private void writeSimpleBinaryExpression(PsiElement opToken, GrExpression left, GrExpression right) {
    left.accept(this);
    builder.append(' ');
    builder.append(opToken.getText());
    if (right != null) {
      builder.append(' ');
      right.accept(this);
    }
  }
private void writeSimpleBinaryExpression(PsiElement opToken, GrExpression left, GrExpression right)