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ExtraConstraintsWildcardInPatternSplice.hs:5:6: error:
    • Found type wildcard ‘_’ standing for ‘_’
      Where: ‘_’ is a rigid type variable bound by
               the inferred type of foo :: _ -> ()
               at ExtraConstraintsWildcardInPatternSplice.hs:5:1-29
      To use the inferred type, enable PartialTypeSignatures
    • In a pattern type signature: _
      In the pattern: _ :: _
      In an equation for ‘foo’: foo (_ :: _) = ()
    • Relevant bindings include
        foo :: _ -> ()
          (bound at ExtraConstraintsWildcardInPatternSplice.hs:5:1)