blob: d75a630d0417097c547d9b9fae54278e2e208a36 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
WildcardsInPatternAndExprSig.hs:4:18: error:
• Found type wildcard ‘_a’ standing for ‘_’
Where: ‘_’ is a rigid type variable bound by
the inferred type of bar :: Maybe [_] -> _ -> [_]
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 [_] -> _ -> [_]
(bound at WildcardsInPatternAndExprSig.hs:4:1)
WildcardsInPatternAndExprSig.hs:4:25: error:
• Found type wildcard ‘_’ standing for ‘[_]’
Where: ‘_’ is a rigid type variable bound by
the inferred type of bar :: Maybe [_] -> _ -> [_]
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 [_] -> _ -> [_]
(bound at WildcardsInPatternAndExprSig.hs:4:1)
WildcardsInPatternAndExprSig.hs:4:38: error:
• Found type wildcard ‘_b’ standing for ‘_’
Where: ‘_’ is a rigid type variable bound by
the inferred type of bar :: Maybe [_] -> _ -> [_]
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 [_] -> _ -> [_]
(bound at WildcardsInPatternAndExprSig.hs:4:1)
WildcardsInPatternAndExprSig.hs:4:49: error:
• Found type wildcard ‘_c’ standing for ‘_’
Where: ‘_’ is a rigid type variable bound by
the inferred type of bar :: Maybe [_] -> _ -> [_]
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 :: _ (bound at WildcardsInPatternAndExprSig.hs:4:13)
bar :: Maybe [_] -> _ -> [_]
(bound at WildcardsInPatternAndExprSig.hs:4:1)
WildcardsInPatternAndExprSig.hs:4:66: error:
• Found type wildcard ‘_d’ standing for ‘_’
Where: ‘_’ is a rigid type variable bound by
the inferred type of bar :: Maybe [_] -> _ -> [_]
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 :: _ (bound at WildcardsInPatternAndExprSig.hs:4:44)
x :: _ (bound at WildcardsInPatternAndExprSig.hs:4:13)
bar :: Maybe [_] -> _ -> [_]
(bound at WildcardsInPatternAndExprSig.hs:4:1)
|
