code: protected boolean isReassignmentOperator(XBinaryOperation operator) {
  		if (operator.isReassignFirstArgument()) {
  			return true;
  		}
  		final QualifiedName operatorName = this.operatorMapping.getOperator(
  				QualifiedName.create(operator.getFeature().getSimpleName()));
  		final QualifiedName compboundOperatorName = this.operatorMapping.getSimpleOperator(operatorName);
  		return compboundOperatorName != null;
  	}
docs: Replies if the given operator is a reassignment operator.
  A reassignment operator changes its left operand.
  
  @param operator the operator.
  @return {@code true} if the operator changes its left operand.