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Simple14.hs:8:8: error:
• Couldn't match type ‘z0’ with ‘z’
‘z0’ is untouchable
inside the constraints: x ~ y
bound by a type expected by the context:
(x ~ y) => EQ_ z0 z0
at Simple14.hs:8:8-39
‘z’ is a rigid type variable bound by
the type signature for:
eqE :: forall x y z p. EQ_ x y -> ((x ~ y) => EQ_ z z) -> p
at Simple14.hs:8:8-39
Expected type: EQ_ z0 z0
Actual type: EQ_ z z
• In the ambiguity check for ‘eqE’
To defer the ambiguity check to use sites, enable AllowAmbiguousTypes
In the type signature: eqE :: EQ_ x y -> (x ~ y => EQ_ z z) -> p
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