anchor.diff:  }
   
   @reflectiveTest
  -class BinaryExpressionResolutionTest extends PubPackageResolutionTest {
  +class BinaryExpressionResolutionTest extends PubPackageResolutionTest
  +    with BinaryExpressionResolutionTestCases {}
  +
  +mixin BinaryExpressionResolutionTestCases on PubPackageResolutionTest {
     test_bangEq() async {
       await assertNoErrorsInCode(r'''
   f(int a, int b) {
  
positive.code: 
  @reflectiveTest
  class BinaryExpressionResolutionWithNullSafetyTest
      extends PubPackageResolutionTest with WithNullSafetyMixin {
    test_ifNull_left_nullableContext() async {
      await assertNoErrorsInCode(r'''
  T f<T>(T t) => t;
  
negative.code:   }
  
    test_ifNull() async {
      var question = typeToStringWithNullability ? '?' : '';
      await assertNoErrorsInCode('''
  f(int$question a, double b) {
    a ?? b;
  }
  ''');
  