| library; | 
 | // | 
 | // Problems in library: | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:104:8: Error: Extensions can't declare instance fields | 
 | // Try removing the field declaration or making it a static field | 
 | //   int? extensionInstanceFieldAndSetter; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:107:8: Error: Extensions can't declare instance fields | 
 | // Try removing the field declaration or making it a static field | 
 | //   int? extensionInstanceFieldAndDuplicateSetter; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:111:8: Error: Extensions can't declare instance fields | 
 | // Try removing the field declaration or making it a static field | 
 | //   int? duplicateExtensionInstanceFieldAndSetter1; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:112:14: Error: Extensions can't declare instance fields | 
 | // Try removing the field declaration or making it a static field | 
 | //   final int? duplicateExtensionInstanceFieldAndSetter1 = null; | 
 | //              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:115:14: Error: Extensions can't declare instance fields | 
 | // Try removing the field declaration or making it a static field | 
 | //   final int? duplicateExtensionInstanceFieldAndSetter2 = null; | 
 | //              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:116:8: Error: Extensions can't declare instance fields | 
 | // Try removing the field declaration or making it a static field | 
 | //   int? duplicateExtensionInstanceFieldAndSetter2; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:148:8: Error: Extensions can't declare instance fields | 
 | // Try removing the field declaration or making it a static field | 
 | //   int? extensionInstanceFieldAndStaticSetter; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:151:8: Error: Extensions can't declare instance fields | 
 | // Try removing the field declaration or making it a static field | 
 | //   int? extensionInstanceFieldAndStaticDuplicateSetter; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:155:8: Error: Extensions can't declare instance fields | 
 | // Try removing the field declaration or making it a static field | 
 | //   int? duplicateExtensionInstanceFieldAndStaticSetter1; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:156:14: Error: Extensions can't declare instance fields | 
 | // Try removing the field declaration or making it a static field | 
 | //   final int? duplicateExtensionInstanceFieldAndStaticSetter1 = null; | 
 | //              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:159:14: Error: Extensions can't declare instance fields | 
 | // Try removing the field declaration or making it a static field | 
 | //   final int? duplicateExtensionInstanceFieldAndStaticSetter2 = null; | 
 | //              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:160:8: Error: Extensions can't declare instance fields | 
 | // Try removing the field declaration or making it a static field | 
 | //   int? duplicateExtensionInstanceFieldAndStaticSetter2; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:6:10: Error: Conflicts with the implicit setter of the field 'topLevelFieldAndSetter'. | 
 | // void set topLevelFieldAndSetter(int? value) {} | 
 | //          ^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:5:6: Context: Field 'topLevelFieldAndSetter' with the implicit setter. | 
 | // int? topLevelFieldAndSetter; | 
 | //      ^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:9:10: Error: Conflicts with the implicit setter of the field 'topLevelFieldAndDuplicateSetter'. | 
 | // void set topLevelFieldAndDuplicateSetter(int? value) {} | 
 | //          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:8:6: Context: Field 'topLevelFieldAndDuplicateSetter' with the implicit setter. | 
 | // int? topLevelFieldAndDuplicateSetter; | 
 | //      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:10:10: Error: Conflicts with the implicit setter of the field 'topLevelFieldAndDuplicateSetter'. | 
 | // void set topLevelFieldAndDuplicateSetter(int? value) {} | 
 | //          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:8:6: Context: Field 'topLevelFieldAndDuplicateSetter' with the implicit setter. | 
 | // int? topLevelFieldAndDuplicateSetter; | 
 | //      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:10:10: Error: 'topLevelFieldAndDuplicateSetter' is already declared in this scope. | 
 | // void set topLevelFieldAndDuplicateSetter(int? value) {} | 
 | //          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:9:10: Context: Previous declaration of 'topLevelFieldAndDuplicateSetter'. | 
 | // void set topLevelFieldAndDuplicateSetter(int? value) {} | 
 | //          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:13:12: Error: 'duplicateTopLevelFieldAndSetter1' is already declared in this scope. | 
 | // final int? duplicateTopLevelFieldAndSetter1 = null; | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:12:6: Context: Previous declaration of 'duplicateTopLevelFieldAndSetter1'. | 
