cl-nsubst

cl-nsubst is an autoloaded compiled Lisp function in `cl-seq.el'.

(cl-nsubst NEW OLD TREE [KEYWORD VALUE]...)

Substitute NEW for OLD everywhere in TREE (destructively).
Any element of TREE which is `eql' to OLD is changed to NEW (via a call
to `setcar').

Keywords supported: :test :test-not :key