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NamedWildcardExplicitForall.hs:8:7: error:
• Couldn't match type ‘_a’ with ‘Bool’
‘_a’ is a rigid type variable bound by
the type signature for:
foo :: forall _a. _a -> _a
at NamedWildcardExplicitForall.hs:7:1-27
Expected type: _a -> _a
Actual type: Bool -> Bool
• In the expression: not
In an equation for ‘foo’: foo = not
• Relevant bindings include
foo :: _a -> _a (bound at NamedWildcardExplicitForall.hs:8:1)
NamedWildcardExplicitForall.hs:10:8: error:
• Found type wildcard ‘_a’ standing for ‘Bool’
To use the inferred type, enable PartialTypeSignatures
• In the type signature: bar :: _a -> _a
NamedWildcardExplicitForall.hs:13:26: error:
• Found type wildcard ‘_b’ standing for ‘Bool’
To use the inferred type, enable PartialTypeSignatures
• In the type signature: baz :: forall _a. _a -> _b -> (_a, _b)
NamedWildcardExplicitForall.hs:14:16: error:
• Couldn't match expected type ‘Bool’ with actual type ‘_a’
‘_a’ is a rigid type variable bound by
the inferred type of baz :: _a -> Bool -> (_a, Bool)
at NamedWildcardExplicitForall.hs:13:15-16
• In the first argument of ‘not’, namely ‘x’
In the expression: not x
In the expression: (not x, not y)
• Relevant bindings include
x :: _a (bound at NamedWildcardExplicitForall.hs:14:5)
baz :: _a -> Bool -> (_a, Bool)
(bound at NamedWildcardExplicitForall.hs:14:1)
NamedWildcardExplicitForall.hs:16:8: error:
• Found type wildcard ‘_a’ standing for ‘Bool’
To use the inferred type, enable PartialTypeSignatures
• In the type signature: qux :: _a -> (forall _a. _a -> _a) -> _a
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