[Git][ghc/ghc][wip/top-level-kind-signatures] Fix T16723 T16724: arity and instantiation
Vladislav Zavialov
gitlab at gitlab.haskell.org
Fri May 31 19:39:40 UTC 2019
Vladislav Zavialov pushed to branch wip/top-level-kind-signatures at Glasgow Haskell Compiler / GHC
Commits:
d0c418f6 by Vladislav Zavialov at 2019-05-31T19:39:06Z
Fix T16723 T16724: arity and instantiation
- - - - -
6 changed files:
- compiler/typecheck/TcTyClsDecls.hs
- + testsuite/tests/tlks/should_compile/T16723.hs
- + testsuite/tests/tlks/should_compile/T16724.hs
- + testsuite/tests/tlks/should_compile/T16724.script
- testsuite/tests/tlks/should_compile/all.T
- testsuite/tests/tlks/should_compile/tlks025.script
Changes:
=====================================
compiler/typecheck/TcTyClsDecls.hs
=====================================
@@ -1245,18 +1245,23 @@ kcDeclHeader name arityGuard flav ki ktvs kc_res_ki =
-> [(Name,TcTyVar)] -- accumulated scoped type variables, reversed
-> [LHsTyVarBndr GhcRn] -- the header binders
-> TcM TcTyCon
- go d_ki subst tcb_acc stv_acc bndrs@(b:bs) =
+ go d_ki subst tcb_acc stv_acc bndrs =
case tcSplitPiTy_maybe d_ki of
Just (Named (Bndr v' argFlag at Specified), d_ki') ->
- do { let b_ki = substTy subst (varType v')
- b_name = tyVarName v'
- ; tcv <- newSkolemTyVar b_name b_ki
- ; let tcb = mkNamedTyConBinder argFlag tcv
- stv = (b_name, tcv)
- subst' = extendTvSubst subst v' (mkTyVarTy tcv)
- ; tcExtendNameTyVarEnv [stv] $
- go d_ki' subst' (tcb:tcb_acc) (stv:stv_acc) bndrs
- }
+ case bndrs of
+ [] | KeepPoly keep_n <- arityGuard,
+ keep_n > 0
+ -> goSpecified1 keep_n d_ki subst tcb_acc stv_acc
+ _ ->
+ do { let b_ki = substTy subst (varType v')
+ b_name = tyVarName v'
+ ; tcv <- newSkolemTyVar b_name b_ki
+ ; let tcb = mkNamedTyConBinder argFlag tcv
+ stv = (b_name, tcv)
+ subst' = extendTvSubst subst v' (mkTyVarTy tcv)
+ ; tcExtendNameTyVarEnv [stv] $
+ go d_ki' subst' (tcb:tcb_acc) (stv:stv_acc) bndrs
+ }
Just (Named (Bndr v' argFlag at Inferred), d_ki') ->
do { let b_ki = substTy subst (varType v')
b_name = tyVarName v'
@@ -1273,32 +1278,39 @@ kcDeclHeader name arityGuard flav ki ktvs kc_res_ki =
; let tcb = mkAnonTyConBinder argFlag tcv
; go d_ki' subst (tcb:tcb_acc) stv_acc bndrs }
Just (Anon argFlag at VisArg bndr_ki, d_ki') ->
- do { let b_ki = substTy subst bndr_ki
- ; v_name <- checkVar b_ki b
- ; tcv <- newSkolemTyVar v_name b_ki
- ; let tcb = mkAnonTyConBinder argFlag tcv
- stv = (v_name, tcv)
- ; tcExtendNameTyVarEnv [stv] $
- go d_ki' subst (tcb:tcb_acc) (stv:stv_acc) bs
- }
+ case bndrs of
+ [] -> done (substTy subst d_ki) tcb_acc stv_acc
+ b:bs ->
+ do { let b_ki = substTy subst bndr_ki
+ ; v_name <- checkVar b_ki b
+ ; tcv <- newSkolemTyVar v_name b_ki
+ ; let tcb = mkAnonTyConBinder argFlag tcv
+ stv = (v_name, tcv)
+ ; tcExtendNameTyVarEnv [stv] $
+ go d_ki' subst (tcb:tcb_acc) (stv:stv_acc) bs
+ }
Just (Named (Bndr v' argFlag at Required), d_ki') ->
- do { let b_ki = substTy subst (varType v')
- b_name = tyVarName v'
- ; v_name <- checkVar b_ki b
- ; tcv <- newSkolemTyVar b_name b_ki
- ; let tcb = mkNamedTyConBinder argFlag tcv
- stv = (v_name, tcv)
- subst' = extendTvSubst subst v' (mkTyVarTy tcv)
- ; tcExtendNameTyVarEnv [stv] $
