EmptyDataDecls and type context
the following code fails to parse correctly or typecheck under 6.12.1
{-# LANGUAGE EmptyDataDecls #-}
data Show a => Foo aerror:
No context is allowed on a GADT-style data declaration
(You can put a context on each contructor, though.)it works with 6.10.
this is the reason of HList failure on 6.12.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 6.12.1 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
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| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |