member_chain/2

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Predicate member_chain/2

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Source

member_chain(?Element, +Chain)

Enumerate the elements of a chain on backtracking. The elements come from a snapshot of the chain taken at the first call: changes to the chain do not affect the enumeration, but elements that are freed before they are reached are skipped. This is safe if other threads use or modify the chain. Fails if Chain is @nil.