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T5853.hs:15:46: error:
• Could not deduce: Subst (Subst fa a) b ~ Subst fa b
arising from a use of ‘<$>’
from the context: (F fa, Elem (Subst fa b) ~ b,
Subst fa b ~ Subst fa b, Subst (Subst fa b) (Elem fa) ~ fa,
F (Subst fa a), Elem (Subst fa a) ~ a, Elem fa ~ Elem fa,
Subst (Subst fa a) (Elem fa) ~ fa, Subst fa a ~ Subst fa a)
bound by the RULE "map/map" at T5853.hs:15:2-57
NB: ‘Subst’ is a non-injective type family
• In the expression: (f . g) <$> xs
When checking the transformation rule "map/map"
• Relevant bindings include
f :: Elem fa -> b (bound at T5853.hs:15:19)
g :: a -> Elem fa (bound at T5853.hs:15:21)
xs :: Subst fa a (bound at T5853.hs:15:23)
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