Require PatternSynonyms language extension to *use* pattern synonyms
To keep in the spirit of #2905, especially in light of the immaturity of the pattern synonyms extensions, GHC should require the PatternSynonyms
language extension to be turned on when encountering a pattern synonym occurance.
Trac metadata
Trac field | Value |
---|---|
Version | 7.8.1-rc2 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler (Type checker) |
Test case | |
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Operating system | |
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