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NamedWildcardsNotEnabled.hs:4:9:
Couldn't match expected type ‘_b’ with actual type ‘Bool’
‘_b’ is a rigid type variable bound by
the type signature for: foo :: _a -> _b
at NamedWildcardsNotEnabled.hs:3:8
In the expression: not x
In an equation for ‘foo’: foo x = not x
Relevant bindings include
foo :: _a -> _b (bound at NamedWildcardsNotEnabled.hs:4:1)
NamedWildcardsNotEnabled.hs:4:13:
Couldn't match expected type ‘Bool’ with actual type ‘_a’
‘_a’ is a rigid type variable bound by
the type signature for: foo :: _a -> _b
at NamedWildcardsNotEnabled.hs:3:8
In the first argument of ‘not’, namely ‘x’
In the expression: not x
Relevant bindings include
x :: _a (bound at NamedWildcardsNotEnabled.hs:4:5)
foo :: _a -> _b (bound at NamedWildcardsNotEnabled.hs:4:1)
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