 | // int? duplicateTopLevelFieldAndSetter1; | 
 | //      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:14:10: Error: Conflicts with the implicit setter of the field 'duplicateTopLevelFieldAndSetter1'. | 
 | // void set duplicateTopLevelFieldAndSetter1(int? value) {} | 
 | //          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:12:6: Context: Field 'duplicateTopLevelFieldAndSetter1' with the implicit setter. | 
 | // int? duplicateTopLevelFieldAndSetter1; | 
 | //      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:17:6: Error: 'duplicateTopLevelFieldAndSetter2' is already declared in this scope. | 
 | // int? duplicateTopLevelFieldAndSetter2; | 
 | //      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:16:12: Context: Previous declaration of 'duplicateTopLevelFieldAndSetter2'. | 
 | // final int? duplicateTopLevelFieldAndSetter2 = null; | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:21:10: Error: Conflicts with the implicit setter of the field 'topLevelLateFinalFieldAndSetter'. | 
 | // void set topLevelLateFinalFieldAndSetter(int? value) {} | 
 | //          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:20:17: Context: Field 'topLevelLateFinalFieldAndSetter' with the implicit setter. | 
 | // late final int? topLevelLateFinalFieldAndSetter; | 
 | //                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:24:10: Error: Conflicts with the implicit setter of the field 'topLevelLateFinalFieldAndDuplicateSetter'. | 
 | // void set topLevelLateFinalFieldAndDuplicateSetter(int? value) {} | 
 | //          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:23:17: Context: Field 'topLevelLateFinalFieldAndDuplicateSetter' with the implicit setter. | 
 | // late final int? topLevelLateFinalFieldAndDuplicateSetter; | 
 | //                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:25:10: Error: Conflicts with the implicit setter of the field 'topLevelLateFinalFieldAndDuplicateSetter'. | 
 | // void set topLevelLateFinalFieldAndDuplicateSetter(int? value) {} | 
 | //          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:23:17: Context: Field 'topLevelLateFinalFieldAndDuplicateSetter' with the implicit setter. | 
 | // late final int? topLevelLateFinalFieldAndDuplicateSetter; | 
 | //                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:25:10: Error: 'topLevelLateFinalFieldAndDuplicateSetter' is already declared in this scope. | 
 | // void set topLevelLateFinalFieldAndDuplicateSetter(int? value) {} | 
 | //          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:24:10: Context: Previous declaration of 'topLevelLateFinalFieldAndDuplicateSetter'. | 
 | // void set topLevelLateFinalFieldAndDuplicateSetter(int? value) {} | 
 | //          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:29:12: Error: Conflicts with the implicit setter of the field 'instanceFieldAndSetter'. | 
 | //   void set instanceFieldAndSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:28:8: Context: Field 'instanceFieldAndSetter' with the implicit setter. | 
 | //   int? instanceFieldAndSetter; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:32:12: Error: Conflicts with the implicit setter of the field 'instanceFieldAndDuplicateSetter'. | 
 | //   void set instanceFieldAndDuplicateSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:31:8: Context: Field 'instanceFieldAndDuplicateSetter' with the implicit setter. | 
 | //   int? instanceFieldAndDuplicateSetter; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:33:12: Error: Conflicts with the implicit setter of the field 'instanceFieldAndDuplicateSetter'. | 
 | //   void set instanceFieldAndDuplicateSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:31:8: Context: Field 'instanceFieldAndDuplicateSetter' with the implicit setter. | 
 | //   int? instanceFieldAndDuplicateSetter; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:33:12: Error: 'instanceFieldAndDuplicateSetter' is already declared in this scope. | 
 | //   void set instanceFieldAndDuplicateSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:32:12: Context: Previous declaration of 'instanceFieldAndDuplicateSetter'. | 
 | //   void set instanceFieldAndDuplicateSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:36:14: Error: 'duplicateInstanceFieldAndSetter1' is already declared in this scope. | 
 | //   final int? duplicateInstanceFieldAndSetter1 = null; | 
 | //              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:35:8: Context: Previous declaration of 'duplicateInstanceFieldAndSetter1'. | 
 | //   int? duplicateInstanceFieldAndSetter1; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:37:12: Error: Conflicts with the implicit setter of the field 'duplicateInstanceFieldAndSetter1'. | 
 | //   void set duplicateInstanceFieldAndSetter1(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:35:8: Context: Field 'duplicateInstanceFieldAndSetter1' with the implicit setter. | 
