Method arguments are getting reassigned in xtend code

[abies]

public class Test {
    public void m(int arg) {
        arg = 5;
        System.out.println(arg);
    }
}

generates

class Test {
  def m(  int arg){
    arg=5
    println(arg)
  }
}

which fails at assignment of 5 to arg. Solution would be to create artificial variable at the very start of method, rename method arg to _arg and then use variable later in the method (of course, only if this is needed, too much visual noise otherwise)