//
// Operator-Assignment expressions
public JCExpression transform(final Tree.ArithmeticAssignmentOp op){
final AssignmentOperatorTranslation operator = Operators.getAssignmentOperator(op.getClass());
if(operator == null){
return makeErroneous(op, "compiler bug: "+op.getNodeType() + " is not a supported arithmetic assignment operator");
}
// see if we can optimise it