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T3330a.hs:19:34:
Couldn't match type `s' with `(->) (s0 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:18:13
Expected type: (s0 ix0 -> ix1) -> r ix1 -> Writer [AnyF s] (r ix1)
Actual type: s ix
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)
T3330a.hs:19:36:
Couldn't match type `ix' with `r ix0 -> Writer [AnyF s0] (r ix0)'
`ix' is a rigid type variable bound by
the type signature for children :: s ix -> PF s r ix -> [AnyF s]
at T3330a.hs:18:15
Expected type: s0 ix0 -> ix
Actual type: s0 ix0 -> r ix0 -> Writer [AnyF s0] (r ix0)
In the second argument of `hmapM', namely `collect'
In the first argument of `execWriter', namely `(hmapM p collect x)'
In the expression: execWriter (hmapM p collect x)
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