anchor.diff:  // Check an instance method colliding with an instance setter.
   extension E10 on int {
     int method() => 0;
  +  //  ^
  +  // [cfe] Conflicts with setter 'method'.
     void set method(int value) {}
     //       ^^^^^^
     // [analyzer] COMPILE_TIME_ERROR.DUPLICATE_DEFINITION
  -  // [cfe] unspecified
  +  // [cfe] Conflicts with member 'method'.
   }
   
   // Check a static method colliding with an instance getter.
  
positive.code:   static int method() => 0;
    //         ^^^^^^
    // [analyzer] COMPILE_TIME_ERROR.EXTENSION_CONFLICTING_STATIC_AND_INSTANCE
    // [cfe] unspecified
    void set method(int value) {}
  }
  
  // Check an instance method colliding with a static getter.
  
negative.code:   //       ^
    // [cfe] 'property' is already declared in this scope.
    void set property2(int value) {}
    //       ^
    // [cfe] Conflicts with member 'property2'.
    int get property3 => 1;
    //      ^
    // [cfe] Conflicts with setter 'property3'.
    void set field(int value) {}
    //       ^
    // [cfe] Conflicts with member 'field'.
  