 | //   int? duplicateInstanceFieldAndSetter1; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:40:8: Error: 'duplicateInstanceFieldAndSetter2' is already declared in this scope. | 
 | //   int? duplicateInstanceFieldAndSetter2; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:39:14: Context: Previous declaration of 'duplicateInstanceFieldAndSetter2'. | 
 | //   final int? duplicateInstanceFieldAndSetter2 = null; | 
 | //              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:44:12: Error: Conflicts with the implicit setter of the field 'instanceLateFinalFieldAndSetter'. | 
 | //   void set instanceLateFinalFieldAndSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:43:19: Context: Field 'instanceLateFinalFieldAndSetter' with the implicit setter. | 
 | //   late final int? instanceLateFinalFieldAndSetter; | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:47:12: Error: Conflicts with the implicit setter of the field 'instanceLateFinalFieldAndDuplicateSetter'. | 
 | //   void set instanceLateFinalFieldAndDuplicateSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:46:19: Context: Field 'instanceLateFinalFieldAndDuplicateSetter' with the implicit setter. | 
 | //   late final int? instanceLateFinalFieldAndDuplicateSetter; | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:48:12: Error: Conflicts with the implicit setter of the field 'instanceLateFinalFieldAndDuplicateSetter'. | 
 | //   void set instanceLateFinalFieldAndDuplicateSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:46:19: Context: Field 'instanceLateFinalFieldAndDuplicateSetter' with the implicit setter. | 
 | //   late final int? instanceLateFinalFieldAndDuplicateSetter; | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:48:12: Error: 'instanceLateFinalFieldAndDuplicateSetter' is already declared in this scope. | 
 | //   void set instanceLateFinalFieldAndDuplicateSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:47:12: Context: Previous declaration of 'instanceLateFinalFieldAndDuplicateSetter'. | 
 | //   void set instanceLateFinalFieldAndDuplicateSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:51:19: Error: Conflicts with the implicit setter of the field 'staticFieldAndSetter'. | 
 | //   static void set staticFieldAndSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:50:15: Context: Field 'staticFieldAndSetter' with the implicit setter. | 
 | //   static int? staticFieldAndSetter; | 
 | //               ^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:54:19: Error: Conflicts with the implicit setter of the field 'staticFieldAndDuplicateSetter'. | 
 | //   static void set staticFieldAndDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:53:15: Context: Field 'staticFieldAndDuplicateSetter' with the implicit setter. | 
 | //   static int? staticFieldAndDuplicateSetter; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:55:19: Error: Conflicts with the implicit setter of the field 'staticFieldAndDuplicateSetter'. | 
 | //   static void set staticFieldAndDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:53:15: Context: Field 'staticFieldAndDuplicateSetter' with the implicit setter. | 
 | //   static int? staticFieldAndDuplicateSetter; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:55:19: Error: 'staticFieldAndDuplicateSetter' is already declared in this scope. | 
 | //   static void set staticFieldAndDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:54:19: Context: Previous declaration of 'staticFieldAndDuplicateSetter'. | 
 | //   static void set staticFieldAndDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:58:21: Error: 'duplicateStaticFieldAndSetter1' is already declared in this scope. | 
 | //   static final int? duplicateStaticFieldAndSetter1 = null; | 
 | //                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:57:15: Context: Previous declaration of 'duplicateStaticFieldAndSetter1'. | 
 | //   static int? duplicateStaticFieldAndSetter1; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:59:19: Error: Conflicts with the implicit setter of the field 'duplicateStaticFieldAndSetter1'. | 
 | //   static void set duplicateStaticFieldAndSetter1(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:57:15: Context: Field 'duplicateStaticFieldAndSetter1' with the implicit setter. | 
 | //   static int? duplicateStaticFieldAndSetter1; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:62:15: Error: 'duplicateStaticFieldAndSetter2' is already declared in this scope. | 
 | //   static int? duplicateStaticFieldAndSetter2; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:61:21: Context: Previous declaration of 'duplicateStaticFieldAndSetter2'. | 
 | //   static final int? duplicateStaticFieldAndSetter2 = null; | 
 | //                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:66:19: Error: Conflicts with the implicit setter of the field 'staticLateFinalFieldAndSetter'. | 
 | //   static void set staticLateFinalFieldAndSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:65:26: Context: Field 'staticLateFinalFieldAndSetter' with the implicit setter. | 
