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T5853.hs:15:52:
Could not deduce (Subst (Subst fa a) b ~ Subst fa b)
from the context (F fa,
Elem (Subst fa b) ~ b,
Subst (Subst fa b) (Elem fa) ~ fa,
F (Subst fa a),
Elem (Subst fa a) ~ a,
Subst (Subst fa a) (Elem fa) ~ fa)
bound by the RULE "map/map" at T5853.hs:15:2-57
NB: ‛Subst’ is a type function, and may not be injective
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)
In the expression: (f . g) <$> xs
When checking the transformation rule "map/map"
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