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T4272.hs:15:26: error:
• Occurs check: cannot construct the infinite type:
a ~ TermFamily a a
Expected type: TermFamily a (TermFamily a a)
Actual type: TermFamily a a
• In the first argument of ‘terms’, namely
‘(undefined :: TermFamily a a)’
In the second argument of ‘prune’, namely
‘(terms (undefined :: TermFamily a a))’
In the expression: prune t (terms (undefined :: TermFamily a a))
• Relevant bindings include
t :: TermFamily a a (bound at T4272.hs:15:6)
laws :: TermFamily a a -> b (bound at T4272.hs:15:1)
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