 | //   static late final int? staticLateFinalFieldAndSetter; | 
 | //                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:69:19: Error: Conflicts with the implicit setter of the field 'staticLateFinalFieldAndDuplicateSetter'. | 
 | //   static void set staticLateFinalFieldAndDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:68:26: Context: Field 'staticLateFinalFieldAndDuplicateSetter' with the implicit setter. | 
 | //   static late final int? staticLateFinalFieldAndDuplicateSetter; | 
 | //                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:70:19: Error: Conflicts with the implicit setter of the field 'staticLateFinalFieldAndDuplicateSetter'. | 
 | //   static void set staticLateFinalFieldAndDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:68:26: Context: Field 'staticLateFinalFieldAndDuplicateSetter' with the implicit setter. | 
 | //   static late final int? staticLateFinalFieldAndDuplicateSetter; | 
 | //                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:70:19: Error: 'staticLateFinalFieldAndDuplicateSetter' is already declared in this scope. | 
 | //   static void set staticLateFinalFieldAndDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:69:19: Context: Previous declaration of 'staticLateFinalFieldAndDuplicateSetter'. | 
 | //   static void set staticLateFinalFieldAndDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:73:12: Error: Conflicts with the implicit setter of the field 'staticFieldAndInstanceSetter'. | 
 | //   void set staticFieldAndInstanceSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:72:15: Context: Field 'staticFieldAndInstanceSetter' with the implicit setter. | 
 | //   static int? staticFieldAndInstanceSetter; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:76:12: Error: Conflicts with the implicit setter of the field 'staticFieldAndInstanceDuplicateSetter'. | 
 | //   void set staticFieldAndInstanceDuplicateSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:75:15: Context: Field 'staticFieldAndInstanceDuplicateSetter' with the implicit setter. | 
 | //   static int? staticFieldAndInstanceDuplicateSetter; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:77:12: Error: Conflicts with the implicit setter of the field 'staticFieldAndInstanceDuplicateSetter'. | 
 | //   void set staticFieldAndInstanceDuplicateSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:75:15: Context: Field 'staticFieldAndInstanceDuplicateSetter' with the implicit setter. | 
 | //   static int? staticFieldAndInstanceDuplicateSetter; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:77:12: Error: 'staticFieldAndInstanceDuplicateSetter' is already declared in this scope. | 
 | //   void set staticFieldAndInstanceDuplicateSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:76:12: Context: Previous declaration of 'staticFieldAndInstanceDuplicateSetter'. | 
 | //   void set staticFieldAndInstanceDuplicateSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:80:19: Error: Conflicts with the implicit setter of the field 'instanceFieldAndStaticSetter'. | 
 | //   static void set instanceFieldAndStaticSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:79:8: Context: Field 'instanceFieldAndStaticSetter' with the implicit setter. | 
 | //   int? instanceFieldAndStaticSetter; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:83:19: Error: Conflicts with the implicit setter of the field 'instanceFieldAndStaticDuplicateSetter'. | 
 | //   static void set instanceFieldAndStaticDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:82:8: Context: Field 'instanceFieldAndStaticDuplicateSetter' with the implicit setter. | 
 | //   int? instanceFieldAndStaticDuplicateSetter; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:84:19: Error: Conflicts with the implicit setter of the field 'instanceFieldAndStaticDuplicateSetter'. | 
 | //   static void set instanceFieldAndStaticDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:82:8: Context: Field 'instanceFieldAndStaticDuplicateSetter' with the implicit setter. | 
 | //   int? instanceFieldAndStaticDuplicateSetter; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:84:19: Error: 'instanceFieldAndStaticDuplicateSetter' is already declared in this scope. | 
 | //   static void set instanceFieldAndStaticDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:83:19: Context: Previous declaration of 'instanceFieldAndStaticDuplicateSetter'. | 
 | //   static void set instanceFieldAndStaticDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:87:14: Error: 'duplicateInstanceFieldAndStaticSetter1' is already declared in this scope. | 
 | //   final int? duplicateInstanceFieldAndStaticSetter1 = null; | 
 | //              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:86:8: Context: Previous declaration of 'duplicateInstanceFieldAndStaticSetter1'. | 
