Typed Template Haskell sneakily allows impredicativity
The following module is accepted:
{-# LANGUAGE ExplicitForAll, TemplateHaskell #-}
module Bug where
impred :: forall a. a -> a
impred = $$( [|| \x -> x ||] )
But that requires an intermediate TExp (forall a. a -> a)
.
Will fix in ongoing work.
Trac metadata
Trac field | Value |
---|---|
Version | 8.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |