Add a warning for pattern synonyms without signatures
It is accepted as good style that top-level definitions should have type signatures. Pattern synonyms seem no different to me in this regard so I think it would be good if GHC warned if there was a pattern synonym definition which lacked a type signature.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.10.2 |
| Type | FeatureRequest |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
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| Architecture |