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GADTwrong1.hs:12:21: error:
• Couldn't match expected type ‘b’ with actual type ‘c’
‘c’ is a rigid type variable bound by
a pattern with constructor: T :: forall c. c -> T (Const c),
in a case alternative
at GADTwrong1.hs:12:14-16
‘b’ is a rigid type variable bound by
the type signature for:
coerce :: forall a b. a -> b
at GADTwrong1.hs:10:1-29
• In the expression: y
In a case alternative: T y -> y
In the expression: case T x :: T (Const b) of { T y -> y }
• Relevant bindings include
y :: c (bound at GADTwrong1.hs:12:16)
coerce :: a -> b (bound at GADTwrong1.hs:11:1)
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