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  • Glasgow Haskell CompilerGlasgow Haskell Compiler
  • GHCGHC
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  • #2114
Closed
Open
Issue created Feb 20, 2008 by chevalier@alum.wellesley.edu@trac-chevalier

Bad error message for omitting -XExistentialQuantification flag

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.

Trac metadata
Trac field Value
Version 6.8.2
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler (Type checker)
Test case
Differential revisions
BlockedBy
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Blocking
CC
Operating system Unknown
Architecture Unknown
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