static int js_delvar(js_State *J, const char *name)
{
	js_Environment *E = J->E;
	do {
		js_Property *ref = jsV_getownproperty(J, E->variables, name);
		if (ref) {
			if (ref->atts & JS_DONTCONF) {
				if (J->strict)
					js_typeerror(J, "'%s' is non-configurable", name);
				return 0;
			}
			jsV_delproperty(J, E->variables, name);
			return 1;
		}
		E = E->outer;
	} while (E);
	return jsR_delproperty(J, J->G, name);
}
Unknown