tcfail165.stderr 561 Bytes
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tcfail165.hs:19:23: error:
    • Couldn't match expected type ‘forall a. Show a => a -> String’
                  with actual type ‘b0 -> String’
    • In the second argument of ‘putMVar’, namely
        ‘(show :: forall b. Show b => b -> String)’
      In a stmt of a 'do' block:
        putMVar var (show :: forall b. Show b => b -> String)
      In the expression:
        do { var <- newEmptyMVar ::
                      IO (MVar (forall a. Show a => a -> String));
             putMVar var (show :: forall b. Show b => b -> String) }