#4174: Jumbled error message from type family operator
---------------------------------+------------------------------------------
Reporter: lilac | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler (Type checker)
Version: 6.12.1 | Keywords:
Os: Unknown/Multiple | Testcase:
Architecture: Unknown/Multiple | Failure: Incorrect warning at
compile-time
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The attached file produces this error message:
{{{
Testcase.hs:82:0:
Couldn't match expected type `True'
against inferred type `Main.R::<=:GHC6'10GHC6'8 Minor1 minor'
When generalising the type(s) for `testcase'
}}}
That should say
{{{
[...] against inferred type `GHC6'10 Minor1 :<=: GHC6'8 minor'
}}}
Apologies for the complexity of the testcase; simpler testcases seem to
not reproduce the problem.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4174>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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