anchor.diff:  }
   
   foo1() {}
  +doSomething(e) => e;
   
   int get x => 42;
   set x(value) { }
  
positive.code:   var _x;
    var _y;
  
    C(this.x, y)
      : _y = y,
        super();
  
  
negative.code:       "    // Discard this one.\n"
        "  }");
    expectSource(cm.constructors[const Symbol("C")],
        "C(this._x, y)\n"
        "    : _y = y,\n"
        "      super();");
    expectSource(cm.constructors[const Symbol("C.other")],
  