Bad error message for omitting -XExistentialQuantification flag

[tim]

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.

[simonpj]

Fixed by

Fri Feb 22 18:26:46 GMT 2008  simonpj@microsoft.com
  * Fix Trac #2114: error reporting for 'forall' without appropriate flags

This is a mixture of parser and renamer improvements. Still a bit ad-hoc, but better than before.

Simon

[igloo]

Merged