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tcfail040.hs:19:5: error: [GHC-39999]
• Ambiguous type variable ‘a0’ arising from a use of ‘<<’
prevents the constraint ‘(ORD a0)’ from being solved.
Probable fix: use a type annotation to specify what ‘a0’ should be.
Potentially matching instance:
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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