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T7453.hs:10:30:
Couldn't match expected type ‘t1’ with actual type ‘t’
because type variable ‘t1’ would escape its scope
This (rigid, skolem) type variable is bound by
the type signature for z :: Id t1
at T7453.hs:8:16-19
Relevant bindings include
aux :: Id t1 (bound at T7453.hs:10:21)
z :: Id t1 (bound at T7453.hs:9:11)
v :: t (bound at T7453.hs:7:7)
cast1 :: t -> a (bound at T7453.hs:7:1)
In the first argument of ‘Id’, namely ‘v’
In the expression: Id v
T7453.hs:16:33:
Couldn't match expected type ‘t2’ with actual type ‘t’
because type variable ‘t2’ would escape its scope
This (rigid, skolem) type variable is bound by
the type signature for z :: () -> t2
at T7453.hs:14:16-22
Relevant bindings include
aux :: b -> t2 (bound at T7453.hs:16:21)
z :: () -> t2 (bound at T7453.hs:15:11)
v :: t (bound at T7453.hs:13:7)
cast2 :: t -> t1 (bound at T7453.hs:13:1)
In the first argument of ‘const’, namely ‘v’
In the expression: const v
T7453.hs:21:15:
Couldn't match expected type ‘t1’ with actual type ‘a’
because type variable ‘t1’ would escape its scope
This (rigid, skolem) type variable is bound by
the type signature for z :: t1
at T7453.hs:20:16
Relevant bindings include
aux :: forall b. b -> a (bound at T7453.hs:22:21)
z :: t1 (bound at T7453.hs:21:11)
v :: a (bound at T7453.hs:19:7)
cast3 :: a -> t (bound at T7453.hs:19:1)
In the expression: v
In an equation for ‘z’:
z = v
where
aux = const v
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