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WildcardsInPatternAndExprSig.hs:4:18: error:
• Found type wildcard ‘_a’ standing for ‘w’
Where: ‘w’ is a rigid type variable bound by
the inferred type of bar :: Maybe [w] -> w -> [w]
at WildcardsInPatternAndExprSig.hs:4:1-68
To use the inferred type, enable PartialTypeSignatures
• In a pattern type signature: _a
In the pattern: x :: _a
In the pattern: [x :: _a]
• Relevant bindings include
bar :: Maybe [w] -> w -> [w]
(bound at WildcardsInPatternAndExprSig.hs:4:1)
WildcardsInPatternAndExprSig.hs:4:25: error:
• Found type wildcard ‘_’ standing for ‘[w]’
Where: ‘w’ is a rigid type variable bound by
the inferred type of bar :: Maybe [w] -> w -> [w]
at WildcardsInPatternAndExprSig.hs:4:1-68
To use the inferred type, enable PartialTypeSignatures
• In a pattern type signature: _
In the pattern: [x :: _a] :: _
In the pattern: Just ([x :: _a] :: _)
• Relevant bindings include
bar :: Maybe [w] -> w -> [w]
(bound at WildcardsInPatternAndExprSig.hs:4:1)
WildcardsInPatternAndExprSig.hs:4:38: error:
• Found type wildcard ‘_b’ standing for ‘w’
Where: ‘w’ is a rigid type variable bound by
the inferred type of bar :: Maybe [w] -> w -> [w]
at WildcardsInPatternAndExprSig.hs:4:1-68
To use the inferred type, enable PartialTypeSignatures
• In a pattern type signature: Maybe [_b]
In the pattern: Just ([x :: _a] :: _) :: Maybe [_b]
In an equation for ‘bar’:
bar (Just ([x :: _a] :: _) :: Maybe [_b]) (z :: _c)
= [x, z] :: [_d]
• Relevant bindings include
bar :: Maybe [w] -> w -> [w]
(bound at WildcardsInPatternAndExprSig.hs:4:1)
WildcardsInPatternAndExprSig.hs:4:49: error:
• Found type wildcard ‘_c’ standing for ‘w’
Where: ‘w’ is a rigid type variable bound by
the inferred type of bar :: Maybe [w] -> w -> [w]
at WildcardsInPatternAndExprSig.hs:4:1-68
To use the inferred type, enable PartialTypeSignatures
• In a pattern type signature: _c
In the pattern: z :: _c
In an equation for ‘bar’:
bar (Just ([x :: _a] :: _) :: Maybe [_b]) (z :: _c)
= [x, z] :: [_d]
• Relevant bindings include
x :: w (bound at WildcardsInPatternAndExprSig.hs:4:13)
bar :: Maybe [w] -> w -> [w]
(bound at WildcardsInPatternAndExprSig.hs:4:1)
WildcardsInPatternAndExprSig.hs:4:66: error:
• Found type wildcard ‘_d’ standing for ‘w’
Where: ‘w’ is a rigid type variable bound by
the inferred type of bar :: Maybe [w] -> w -> [w]
at WildcardsInPatternAndExprSig.hs:4:1-68
To use the inferred type, enable PartialTypeSignatures
• In an expression type signature: [_d]
In the expression: [x, z] :: [_d]
In an equation for ‘bar’:
bar (Just ([x :: _a] :: _) :: Maybe [_b]) (z :: _c)
= [x, z] :: [_d]
• Relevant bindings include
z :: w (bound at WildcardsInPatternAndExprSig.hs:4:44)
x :: w (bound at WildcardsInPatternAndExprSig.hs:4:13)
bar :: Maybe [w] -> w -> [w]
(bound at WildcardsInPatternAndExprSig.hs:4:1)
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