 | //   int? duplicateInstanceFieldAndStaticSetter1; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:88:19: Error: Conflicts with the implicit setter of the field 'duplicateInstanceFieldAndStaticSetter1'. | 
 | //   static void set duplicateInstanceFieldAndStaticSetter1(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:86:8: Context: Field 'duplicateInstanceFieldAndStaticSetter1' with the implicit setter. | 
 | //   int? duplicateInstanceFieldAndStaticSetter1; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:88:19: Error: Static property 'duplicateInstanceFieldAndStaticSetter1' conflicts with instance property of the same name. | 
 | //   static void set duplicateInstanceFieldAndStaticSetter1(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:87:14: Context: Conflicting instance property 'duplicateInstanceFieldAndStaticSetter1'. | 
 | //   final int? duplicateInstanceFieldAndStaticSetter1 = null; | 
 | //              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:91:8: Error: 'duplicateInstanceFieldAndStaticSetter2' is already declared in this scope. | 
 | //   int? duplicateInstanceFieldAndStaticSetter2; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:90:14: Context: Previous declaration of 'duplicateInstanceFieldAndStaticSetter2'. | 
 | //   final int? duplicateInstanceFieldAndStaticSetter2 = null; | 
 | //              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:92:19: Error: Static property 'duplicateInstanceFieldAndStaticSetter2' conflicts with instance property of the same name. | 
 | //   static void set duplicateInstanceFieldAndStaticSetter2(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:90:14: Context: Conflicting instance property 'duplicateInstanceFieldAndStaticSetter2'. | 
 | //   final int? duplicateInstanceFieldAndStaticSetter2 = null; | 
 | //              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:92:19: Error: Conflicts with the implicit setter of the field 'duplicateInstanceFieldAndStaticSetter2'. | 
 | //   static void set duplicateInstanceFieldAndStaticSetter2(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:91:8: Context: Field 'duplicateInstanceFieldAndStaticSetter2' with the implicit setter. | 
 | //   int? duplicateInstanceFieldAndStaticSetter2; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:95:21: Error: 'duplicateStaticFieldAndInstanceSetter1' is already declared in this scope. | 
 | //   static final int? duplicateStaticFieldAndInstanceSetter1 = null; | 
 | //                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:94:15: Context: Previous declaration of 'duplicateStaticFieldAndInstanceSetter1'. | 
 | //   static int? duplicateStaticFieldAndInstanceSetter1; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:96:12: Error: Conflicts with the implicit setter of the field 'duplicateStaticFieldAndInstanceSetter1'. | 
 | //   void set duplicateStaticFieldAndInstanceSetter1(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:94:15: Context: Field 'duplicateStaticFieldAndInstanceSetter1' with the implicit setter. | 
 | //   static int? duplicateStaticFieldAndInstanceSetter1; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:96:12: Error: Instance property 'duplicateStaticFieldAndInstanceSetter1' conflicts with static property of the same name. | 
 | //   void set duplicateStaticFieldAndInstanceSetter1(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:95:21: Context: Conflicting static property 'duplicateStaticFieldAndInstanceSetter1'. | 
 | //   static final int? duplicateStaticFieldAndInstanceSetter1 = null; | 
 | //                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:99:15: Error: 'duplicateStaticFieldAndInstanceSetter2' is already declared in this scope. | 
 | //   static int? duplicateStaticFieldAndInstanceSetter2; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:98:21: Context: Previous declaration of 'duplicateStaticFieldAndInstanceSetter2'. | 
 | //   static final int? duplicateStaticFieldAndInstanceSetter2 = null; | 
 | //                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:100:12: Error: Instance property 'duplicateStaticFieldAndInstanceSetter2' conflicts with static property of the same name. | 
 | //   void set duplicateStaticFieldAndInstanceSetter2(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:98:21: Context: Conflicting static property 'duplicateStaticFieldAndInstanceSetter2'. | 
 | //   static final int? duplicateStaticFieldAndInstanceSetter2 = null; | 
 | //                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:100:12: Error: Conflicts with the implicit setter of the field 'duplicateStaticFieldAndInstanceSetter2'. | 
 | //   void set duplicateStaticFieldAndInstanceSetter2(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:99:15: Context: Field 'duplicateStaticFieldAndInstanceSetter2' with the implicit setter. | 
 | //   static int? duplicateStaticFieldAndInstanceSetter2; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:105:12: Error: Conflicts with the implicit setter of the field 'extensionInstanceFieldAndSetter'. | 
 | //   void set extensionInstanceFieldAndSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:104:8: Context: Field 'extensionInstanceFieldAndSetter' with the implicit setter. | 
 | //   int? extensionInstanceFieldAndSetter; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:108:12: Error: Conflicts with the implicit setter of the field 'extensionInstanceFieldAndDuplicateSetter'. | 
 | //   void set extensionInstanceFieldAndDuplicateSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:107:8: Context: Field 'extensionInstanceFieldAndDuplicateSetter' with the implicit setter. | 
 | //   int? extensionInstanceFieldAndDuplicateSetter; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:109:12: Error: Conflicts with the implicit setter of the field 'extensionInstanceFieldAndDuplicateSetter'. | 
 | //   void set extensionInstanceFieldAndDuplicateSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:107:8: Context: Field 'extensionInstanceFieldAndDuplicateSetter' with the implicit setter. | 
 | //   int? extensionInstanceFieldAndDuplicateSetter; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:109:12: Error: 'extensionInstanceFieldAndDuplicateSetter' is already declared in this scope. | 
 | //   void set extensionInstanceFieldAndDuplicateSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:108:12: Context: Previous declaration of 'extensionInstanceFieldAndDuplicateSetter'. | 
 | //   void set extensionInstanceFieldAndDuplicateSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:112:14: Error: 'duplicateExtensionInstanceFieldAndSetter1' is already declared in this scope. | 
 | //   final int? duplicateExtensionInstanceFieldAndSetter1 = null; | 
 | //              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:111:8: Context: Previous declaration of 'duplicateExtensionInstanceFieldAndSetter1'. | 
 | //   int? duplicateExtensionInstanceFieldAndSetter1; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:113:12: Error: Conflicts with the implicit setter of the field 'duplicateExtensionInstanceFieldAndSetter1'. | 
 | //   void set duplicateExtensionInstanceFieldAndSetter1(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:111:8: Context: Field 'duplicateExtensionInstanceFieldAndSetter1' with the implicit setter. | 
 | //   int? duplicateExtensionInstanceFieldAndSetter1; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:116:8: Error: 'duplicateExtensionInstanceFieldAndSetter2' is already declared in this scope. | 
 | //   int? duplicateExtensionInstanceFieldAndSetter2; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:115:14: Context: Previous declaration of 'duplicateExtensionInstanceFieldAndSetter2'. | 
 | //   final int? duplicateExtensionInstanceFieldAndSetter2 = null; | 
 | //              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:120:19: Error: Conflicts with the implicit setter of the field 'extensionStaticFieldAndSetter'. | 
 | //   static void set extensionStaticFieldAndSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:119:15: Context: Field 'extensionStaticFieldAndSetter' with the implicit setter. | 
 | //   static int? extensionStaticFieldAndSetter; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:123:19: Error: Conflicts with the implicit setter of the field 'extensionStaticFieldAndDuplicateSetter'. | 
 | //   static void set extensionStaticFieldAndDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:122:15: Context: Field 'extensionStaticFieldAndDuplicateSetter' with the implicit setter. | 
 | //   static int? extensionStaticFieldAndDuplicateSetter; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:124:19: Error: Conflicts with the implicit setter of the field 'extensionStaticFieldAndDuplicateSetter'. | 
 | //   static void set extensionStaticFieldAndDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:122:15: Context: Field 'extensionStaticFieldAndDuplicateSetter' with the implicit setter. | 
 | //   static int? extensionStaticFieldAndDuplicateSetter; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:124:19: Error: 'extensionStaticFieldAndDuplicateSetter' is already declared in this scope. | 
 | //   static void set extensionStaticFieldAndDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:123:19: Context: Previous declaration of 'extensionStaticFieldAndDuplicateSetter'. | 
 | //   static void set extensionStaticFieldAndDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:127:21: Error: 'duplicateExtensionStaticFieldAndSetter1' is already declared in this scope. | 
 | //   static final int? duplicateExtensionStaticFieldAndSetter1 = null; | 
 | //                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:126:15: Context: Previous declaration of 'duplicateExtensionStaticFieldAndSetter1'. | 
 | //   static int? duplicateExtensionStaticFieldAndSetter1; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:128:19: Error: Conflicts with the implicit setter of the field 'duplicateExtensionStaticFieldAndSetter1'. | 
