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
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
tc211.hs:15:22:
Couldn't match type ‛forall a6. a6 -> a6’ with ‛a -> a’
Expected type: [a -> a]
Actual type: [forall a. a -> a]
In the first argument of ‛head’, namely ‛foo’
In the first argument of ‛(:) ::
(forall a. a -> a)
-> [forall a. a -> a] -> [forall a. a -> a]’, namely
‛(head foo)’
In the expression:
((:) ::
(forall a. a -> a) -> [forall a. a -> a] -> [forall a. a -> a])
(head foo) foo
tc211.hs:48:19:
Could not deduce (Num a2) arising from the literal ‛3’
from the context (Num a)
bound by the inferred type of
h1 :: Num a => (forall a1. a1 -> a1) -> a
at tc211.hs:(47,1)-(49,9)
The type variable ‛a2’ is ambiguous
Relevant bindings include
y :: Pair a2 (Pair a3 b1) (bound at tc211.hs:48:10)
Note: there are several potential instances:
instance Num Double -- Defined in ‛GHC.Float’
instance Num Float -- Defined in ‛GHC.Float’
instance Integral a => Num (GHC.Real.Ratio a)
-- Defined in ‛GHC.Real’
...plus three others
In the first argument of ‛g’, namely ‛3’
In the first argument of ‛P’, namely ‛(g 3)’
In the expression: P (g 3) (g (P 3 4))
tc211.hs:48:28:
Could not deduce (Num a3) arising from the literal ‛3’
from the context (Num a)
bound by the inferred type of
h1 :: Num a => (forall a1. a1 -> a1) -> a
at tc211.hs:(47,1)-(49,9)
The type variable ‛a3’ is ambiguous
Relevant bindings include
y :: Pair a2 (Pair a3 b1) (bound at tc211.hs:48:10)
Note: there are several potential instances:
instance Num Double -- Defined in ‛GHC.Float’
instance Num Float -- Defined in ‛GHC.Float’
instance Integral a => Num (GHC.Real.Ratio a)
-- Defined in ‛GHC.Real’
...plus three others
In the first argument of ‛P’, namely ‛3’
In the first argument of ‛g’, namely ‛(P 3 4)’
In the second argument of ‛P’, namely ‛(g (P 3 4))’
tc211.hs:48:30:
Could not deduce (Num b1) arising from the literal ‛4’
from the context (Num a)
bound by the inferred type of
h1 :: Num a => (forall a1. a1 -> a1) -> a
at tc211.hs:(47,1)-(49,9)
The type variable ‛b1’ is ambiguous
Relevant bindings include
y :: Pair a2 (Pair a3 b1) (bound at tc211.hs:48:10)
Note: there are several potential instances:
instance Num Double -- Defined in ‛GHC.Float’
instance Num Float -- Defined in ‛GHC.Float’
instance Integral a => Num (GHC.Real.Ratio a)
-- Defined in ‛GHC.Real’
...plus three others
In the second argument of ‛P’, namely ‛4’
In the first argument of ‛g’, namely ‛(P 3 4)’
In the second argument of ‛P’, namely ‛(g (P 3 4))’
tc211.hs:70:9:
Couldn't match type ‛forall a7. a7 -> a7’ with ‛a6 -> a6’
Expected type: List (forall a. a -> a)
-> (forall a. a -> a) -> a6 -> a6
Actual type: List (forall a. a -> a)
-> (forall a. a -> a) -> forall a. a -> a
In the expression:
foo2 ::
List (forall a. a -> a) -> (forall a. a -> a) -> (forall a. a -> a)
In the expression:
(foo2 ::
List (forall a. a -> a)
-> (forall a. a -> a) -> (forall a. a -> a))
xs1 (\ x -> x)
In an equation for ‛bar4’:
bar4
= (foo2 ::
List (forall a. a -> a)
-> (forall a. a -> a) -> (forall a. a -> a))
xs1 (\ x -> x)
|
