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ExtraConstraintsWildcardNotEnabled.hs:4:10: error:
• Found type wildcard ‘_’ standing for ‘Show a’
Where: ‘a’ is a rigid type variable bound by
the inferred type of show' :: Show a => a -> String
at ExtraConstraintsWildcardNotEnabled.hs:5:1-16
To use the inferred type, enable PartialTypeSignatures
• In the type signature: show' :: _ => a -> String
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