third_party/closure/goog/labs/format/csv.js
function pushBack(t) {
    goog.labs.format.csv.assertToken_(t);
    goog.asserts.assert(goog.isNull(pushBackToken));
    pushBackToken = t;
  }
function pushBack(t) {
    goog.labs.format.csv.assertToken_(t);
    goog.asserts.assert(goog.isNull(pushBackToken));
    pushBackToken = t;
  }
function pushBack ( t ) { goog . labs . format . csv . assertToken_ ( t ) ; goog . asserts . assert ( goog . isNull ( pushBackToken ) ) ; pushBackToken = t ; }
Special case for terminal comma. 
Push a single token into the push-back variable.
@param {goog.labs.format.csv.Token} t Single token.
Special case for terminal comma . Push a single token into the push - back variable .