anchor.diff:  //                                                                ^^
   // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
   //                                                              ^
  -// [cfe] Operand of null-aware operation '?.' has type 'C' which excludes null
  +// [cfe] Operand of null-aware operation '?.' has type 'C' which excludes null.
   
     var actual17 = c4 ?.. test2();
   //                  ^^^
   // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
   //               ^
  -// [cfe] Operand of null-aware operation '?..' has type 'C' which excludes null
  +// [cfe] Operand of null-aware operation '?..' has type 'C' which excludes null.
   
     Expect.equals(expected4, actual17);
     Expect.equals("test1 called 1 times, test2() called 1 times", c4?.log);
   //                                                                ^^
   // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
   //                                                              ^
  -// [cfe] Operand of null-aware operation '?.' has type 'C' which excludes null
  +// [cfe] Operand of null-aware operation '?.' has type 'C' which excludes null.
   
     var actual18 = c4
   //               ^
  -// [cfe] Operand of null-aware operation '?..' has type 'C' which excludes null
  +// [cfe] Operand of null-aware operation '?..' has type 'C' which excludes null.
         ?.. test1
   //    ^^^
   // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
  
positive.code: //                 ^^^
  // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
  //              ^
  // [cfe] Operand of null-aware operation '?..' has type 'C' which excludes null
  
    Expect.equals(expected, actual2);
    Expect.equals("test1 called 1 times, test2() called 1 times", c1.log);
  
    var actual3 = c1
  //              ^
  // [cfe] Operand of null-aware operation '?..' has type 'C' which excludes null
      ?.. test1
  //  ^^^
  // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
  
negative.code: //                                                                ^^
  // [analyzer] STATIC_WARNING.INVALID_NULL_AWARE_OPERATOR
  //                                                              ^
  // [cfe] Operand of null-aware operation '?.' has type 'C' which excludes null.
  }
  