@awelonblue @raganwald you sure? Cause I remember reading in original paper that it makes copies of S-structures when changing them.
@Swizec @raganwald lisp in the original McCarthy's paper was immutable, @awelonblue is refering to constructs in Common Lisp.
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@sbelak@Swizec@raganwald@awelonblue The real implementation Lisp 1.5 from 1962 had SET, SETQ, ARRAY, DEFINE, RPLACA, RPLACD and more...Thanks. Twitter will use this to make your timeline better. UndoUndo
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