#7224: Polymorphic kind annotations on type classes don't always work as
expected
---------------------------------------+------------------------------------
Reporter: slindley | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler (Type
checker)
Version: 7.6.1-rc1 | Keywords: kind polymorphism
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: GHC rejects valid program | Testcase:
Blockedby: | Blocking:
Related: |
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Comment(by slindley):
If I'd actually switched on PolyKinds in ghci as well as the source file,
then I'd have got:
{{{
*Main> :t ret
ret :: PMonad k m => a -> m i i a
*Main> :t ret'
ret' :: PMonad' m => a -> m BOX BOX a
}}}
(The mysterious * disappears if {{{PolyKinds}}} is enabled.)
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7224#comment:1>
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