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GADTwrong1.hs:12:19:
Could not deduce (a1 ~ b)
from the context (() ~ Const a1)
bound by a pattern with constructor
T :: forall a. a -> T (Const a),
in a case alternative
at GADTwrong1.hs:12:12-14
‘a1’ is a rigid type variable bound by
a pattern with constructor
T :: forall a. a -> T (Const a),
in a case alternative
at GADTwrong1.hs:12:12
‘b’ is a rigid type variable bound by
the type signature for coerce :: a -> b at GADTwrong1.hs:10:20
Relevant bindings include
y :: a1 (bound at GADTwrong1.hs:12:14)
coerce :: a -> b (bound at GADTwrong1.hs:11:1)
In the expression: y
In a case alternative: T y -> y
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