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T14172.hs:7:46: error: [GHC-88464]
• Found type wildcard ‘_’ standing for ‘a'’
Where: ‘a'’ is a rigid type variable bound by
the inferred type of
traverseCompose :: (a -> f b) -> g a -> f (h a')
at T14172.hs:8:1-46
To use the inferred type, enable PartialTypeSignatures
• In the first argument of ‘h’, namely ‘_’
In the first argument of ‘f’, namely ‘(h _)’
In the type signature:
traverseCompose :: (a -> f b) -> g a -> f (h _)
T14172.hs:8:19: error: [GHC-25897]
• Couldn't match type ‘h’ with ‘Compose f'0 g'0’
arising from a use of ‘_Wrapping’
‘h’ is a rigid type variable bound by
the inferred type of
traverseCompose :: (a -> f b) -> g a -> f (h a')
at T14172.hs:7:1-47
• In the first argument of ‘(.)’, namely ‘_Wrapping Compose’
In the expression: _Wrapping Compose . traverse
In an equation for ‘traverseCompose’:
traverseCompose = _Wrapping Compose . traverse
• Relevant bindings include
traverseCompose :: (a -> f b) -> g a -> f (h a')
(bound at T14172.hs:8:1)
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