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T2494.hs:15:7:
Couldn't match type `a' with `b'
`a' is a rigid type variable bound by
the RULE "foo/foo" at T2494.hs:13:46
`b' is a rigid type variable bound by
the RULE "foo/foo" at T2494.hs:14:46
Expected type: Maybe (m b) -> Maybe (m b)
Actual type: Maybe (m a) -> Maybe (m a)
In the first argument of `foo', namely `f'
In the expression: foo f (foo g x)
T2494.hs:15:30:
Couldn't match type `b' with `a'
`b' is a rigid type variable bound by
the RULE "foo/foo" at T2494.hs:14:46
`a' is a rigid type variable bound by
the RULE "foo/foo" at T2494.hs:13:46
Expected type: Maybe (m b) -> Maybe (m a)
Actual type: Maybe (m b) -> Maybe (m b)
In the second argument of `(.)', namely `g'
In the first argument of `foo', namely `(f . g)'
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