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gadt7.hs:16:38: error:
• Couldn't match expected type ‘r’ with actual type ‘r1’
‘r’ is untouchable
inside the constraints: t ~ Int
bound by a pattern with constructor: K :: T Int,
in a case alternative
at gadt7.hs:16:33
‘r’ is a rigid type variable bound by
the inferred type of i1b :: T t -> r1 -> r at gadt7.hs:16:1
‘r1’ is a rigid type variable bound by
the inferred type of i1b :: T t -> r1 -> r at gadt7.hs:16:1
Possible fix: add a type signature for ‘i1b’
• In the expression: y1
In a case alternative: K -> y1
In the expression: case t1 of { K -> y1 }
• Relevant bindings include
y1 :: r1 (bound at gadt7.hs:16:16)
y :: r1 (bound at gadt7.hs:16:7)
i1b :: T t -> r1 -> r (bound at gadt7.hs:16:1)
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