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T7264.hs:13:19:
Couldn't match type ‘a’ with ‘forall r. r -> String’
‘a’ is a rigid type variable bound by
the inferred type of mkFoo2 :: a -> Maybe Foo at T7264.hs:13:1
Expected type: a -> Foo
Actual type: (forall r. r -> String) -> Foo
Relevant bindings include
val :: a (bound at T7264.hs:13:8)
mkFoo2 :: a -> Maybe Foo (bound at T7264.hs:13:1)
In the first argument of ‘mmap’, namely ‘Foo’
In the expression: mmap Foo (Just val)
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