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gadt7.hs:16:38: error:
• Could not deduce (p1 ~ p2)
from the context: a ~ Int
bound by a pattern with constructor: K :: T Int,
in a case alternative
at gadt7.hs:16:33
‘p1’ is a rigid type variable bound by
the inferred type of i1b :: T a -> p1 -> p2
at gadt7.hs:16:1-44
‘p2’ is a rigid type variable bound by
the inferred type of i1b :: T a -> p1 -> p2
at gadt7.hs:16:1-44
• In the expression: y1
In a case alternative: K -> y1
In the expression: case t1 of K -> y1
• Relevant bindings include
y1 :: p1 (bound at gadt7.hs:16:16)
y :: p1 (bound at gadt7.hs:16:7)
i1b :: T a -> p1 -> p2 (bound at gadt7.hs:16:1)
Suggested fix: Consider giving ‘i1b’ a type signature
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