#2294: Misleading error message suggestion
-----------------------------+----------------------------------------------
Reporter: NeilMitchell | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.8.2 | Severity: normal
Keywords: | Testcase:
Architecture: Unknown | Os: Unknown
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Given a rank-2 type, such as:
{{{
id :: forall a . a -> a
id x = x
}}}
The compiler complains:
{{{
Uniplate.hs:3:15:
Illegal operator `.' in type `forall a . (a -> a)'
(Use -XTypeOperators to allow operators in types)
}}}
Of course, people using {{{`.'}}} in a type signature are much more likely
to be aiming for {{{Rank2Types}}} - so perhaps in this one type operator
the suggestion should be towards rank-2 types.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2294>
GHC <http://www.haskell.org/ghc/>
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