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T3330a.hs:19:34: error:
• Couldn't match type ‘ix’
with ‘r ix1 -> Writer [AnyF s] (r'0 ix1)’
‘ix’ is a rigid type variable bound by
the type signature for:
children :: forall (s :: * -> *) ix (r :: * -> *).
s ix -> PF s r ix -> [AnyF s]
at T3330a.hs:18:1-43
Expected type: (s0 ix0 -> ix1)
-> r ix1 -> Writer [AnyF s] (r'0 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)
• Relevant bindings include
x :: PF s r ix (bound at T3330a.hs:19:12)
p :: s ix (bound at T3330a.hs:19:10)
children :: s ix -> PF s r ix -> [AnyF s] (bound at T3330a.hs:19:1)
T3330a.hs:19:44: error:
• Couldn't match type ‘ix’
with ‘r0 ix0 -> Writer [AnyF s0] (r0 ix0)’
‘ix’ is a rigid type variable bound by
the type signature for:
children :: forall (s :: * -> *) ix (r :: * -> *).
s ix -> PF s r ix -> [AnyF s]
at T3330a.hs:18:1-43
Expected type: PF s r (r0 ix0 -> Writer [AnyF s0] (r0 ix0))
Actual type: PF s r ix
• In the third argument of ‘hmapM’, namely ‘x’
In the first argument of ‘execWriter’, namely ‘(hmapM p collect x)’
In the expression: execWriter (hmapM p collect x)
• Relevant bindings include
x :: PF s r ix (bound at T3330a.hs:19:12)
p :: s ix (bound at T3330a.hs:19:10)
children :: s ix -> PF s r ix -> [AnyF s] (bound at T3330a.hs:19:1)
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