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T3208b.hs:15:15: error:
• Could not deduce (OTerm o0 ~ STerm a)
arising from a use of ‘apply’
from the context: (OTerm a ~ STerm a, OBJECT a, SUBST a)
bound by the type signature for:
fce' :: forall a c.
(OTerm a ~ STerm a, OBJECT a, SUBST a) =>
a -> c
at T3208b.hs:14:1-56
The type variable ‘o0’ is ambiguous
• In the first argument of ‘fce’, namely ‘(apply f)’
In the expression: fce (apply f)
In an equation for ‘fce'’: fce' f = fce (apply f)
• Relevant bindings include
f :: a (bound at T3208b.hs:15:6)
fce' :: a -> c (bound at T3208b.hs:15:1)
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