diff options
Diffstat (limited to 'compiler/GHC/Tc/Validity.hs')
| -rw-r--r-- | compiler/GHC/Tc/Validity.hs | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/compiler/GHC/Tc/Validity.hs b/compiler/GHC/Tc/Validity.hs index 9af0fbdeb5..4dc4161664 100644 --- a/compiler/GHC/Tc/Validity.hs +++ b/compiler/GHC/Tc/Validity.hs @@ -733,7 +733,7 @@ check_type ve (CastTy ty _) = check_type ve ty -- -- Critically, this case must come *after* the case for TyConApp. -- See Note [Liberal type synonyms]. -check_type ve@(ValidityEnv{ ve_tidy_env = env, ve_ctxt = ctxt +check_type ve@(ValidityEnv{ ve_tidy_env = env , ve_rank = rank, ve_expand = expand }) ty | not (null tvbs && null theta) = do { traceTc "check_type" (ppr ty $$ ppr rank) @@ -745,9 +745,7 @@ check_type ve@(ValidityEnv{ ve_tidy_env = env, ve_ctxt = ctxt -- Reject forall (a :: Eq b => b). blah -- In a kind signature we don't allow constraints - ; checkTcM (all (isInvisibleArgFlag . binderArgFlag) tvbs - || vdqAllowed ctxt) - (env, TcRnVDQInTermType (tidyType env ty)) + ; checkVdqOK ve tvbs ty -- Reject visible, dependent quantification in the type of a -- term (e.g., `f :: forall a -> a -> Maybe a`) @@ -938,6 +936,14 @@ checkConstraintsOK ve theta ty checkTcM (all isEqPred theta) (env, TcRnConstraintInKind (tidyType env ty)) where env = ve_tidy_env ve +checkVdqOK :: ValidityEnv -> [TyVarBinder] -> Type -> TcM () +checkVdqOK ve tvbs ty = do + checkTcM (vdqAllowed ctxt || no_vdq) + (env, TcRnVDQInTermType (Just (tidyType env ty))) + where + no_vdq = all (isInvisibleArgFlag . binderArgFlag) tvbs + ValidityEnv{ve_tidy_env = env, ve_ctxt = ctxt} = ve + {- Note [Liberal type synonyms] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |