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T7438.hs:6:14: error:
• Couldn't match expected type ‘t’ with actual type ‘t1’
‘t’ is untouchable
inside the constraints: b ~ a
bound by a pattern with constructor:
Nil :: forall k (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 a b -> t1 -> t at T7438.hs:6:1-16
‘t1’ is a rigid type variable bound by
the inferred type of go :: Thrist a b -> t1 -> t at T7438.hs:6:1-16
Possible fix: add a type signature for ‘go’
• In the expression: acc
In an equation for ‘go’: go Nil acc = acc
• Relevant bindings include
acc :: t1 (bound at T7438.hs:6:8)
go :: Thrist a b -> t1 -> t (bound at T7438.hs:6:1)
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