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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 ]
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Type FeatureRequest
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
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