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T7438.hs:6:14:
Couldn't match expected type ‘t1’ with actual type ‘t’
‘t’ is untouchable
inside the constraints (t2 ~ t3)
bound by a pattern with constructor
Nil :: forall (a :: k). Thrist a a,
in an equation for ‘go’
at T7438.hs:6:4-6
‘t’ is a rigid type variable bound by
the inferred type of go :: Thrist t2 t3 -> t -> t1 at T7438.hs:6:1
‘t1’ is a rigid type variable bound by
the inferred type of go :: Thrist t2 t3 -> t -> t1 at T7438.hs:6:1
Relevant bindings include
acc :: t (bound at T7438.hs:6:8)
go :: Thrist t2 t3 -> t -> t1 (bound at T7438.hs:6:1)
In the expression: acc
In an equation for ‘go’: go Nil acc = acc
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