Disallow local pattern synonym declarations
Locally-defined pattern synonyms work by accident in GHC and crash GHCi (see #8749 (closed)), but certainly not by design. It can be confusing because it introduces shadowing to constructor-like names.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.8.1-rc1 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler (Type checker) |
| Test case | |
| Differential revisions | |
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| Architecture |