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T7453.hs:10:30: error:
• Couldn't match expected type ‘t’ with actual type ‘p’
‘t’ is a rigid type variable bound by
the type signature for:
z :: forall t. Id t
at T7453.hs:8:11-19
‘p’ is a rigid type variable bound by
the inferred type of cast1 :: p -> a
at T7453.hs:(7,1)-(10,30)
• In the first argument of ‘Id’, namely ‘v’
In the expression: Id v
In an equation for ‘aux’: aux = Id v
• Relevant bindings include
aux :: Id t (bound at T7453.hs:10:21)
z :: Id t (bound at T7453.hs:9:11)
v :: p (bound at T7453.hs:7:7)
cast1 :: p -> a (bound at T7453.hs:7:1)
T7453.hs:16:33: error:
• Couldn't match expected type ‘t1’ with actual type ‘p’
‘t1’ is a rigid type variable bound by
the type signature for:
z :: forall t1. () -> t1
at T7453.hs:14:11-22
‘p’ is a rigid type variable bound by
the inferred type of cast2 :: p -> t
at T7453.hs:(13,1)-(16,33)
• In the first argument of ‘const’, namely ‘v’
In the expression: const v
In an equation for ‘aux’: aux = const v
• Relevant bindings include
aux :: b -> t1 (bound at T7453.hs:16:21)
z :: () -> t1 (bound at T7453.hs:15:11)
v :: p (bound at T7453.hs:13:7)
cast2 :: p -> t (bound at T7453.hs:13:1)
T7453.hs:21:15: error:
• Couldn't match expected type ‘t1’ with actual type ‘p’
‘t1’ is a rigid type variable bound by
the type signature for:
z :: forall t1. t1
at T7453.hs:20:11-16
‘p’ is a rigid type variable bound by
the inferred type of cast3 :: p -> t
at T7453.hs:(19,1)-(22,33)
• In the expression: v
In an equation for ‘z’:
z = v
where
aux = const v
In an equation for ‘cast3’:
cast3 v
= z
where
z :: t
z = v
where
aux = const v
• Relevant bindings include
aux :: forall b. b -> p (bound at T7453.hs:22:21)
z :: t1 (bound at T7453.hs:21:11)
v :: p (bound at T7453.hs:19:7)
cast3 :: p -> t (bound at T7453.hs:19:1)
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