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T7438.hs:6:14: error:
• Could not deduce (p ~ p1)
from the context: 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
‘p’ is a rigid type variable bound by
the inferred type of go :: Thrist a b -> p -> p1
at T7438.hs:6:1-16
‘p1’ is a rigid type variable bound by
the inferred type of go :: Thrist a b -> p -> p1
at T7438.hs:6:1-16
• In the expression: acc
In an equation for ‘go’: go Nil acc = acc
• Relevant bindings include
acc :: p (bound at T7438.hs:6:8)
go :: Thrist a b -> p -> p1 (bound at T7438.hs:6:1)
Suggested fix: Consider giving ‘go’ a type signature
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