174     aChunk.forEach(function (chunk) {  argument
175       this.add(chunk);
222   var chunk;
224     chunk = this.children[i];
225     if (chunk[isSourceNode]) {
226       chunk.walk(aFn);
229       if (chunk !== '') {
230         aFn(chunk, { source: this.source,
320   this.walk(function (chunk) {  argument
321     str += chunk;
342   this.walk(function (chunk, original) {  argument
343     generated.code += chunk;
379     for (var idx = 0, length = chunk.length; idx < length; idx++) {
380       if (chunk.charCodeAt(idx) === NEWLINE_CODE) {