#2114: Bad error message for omitting -XExistentialQuantification flag
------------------------+---------------------------------------------------
Reporter: tim | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler (Type checker)
Version: 6.8.2 | Severity: minor
Keywords: | Testcase:
Architecture: Unknown | Os: Unknown
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If I compile this program:
{{{
module Foo where
data T = forall a . MkT a
}}}
with:
{{{
ghc-6.8.1 extest.hs -c
}}}
I get the error:
{{{
extest.hs:3:9: Not a constructor: `forall'
}}}
I think it would be a better error message to suggest passing in the
-XExistentialQuantification flag.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2114>
GHC <http://www.haskell.org/ghc/>
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