NamedWildcardInDataFamilyInstanceLHS.stderr\should_fail\partial-sigs\tests\testsuite - delta/haskell.git - gitlab.haskell.org: ghc/ghc.git

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NamedWildcardInDataFamilyInstanceLHS.hs:8:21: error:
    Wildcard ‘_a’ not allowed
      in a type pattern of family instance for ‘Sing’