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tcfail040.hs:19:14:
Ambiguous type variable `a0' in the constraint:
(ORD a0) arising from a use of `<<'
Probable fix: add a type signature that fixes these type variable(s)
In the second argument of `(===)', namely `(<<)'
In the expression: (<<) === (<<)
In an equation for `f': f = (<<) === (<<)
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