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T21338.hs:38:24:
Couldn't match type ‘flds0’ with ‘flds’
Expected: NP (K String) flds
Actual: NP (K String) flds0
‘flds0’ is untouchable
inside the constraints: All flds0
bound by a pattern with constructor:
Record :: forall (xs :: [*]).
All xs =>
NP (K String) xs -> ConstructorInfo xs,
in a case alternative
at T21338.hs:38:3-11
‘flds’ is a rigid type variable bound by
the type signature for:
fieldNames :: forall a (flds :: [*]). NP (K String) flds
at T21338.hs:36:1-57
In the second argument of ‘hmap’, namely ‘np’
In the expression: hmap id np
In a case alternative: Record np -> hmap id np
Relevant bindings include
np :: NP (K String) flds0 (bound at T21338.hs:38:10)
fieldNames :: NP (K String) flds (bound at T21338.hs:37:1)
T21338.hs:39:8:
Cannot apply expression of type ‘h0 f0 xs0 -> h0 g0 xs0’
to a visible type argument ‘flds’
In the expression: hmap undefined @flds
In a case alternative: _ -> hmap undefined @flds
In the expression:
case foo @a of
Record np -> hmap id np
_ -> hmap undefined @flds
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