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tcfail171.hs:9:10:
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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