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tcfail040.hs:19:5: error:
No instance for (ORD a0) arising from a use of ‘<<’
The type variable ‘a0’ is ambiguous
Potential instances:
instance ORD (a -> b) -- Defined at tcfail040.hs:17:10
In the first argument of ‘(===)’, namely ‘(<<)’
In the expression: (<<) === (<<)
In an equation for ‘f’: f = (<<) === (<<)
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