code: RBBINode pushNewNode(int nodeType) {
          fNodeStackPtr++;
          if (fNodeStackPtr >= kStackSize) {
              System.out.println("RBBIRuleScanner.pushNewNode - stack overflow.");
              error(RBBIRuleBuilder.U_BRK_INTERNAL_ERROR);
          }
          fNodeStack[fNodeStackPtr] = new RBBINode(nodeType);
          return fNodeStack[fNodeStackPtr];
      }
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