diff options
Diffstat (limited to 'compiler/typecheck/TcUnify.hs')
| -rw-r--r-- | compiler/typecheck/TcUnify.hs | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/compiler/typecheck/TcUnify.hs b/compiler/typecheck/TcUnify.hs index 9f9e69850d..af83536f00 100644 --- a/compiler/typecheck/TcUnify.hs +++ b/compiler/typecheck/TcUnify.hs @@ -960,7 +960,7 @@ ir_inst = False: do not instantiate (let { f :: forall a. a -> a; f x = x } in f) @Int We'll call TcExpr.tcInferFun to infer the type of the (let .. in f) - And we don't want to instantite the type of 'f' when we reach it, + And we don't want to instantiate the type of 'f' when we reach it, else the outer visible type application won't work 2. :type +v. When we say @@ -1137,7 +1137,7 @@ tcSkolemise ctxt expected_ty thing_inside text "given" <+> ppr given, text "inst type" <+> ppr rho' ] - -- Generally we must check that the "forall_tvs" havn't been constrained + -- Generally we must check that the "forall_tvs" haven't been constrained -- The interesting bit here is that we must include the free variables -- of the expected_ty. Here's an example: -- runST (newVar True) @@ -2152,7 +2152,7 @@ This is legal; e.g. dependent/should_compile/T11635. We don't want to reject it because of the forall in beta's kind, but (see Note [Occurrence checking: look inside kinds]) we do need to look in beta's kind. So we carry a flag saying if a 'forall' -is OK, and sitch the flag on when stepping inside a kind. +is OK, and switch the flag on when stepping inside a kind. Why is it OK? Why does it not count as impredicative polymorphism? The reason foralls are bad is because we reply on "seeing" foralls |