T10463.hs:5:9: warning: [-Wpartial-type-signatures (in -Wdefault)]
    • Found type wildcard ‘_’ standing for ‘[Char]’
    • In a pattern type signature: _
      In the pattern: x :: _
      In an equation for ‘f’: f (x :: _) = x ++ ""
    • Relevant bindings include
        f :: [Char] -> [Char] (bound at T10463.hs:5:1)