apply h.
Defined.
-
-Variable Prelude_error : forall {A}, string -> A. Extract Inlined Constant Prelude_error => "Prelude.error".
-
(* information about a datacon/literal/default which is common to all instances of a branch with that tag *)
Section StrongAltCon.
Context (tc : TyCon)(dc:DataCon tc).
else update_ig ig vars' v'
end.
+(* does the specified variable occur free in the expression? *)
+Fixpoint doesWeakVarOccur (wev:WeakExprVar)(me:WeakExpr) : bool :=
+ match me with
+ | WELit _ => false
+ | WEVar cv => if eqd_dec (wev:CoreVar) (cv:CoreVar) then true else false
+ | WECast e co => doesWeakVarOccur wev e
+ | WENote n e => doesWeakVarOccur wev e
+ | WETyApp e t => doesWeakVarOccur wev e
+ | WECoApp e co => doesWeakVarOccur wev e
+ | WEBrak _ ec e _ => doesWeakVarOccur wev e
+ | WEEsc _ ec e _ => doesWeakVarOccur wev e
+ | WECSP _ ec e _ => doesWeakVarOccur wev e
+ | WELet cv e1 e2 => doesWeakVarOccur wev e1 || (if eqd_dec (wev:CoreVar) (cv:CoreVar)then false else doesWeakVarOccur wev e2)
+ | WEApp e1 e2 => doesWeakVarOccur wev e1 || doesWeakVarOccur wev e2
+ | WELam cv e => if eqd_dec (wev:CoreVar) (cv:CoreVar) then false else doesWeakVarOccur wev e
+ | WETyLam cv e => doesWeakVarOccur wev e
+ | WECoLam cv e => doesWeakVarOccur wev e
+ | WECase vscrut escrut tbranches tc avars alts =>
+ doesWeakVarOccur wev escrut ||
+ if eqd_dec (wev:CoreVar) (vscrut:CoreVar) then false else
+ ((fix doesWeakVarOccurAlts alts {struct alts} : bool :=
+ match alts with
+ | T_Leaf None => false
+ | T_Leaf (Some (WeakDEFAULT,_,_,_,e)) => doesWeakVarOccur wev e
+ | T_Leaf (Some (WeakLitAlt lit,_,_,_,e)) => doesWeakVarOccur wev e
+ | T_Leaf (Some ((WeakDataAlt dc), tvars, cvars, evars,e)) => doesWeakVarOccur wev e (* FIXME!!! *)
+ | T_Branch b1 b2 => doesWeakVarOccurAlts b1 || doesWeakVarOccurAlts b2
+ end) alts)
+ | WELetRec mlr e =>
+ doesWeakVarOccur wev e ||
+ (fix doesWeakVarOccurLetRec (mlr:Tree ??(WeakExprVar * WeakExpr)) : bool :=
+ match mlr with
+ | T_Leaf None => false
+ | T_Leaf (Some (cv,e)) => if eqd_dec (wev:CoreVar) (cv:CoreVar) then false else doesWeakVarOccur wev e
+ | T_Branch b1 b2 => doesWeakVarOccurLetRec b1 || doesWeakVarOccurLetRec b2
+ end) mlr
+ end.
+Fixpoint doesWeakVarOccurAlts (wev:WeakExprVar)
+ (alts:Tree ??(WeakAltCon * list WeakTypeVar * list WeakCoerVar * list WeakExprVar * WeakExpr)) : bool :=
+ match alts with
+ | T_Leaf None => false
+ | T_Leaf (Some (WeakDEFAULT,_,_,_,e)) => doesWeakVarOccur wev e
+ | T_Leaf (Some (WeakLitAlt lit,_,_,_,e)) => doesWeakVarOccur wev e
+ | T_Leaf (Some ((WeakDataAlt dc), tvars, cvars, evars,e)) => doesWeakVarOccur wev e (* FIXME!!! *)
+ | T_Branch b1 b2 => doesWeakVarOccurAlts wev b1 || doesWeakVarOccurAlts wev b2
+ end.
+
+(*Definition ensureCaseBindersAreNotUsed (we:WeakExpr) : UniqM WeakExpr := FIXME *)
+
Definition weakExprToStrongExpr : forall
(Γ:TypeEnv)
(Δ:CoercionEnv Γ)
| WELam ev ebody => weakTypeToTypeOfKind φ ev ★ >>= fun tv =>
weakTypeOfWeakExpr ebody >>= fun tbody =>
weakTypeToTypeOfKind φ tbody ★ >>= fun tbody' =>
- let ξ' := update_ξ ξ (((ev:CoreVar),tv@@lev)::nil) in
+ let ξ' := update_ξ ξ lev (((ev:CoreVar),tv)::nil) in
let ig' := update_ig ig ((ev:CoreVar)::nil) in
weakExprToStrongExpr Γ Δ φ ψ ξ' ig' tbody' lev ebody >>= fun ebody' =>
castExpr we "WELam" (τ@@lev) (ELam Γ Δ ξ tv tbody' lev ev ebody')
| WELet v ve ebody => weakTypeToTypeOfKind φ v ★ >>= fun tv =>
weakExprToStrongExpr Γ Δ φ ψ ξ ig tv lev ve >>= fun ve' =>
- weakExprToStrongExpr Γ Δ φ ψ (update_ξ ξ (((v:CoreVar),tv@@lev)::nil))
+ weakExprToStrongExpr Γ Δ φ ψ (update_ξ ξ lev (((v:CoreVar),tv)::nil))
(update_ig ig ((v:CoreVar)::nil)) τ lev ebody
>>= fun ebody' =>
OK (ELet _ _ _ tv _ lev (v:CoreVar) ve' ebody')
(ECast Γ Δ ξ t1' t2' (weakCoercionToHaskCoercion _ _ _ co) lev e')
| WELetRec rb e =>
- let ξ' := update_ξ ξ (map (fun x => ((fst x),(snd x @@ lev))) _) in
+ let ξ' := update_ξ ξ lev _ in
let ig' := update_ig ig (map (fun x:(WeakExprVar*_) => (fst x):CoreVar) (leaves rb)) in
let binds :=
(fix binds (t:Tree ??(WeakExprVar * WeakExpr))
| WECase vscrut escrut tbranches tc avars alts =>
weakTypeOfWeakExpr escrut >>= fun tscrut =>
weakTypeToTypeOfKind φ tscrut ★ >>= fun tscrut' =>
-(*
- let ξ' := update_ξ ξ (((vscrut:CoreVar),tscrut'@@lev)::nil) in
- let ig' := update_ig ig ((vscrut:CoreVar)::nil) in
-*)
- let ξ' := ξ in
- let ig' := ig in
- mkAvars avars (tyConKind tc) φ >>= fun avars' =>
+ if doesWeakVarOccurAlts vscrut alts
+ then Error "encountered a Case which actually used its binder - these should have been desugared away!!"
