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PolytypeDecomp.hs:30:17: error: [GHC-91028]
• Couldn't match type ‘a0’ with ‘[forall a. Maybe a]’
Expected: Id a0
Actual: [forall a. Maybe a]
Cannot instantiate unification variable ‘a0’
with a type involving polytypes: [forall a. Maybe a]
• In the expression: x
In the first argument of ‘myLength’, namely ‘[x, f]’
In the expression: myLength [x, f]
PolytypeDecomp.hs:30:19: error: [GHC-91028]
• Couldn't match type ‘a0’ with ‘[forall a. Maybe a]’
Expected: Id a0
Actual: [forall a. F [a]]
Cannot instantiate unification variable ‘a0’
with a type involving polytypes: [forall a. Maybe a]
• In the expression: f
In the first argument of ‘myLength’, namely ‘[x, f]’
In the expression: myLength [x, f]
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