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T5853.hs:15:52: error: [GHC-25897]
• Could not deduce ‘Subst fa2 (Elem fb) ~ fb’
arising from a use of ‘<$>’
from the context: (F fa1, Elem fb ~ Elem fb,
Subst fa1 (Elem fb) ~ fb, Subst fb (Elem fa1) ~ fa1, F fa2,
Elem fa2 ~ Elem fa2, Elem fa1 ~ Elem fa1,
Subst fa2 (Elem fa1) ~ fa1, Subst fa1 (Elem fa2) ~ fa2)
bound by the RULE "map/map" at T5853.hs:15:2-57
‘fb’ is a rigid type variable bound by
the RULE "map/map"
at T5853.hs:15:2-57
• In the expression: (f . g) <$> xs
When checking the rewrite rule "map/map"
• Relevant bindings include
f :: Elem fa1 -> Elem fb (bound at T5853.hs:15:19)
g :: Elem fa2 -> Elem fa1 (bound at T5853.hs:15:21)
xs :: fa2 (bound at T5853.hs:15:23)
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