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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)