Bad error message for omitting -XExistentialQuantification flag
If I compile this program:
module Foo where
data T = forall a . MkT awith:
ghc-6.8.1 extest.hs -cI 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 |