- go d_ki' subst' (tcb:tcb_acc) (stv:stv_acc) bs
- }
- Nothing -> failWithTc (tooManyBindersErr d_ki bndrs)
- go d_ki subst tcb_acc stv_acc [] =
+ case bndrs of
+ [] -> done (substTy subst d_ki) tcb_acc stv_acc
+ b:bs ->
+ do { let b_ki = substTy subst (varType v')
+ b_name = tyVarName v'
+ ; v_name <- checkVar b_ki b
+ ; tcv <- newSkolemTyVar b_name b_ki
+ ; let tcb = mkNamedTyConBinder argFlag tcv
+ stv = (v_name, tcv)
+ subst' = extendTvSubst subst v' (mkTyVarTy tcv)
+ ; tcExtendNameTyVarEnv [stv] $
+ go d_ki' subst' (tcb:tcb_acc) (stv:stv_acc) bs
+ }
+ Nothing ->
+ case bndrs of
+ [] -> done (substTy subst d_ki) tcb_acc stv_acc
+ _:_ -> failWithTc (tooManyBindersErr d_ki bndrs)
+
+ goSpecified1 keep_n d_ki subst tcb_acc stv_acc =
do { let (specified, d_ki') = tcSplitForAllTysExactVis Specified d_ki
- specified_n = length specified
- can_inst = case arityGuard of
- InstAll -> specified_n
- KeepPoly keep_n -> max 0 (specified_n - keep_n)
+ can_inst = max 0 (length specified - keep_n)
; traceTc "kcDeclHeader specified =" (ppr specified)
; traceTc "kcDeclHeader can_inst =" (ppr can_inst)
; goSpecified can_inst specified d_ki' subst tcb_acc stv_acc
=====================================
testsuite/tests/tlks/should_compile/T16723.hs
=====================================
@@ -0,0 +1,10 @@
+{-# LANGUAGE TopLevelKindSignatures #-}
+{-# LANGUAGE PolyKinds #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+
+module T16723 where
+
+import Data.Kind
+
+type D :: forall a. Type
+data D
=====================================
testsuite/tests/tlks/should_compile/T16724.hs
=====================================
@@ -0,0 +1,15 @@
+{-# LANGUAGE TopLevelKindSignatures #-}
+{-# LANGUAGE PolyKinds #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE TypeFamilies #-}
+
+module T16724 where
+
+import Data.Kind
+
+type T1 :: forall k (a :: k). Type
+type family T1
+
+-- type T2 :: forall {k} (a :: k). Type
+type T2 :: forall a. Type
+type family T2
=====================================
testsuite/tests/tlks/should_compile/T16724.script
=====================================
@@ -0,0 +1,5 @@
+:set -fprint-explicit-kinds -fprint-explicit-foralls -XNoStarIsType
+:load T16724.hs
+:info T1
+:info T2
+ -- must have the same arity!
=====================================
testsuite/tests/tlks/should_compile/all.T
=====================================
@@ -29,3 +29,5 @@ test('tlks026', normal, compile, [''])
test('tlks027', normal, compile, ['-v0 -ddump-splices -dsuppress-uniques'])
test('tlks028', normal, compile, [''])
test('tlks029', normal, compile, [''])
+test('T16723', normal, compile, [''])
+test('T16724', extra_files(['T16724.hs']), ghci_script, ['T16724.script'])
=====================================
testsuite/tests/tlks/should_compile/tlks025.script
=====================================
@@ -1,3 +1,3 @@
-:set -XTopLevelKindSignatures -XTypeFamilies -XNoStarIsType
+:set -XNoStarIsType
:load tlks025.hs
:kind T
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/commit/d0c418f63a06721a576b693a1dc3730c36439a0b
--
View it on GitLab: https://gitlab.haskell.org/ghc/ghc/commit/d0c418f63a06721a576b693a1dc3730c36439a0b
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