#959: Debugging info(?) leaks out: "Urk! Inventing strangely-kinded void TyCon"
----------------------------------------+-----------------------------------
Reporter: igloo | Owner:
Type: bug | Status: new
Priority: normal | Milestone: 6.6.1
Component: Compiler (Type checker) | Version: 6.6
Severity: normal | Keywords:
Difficulty: Unknown | Testcase:
Architecture: Unknown | Os: Unknown
----------------------------------------+-----------------------------------
With GHC 6.6, this module:
{{{
module G where
testL = foo undefined
class Foo t where
foo :: m a -> t m a
}}}
leaks some debugging info(?):
{{{
Urk! Inventing strangely-kinded void TyCon:
:t{tc ae2}
(* -> *) -> * -> *
tmp.hs:4:8:
Ambiguous type variable `t' in the constraint:
`Foo t' arising from use of `foo' at tmp.hs:4:8-20
Possible cause: the monomorphism restriction applied to the following:
testL :: forall (m :: * -> *) a. t m a (bound at tmp.hs:4:0)
Probable fix: give these definition(s) an explicit type signature
or use -fno-monomorphism-restriction
}}}
I haven't managed to get this message in an acceptable program.
(found by fasta on IRC)
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/959>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler_______________________________________________
Glasgow-haskell-bugs mailing list
Glasgow-haskell-bugs@haskell.org
http://www.haskell.org/mailman/listinfo/glasgow-haskell-bugs
