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T3330a.hs:17:34:
Couldn't match type `s' with `(->) (s ix1 -> ix1)'
`s' is a rigid type variable bound by
the type signature for children :: s ix -> PF s r ix -> [AnyF s]
at T3330a.hs:17:1
In the first argument of `hmapM', namely `p'
In the first argument of `execWriter', namely `(hmapM p collect x)'
In the expression: execWriter (hmapM p collect x)
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