loc), k) xs
adamc@297: 
adamc@341:             val env = pushCNamedAs env x n kb (SOME t)
adamc@191:             val env = pushDatatype env n xs xncs
adamc@157:         in
adamc@191:             foldl (fn ((x', n', to), env) =>
adamc@191:                       let
adamc@191:                           val t =
adamc@191:                               case to of
adamc@297:                                   NONE => tb
adamc@297:                                 | SOME t => (TFun (t, tb), loc)
adamc@297:                           val t = foldr (fn (x, t) => (TCFun (Implicit, x, k, t), loc)) t xs
adamc@191:                       in
adamc@191:                           pushENamedAs env x' n' t
adamc@191:                       end)
adamc@191:                   env xncs
adamc@157:         end
adamc@157:       | DVal (x, n, t, _) => pushENamedAs env x n t
adamc@157:       | DValRec vis => foldl (fn ((x, n, t, _), env) => pushENamedAs env x n t) env vis
adamc@157:       | DSgn (x, n, sgn) => pushSgnNamedAs env x n sgn
adamc@157:       | DStr (x, n, sgn, _) => pushStrNamedAs env x n sgn
adamc@157:       | DFfiStr (x, n, sgn) => pushStrNamedAs env x n sgn
adamc@157:       | DConstraint _ => env
adamc@157:       | DExport _ => env
adamc@707:       | DTable (tn, x, n, c, _, pc, _, cc) =>
adamc@205:         let
adamc@705:             val ct = (CModProj (tn, [], "sql_table"), loc)
adamc@705:             val ct = (CApp (ct, c), loc)
adamc@707:             val ct = (CApp (ct, (CConcat (pc, cc), loc)), loc)
adamc@338:         in
adamc@705:             pushENamedAs env x n ct
adamc@338:         end
adamc@338:       | DSequence (tn, x, n) =>
adamc@338:         let
adamc@338:             val t = (CModProj (tn, [], "sql_sequence"), loc)
adamc@205:         in
adamc@205:             pushENamedAs env x n t
adamc@205:         end
adamc@754:       | DView (tn, x, n, _, c) =>
adamc@754:         let
adamc@754:             val ct = (CModProj (tn, [], "sql_view"), loc)
adamc@754:             val ct = (CApp (ct, c), loc)
adamc@754:         in
adamc@754:             pushENamedAs env x n ct
adamc@754:         end
adamc@563:       | DClass (x, n, k, c) =>
adamc@213:         let
adamc@563:             val k = (KArrow (k, (KType, loc)), loc)
adamc@213:             val env = pushCNamedAs env x n k (SOME c)
adamc@213:         in
adamc@213:             pushClass env n
adamc@213:         end
adamc@271:       | DDatabase _ => env
adamc@459:       | DCookie (tn, x, n, c) =>
adamc@459:         let
adamc@459:             val t = (CApp ((CModProj (tn, [], "cookie"), loc), c), loc)
adamc@459:         in
adamc@459:             pushENamedAs env x n t
adamc@459:         end
adamc@720:       | DStyle (tn, x, n) =>
adamc@718:         let
adamc@720:             val t = (CModProj (tn, [], "css_class"), loc)
adamc@718:         in
adamc@718:             pushENamedAs env x n t
adamc@718:         end
adamc@157: 
adamc@243: fun patBinds env (p, loc) =
adamc@243:     case p of
adamc@243:         PWild => env
adamc@243:       | PVar (x, t) => pushERel env x t
adamc@243:       | PPrim _ => env
adamc@243:       | PCon (_, _, _, NONE) => env
adamc@243:       | PCon (_, _, _, SOME p) => patBinds env p
adamc@243:       | PRecord xps => foldl (fn ((_, p, _), env) => patBinds env p) env xps
adamc@243: 
adamc@2: end