(dolist (i '(1 2 3) (foo i)) (foo i))
expands to
(function () {
for (var i = null, _js_arrvar58 = [1, 2, 3], _js_idx57 = 0;
_js_idx57 < _js_arrvar58.length; _js_idx57 += 1) {
i = _js_arrvar58[_js_idx57];
foo(i);
};
return foo(i);
})();
Since JavaScript variables have at least function scope, this
effectively evaluates to foo(3), excluding side effects.
On the other hand, CLHS entry for DOLIST (§6.2) contains the following clause:
dolist (var list-form [result-form]) declaration* {tag | statement}*
...
At the time RESULT-FORM is processed, VAR is bound to NIL.
Given this project's goal, stated by Vladimir in a recent message, of
bringing PS semantically as close as possible to Lisp, this
discrepancy is rather unfortunate, so please find attached a patch to
remove it.
— B. Smilga.
0001-Set-iteration-var-to-null-when-evaluating-result-of-dolist.patch
Description: Binary data
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