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gadt7.hs:16:38:
Couldn't match expected type ‘t’ with actual type ‘t1’
‘t1’ is untouchable
inside the constraints (t2 ~ Int)
bound by a pattern with constructor
K :: T Int,
in a case alternative
at gadt7.hs:16:33
‘t1’ is a rigid type variable bound by
the inferred type of i1b :: T t2 -> t1 -> t at gadt7.hs:16:1
‘t’ is a rigid type variable bound by
the inferred type of i1b :: T t2 -> t1 -> t at gadt7.hs:16:1
Relevant bindings include
y1 :: t1 (bound at gadt7.hs:16:16)
y :: t1 (bound at gadt7.hs:16:7)
i1b :: T t2 -> t1 -> t (bound at gadt7.hs:16:1)
In the expression: y1
In a case alternative: K -> y1
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