GHC sometimes misses a CUSK
{-# LANGUAGE TypeInType #-}
data Test (a :: x) (b :: x) :: x -> *
where K :: Test Int Bool Double
fails, because GHC thinks that Test
does not have a CUSK.
It should have a CUSK, because while there is no forall x
in the result kind, the x
is in scope from previous use in kinds.
Fix en route.
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 |