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T19615.hs:17:21: error: [GHC-55287]
• The argument ‘(f x)’ of ‘lift'’
does not have a fixed runtime representation.
Its type is:
a0 :: TYPE r0
Cannot unify ‘r'’ with the type variable ‘r0’
because it is not a concrete ‘RuntimeRep’.
• In the first argument of ‘lift'’, namely ‘(f x)’
In the expression: lift' (f x) id
In an equation for ‘mapF’: mapF f x = lift' (f x) id
• Relevant bindings include
f :: a -> b (bound at T19615.hs:17:8)
mapF :: (a -> b) -> Lev a -> Lev b (bound at T19615.hs:17:3)
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