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 void set field2(int value) {}
    //              ^^^^^^
    // [analyzer] COMPILE_TIME_ERROR.DUPLICATE_DEFINITION
    // [cfe] unspecified
  }
  
  // Check instance members colliding with instance members (of the same kind).
  
negative.code:   static int get property2 => 1;
    //             ^^^^^^^^^
    // [analyzer] COMPILE_TIME_ERROR.EXTENSION_CONFLICTING_STATIC_AND_INSTANCE
    // [cfe] Conflicts with setter 'property2'.
    static void set property3(int x) {}
    //              ^^^^^^^^^
    // [analyzer] COMPILE_TIME_ERROR.EXTENSION_CONFLICTING_STATIC_AND_INSTANCE
    // [cfe] Conflicts with member 'property3'.
    static int field = 3;
    //         ^^^^^
    // [analyzer] COMPILE_TIME_ERROR.EXTENSION_CONFLICTING_STATIC_AND_INSTANCE
  