+ else mkAvars avars (tyConKind tc) φ >>= fun avars' =>
weakTypeToTypeOfKind φ tbranches ★ >>= fun tbranches' =>
(fix mkTree (t:Tree ??(WeakAltCon*list WeakTypeVar*list WeakCoerVar*list WeakExprVar*WeakExpr)) : ???(Tree
- ??{scb : StrongCaseBranchWithVVs CoreVar CoreVarEqDecidable tc avars' &
- Expr (sac_Γ scb Γ) (sac_Δ scb Γ avars' (weakCK'' Δ))(scbwv_ξ scb ξ' lev)(weakLT' (tbranches' @@ lev))}) :=
+ ??{ sac : _ & {scb : StrongCaseBranchWithVVs CoreVar CoreVarEqDecidable tc avars' sac &
+ Expr (sac_Γ sac Γ) (sac_Δ sac Γ avars' (weakCK'' Δ))(scbwv_ξ scb ξ lev)(weakLT' (tbranches' @@ lev))}}) :=
match t with
| T_Leaf None => OK []
| T_Leaf (Some (ac,extyvars,coervars,exprvars,ebranch)) =>
mkStrongAltConPlusJunk' tc ac >>= fun sac =>
list2vecOrFail (map (fun ev:WeakExprVar => ev:CoreVar) exprvars) _ (fun _ _ => "WECase")
>>= fun exprvars' =>
- let scb := @Build_StrongCaseBranchWithVVs CoreVar CoreVarEqDecidable tc Γ avars' sac exprvars' in
- weakExprToStrongExpr (sac_Γ scb Γ) (sac_Δ scb Γ avars' (weakCK'' Δ)) (sacpj_φ sac _ φ)
+ (let case_pf := tt in _) >>= fun pf =>
+ let scb := @Build_StrongCaseBranchWithVVs CoreVar CoreVarEqDecidable tc Γ avars' sac exprvars' pf in
+ weakExprToStrongExpr (sac_Γ sac Γ) (sac_Δ sac Γ avars' (weakCK'' Δ)) (sacpj_φ sac _ φ)
(sacpj_ψ sac _ _ avars' ψ)
- (scbwv_ξ scb ξ' lev)
- (update_ig ig' (map (@fst _ _) (vec2list (scbwv_varstypes scb))))
+ (scbwv_ξ scb ξ lev)
+ (update_ig ig (map (@fst _ _) (vec2list (scbwv_varstypes scb))))
(weakT' tbranches') (weakL' lev) ebranch >>= fun ebranch' =>
let case_case := tt in OK [ _ ]
| T_Branch b1 b2 =>
OK (b1',,b2')
end) alts >>= fun tree =>
- weakExprToStrongExpr Γ Δ φ ψ ξ ig (caseType tc avars') lev escrut >>= fun escrut' =>
- castExpr we "ECase" (τ@@lev) (ECase Γ Δ ξ' lev tc tbranches' avars' escrut' tree)
-(*
- weakExprToStrongExpr Γ Δ φ ψ ξ ig tscrut' lev escrut >>= fun escrut' =>
- castExpr we "ECaseScrut" (caseType tc avars' @@ lev) (EVar Γ Δ ξ' vscrut) >>= fun evscrut' =>
- castExpr we "ECase" (τ@@lev)
- (ELet Γ Δ ξ tscrut' tbranches' lev (vscrut:CoreVar) escrut'
- (ECase Γ Δ ξ' lev tc tbranches' avars' evscrut' tree))
-*)
- end)).
+ weakExprToStrongExpr Γ Δ φ ψ ξ ig (caseType tc avars') lev escrut >>= fun escrut' =>
+ castExpr we "ECase" (τ@@lev) (ECase Γ Δ ξ lev tc tbranches' avars' escrut' tree)
+ end)); try clear binds.
destruct case_some.
apply (addErrorMessage "case_some").
destruct e''; try apply (Error error_message).
apply OK.
apply ELR_leaf.
+ unfold ξ'.
+ simpl.
+ induction (leaves (varsTypes rb φ)).
+ simpl; auto.
+ destruct (ξ c).
+ simpl.
apply e1.
+ destruct case_pf.
+ set (distinct_decidable (vec2list exprvars')) as dec.
+ destruct dec; [ idtac | apply (Error "malformed HaskWeak: case branch with variables repeated") ].
+ apply OK; auto.
+
destruct case_case.
+ exists sac.
exists scb.
apply ebranch'.
projects / coq-hetmet.git / blobdiff