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tcfail171.hs:9:10: error:
• No instance for (PrintfArg a) arising from a use of ‘printf’
Possible fix:
add (PrintfArg a) to the context of
the type signature for:
phex :: a -> b
• In the expression: printf "0x%x" x
In an equation for ‘phex’: phex x = printf "0x%x" x
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