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T2414.hs:9:13: error:
• Occurs check: cannot construct the infinite type: b0 ~ (Bool, b0)
Expected type: b0 -> Maybe (Bool, b0)
Actual type: (Bool, b0) -> Maybe (Bool, b0)
• In the first argument of ‘unfoldr’, namely ‘Just’
In the expression: unfoldr Just
In an equation for ‘f’: f = unfoldr Just
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