tcfail171.stderr 357 Bytes
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tcfail171.hs:9:9:
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    Could not deduce (PrintfArg a, PrintfType b) from the context ()
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      arising from a use of `printf' at tcfail171.hs:9:9-23
    Possible fix:
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      add (PrintfArg a, PrintfType b) to the context of
        the type signature for `phex'
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    In the expression: printf "0x%x" x
    In the definition of `phex': phex x = printf "0x%x" x