RFC, allow local bindings in pattern synonyms
Code from #11992 (closed), allow users to write something like
pattern Suc :: Int -> Int
pattern Suc n <- (hasSuc -> Just n)
where Suc n = n + 1
hasSuc :: Int -> Maybe Int
hasSuc n = [ n - 1 | n > 0 ]
Trac metadata
Trac field | Value |
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Version | |
Type | FeatureRequest |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
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Blocking | |
CC | |
Operating system | |
Architecture |