GHC 5.0 fails test tc109.hs
Compiler sez:
Illegal instance declaration for `P b'
(There must be at least one non-type-variable in the
instance head)
despite there being ample type-vars in the head ;-)Trac metadata
| Trac field | Value |
|---|---|
| Version | None |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | ResolvedInvalid |
| Component | Compiler (Type checker) |
| Test case | |
| Differential revisions | |
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| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |