Scieneer Common Lisp 1.3.9 online documentation kernel:rplacd-conditional cons old new [Function] Atomically compare the cdr cell of cons to old and if eq then store new in the cell. The original cell value is returned.
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| kernel:rplacd-conditional cons old new | [Function] |
Atomically compare the cdr cell of cons to old and if eq then store new in the cell. The original cell value is returned.