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 | |
Related | |
Blocking | |
CC | |
Operating system | Unknown |
Architecture | Unknown |