in loader/lib/Parser.js [241:259]
function evalSeries() {
var i = 0, /* Iterator */
sym, /* The current element */
r = null, /* Result of evaluating sym */
s = 0, /* Number of succesful evaluations */
strict_sym, /* Strictness of sym */
node = new Node(this);
do {
sym = this.members[i];
strict_sym = sym.isNonTerminal ? sym.strict : true;
node.children[i] = r =
this.parser.evaluate(sym, (this.strict && strict_sym && (s > 0) ));
if(r !== null) { s += 1; } // Enable strictness
i += 1;
} while(i < this.members.length && (! (r === null && strict_sym)));
return (s == 0 ? null : node);
}