nonvar/1

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Predicate nonvar/1

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Availability:built-in

[ISO]nonvar(@Term)

True if Term currently is not a free variable. This is the logical complement of var/1: var(X) is true iff nonvar(X) fails.

History

Fixed in 10.1.19 (👉27c742f) with optimise, var/1 and nonvar/1 on a fresh variable did not mark the variable as initialised. As 7dba157ea, this could leave the variable uninitialised after \+ inside a branch of ;/2.