 | //   static void set duplicateExtensionStaticFieldAndSetter1(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:126:15: Context: Field 'duplicateExtensionStaticFieldAndSetter1' with the implicit setter. | 
 | //   static int? duplicateExtensionStaticFieldAndSetter1; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:131:15: Error: 'duplicateExtensionStaticFieldAndSetter2' is already declared in this scope. | 
 | //   static int? duplicateExtensionStaticFieldAndSetter2; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:130:21: Context: Previous declaration of 'duplicateExtensionStaticFieldAndSetter2'. | 
 | //   static final int? duplicateExtensionStaticFieldAndSetter2 = null; | 
 | //                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:135:19: Error: Conflicts with the implicit setter of the field 'extensionStaticLateFinalFieldAndSetter'. | 
 | //   static void set extensionStaticLateFinalFieldAndSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:134:26: Context: Field 'extensionStaticLateFinalFieldAndSetter' with the implicit setter. | 
 | //   static late final int? extensionStaticLateFinalFieldAndSetter; | 
 | //                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:138:19: Error: Conflicts with the implicit setter of the field 'extensionStaticLateFinalFieldAndDuplicateSetter'. | 
 | //   static void set extensionStaticLateFinalFieldAndDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:137:26: Context: Field 'extensionStaticLateFinalFieldAndDuplicateSetter' with the implicit setter. | 
 | //   static late final int? extensionStaticLateFinalFieldAndDuplicateSetter; | 
 | //                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:139:19: Error: Conflicts with the implicit setter of the field 'extensionStaticLateFinalFieldAndDuplicateSetter'. | 
 | //   static void set extensionStaticLateFinalFieldAndDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:137:26: Context: Field 'extensionStaticLateFinalFieldAndDuplicateSetter' with the implicit setter. | 
 | //   static late final int? extensionStaticLateFinalFieldAndDuplicateSetter; | 
 | //                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:139:19: Error: 'extensionStaticLateFinalFieldAndDuplicateSetter' is already declared in this scope. | 
 | //   static void set extensionStaticLateFinalFieldAndDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:138:19: Context: Previous declaration of 'extensionStaticLateFinalFieldAndDuplicateSetter'. | 
 | //   static void set extensionStaticLateFinalFieldAndDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:142:12: Error: Conflicts with the implicit setter of the field 'extensionStaticFieldAndInstanceSetter'. | 
 | //   void set extensionStaticFieldAndInstanceSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:141:15: Context: Field 'extensionStaticFieldAndInstanceSetter' with the implicit setter. | 
 | //   static int? extensionStaticFieldAndInstanceSetter; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:145:12: Error: Conflicts with the implicit setter of the field 'extensionStaticFieldAndInstanceDuplicateSetter'. | 
 | //   void set extensionStaticFieldAndInstanceDuplicateSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:144:15: Context: Field 'extensionStaticFieldAndInstanceDuplicateSetter' with the implicit setter. | 
 | //   static int? extensionStaticFieldAndInstanceDuplicateSetter; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:146:12: Error: Conflicts with the implicit setter of the field 'extensionStaticFieldAndInstanceDuplicateSetter'. | 
 | //   void set extensionStaticFieldAndInstanceDuplicateSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:144:15: Context: Field 'extensionStaticFieldAndInstanceDuplicateSetter' with the implicit setter. | 
 | //   static int? extensionStaticFieldAndInstanceDuplicateSetter; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:146:12: Error: 'extensionStaticFieldAndInstanceDuplicateSetter' is already declared in this scope. | 
 | //   void set extensionStaticFieldAndInstanceDuplicateSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:145:12: Context: Previous declaration of 'extensionStaticFieldAndInstanceDuplicateSetter'. | 
 | //   void set extensionStaticFieldAndInstanceDuplicateSetter(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:149:19: Error: Conflicts with the implicit setter of the field 'extensionInstanceFieldAndStaticSetter'. | 
 | //   static void set extensionInstanceFieldAndStaticSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:148:8: Context: Field 'extensionInstanceFieldAndStaticSetter' with the implicit setter. | 
 | //   int? extensionInstanceFieldAndStaticSetter; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:152:19: Error: Conflicts with the implicit setter of the field 'extensionInstanceFieldAndStaticDuplicateSetter'. | 
 | //   static void set extensionInstanceFieldAndStaticDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:151:8: Context: Field 'extensionInstanceFieldAndStaticDuplicateSetter' with the implicit setter. | 
 | //   int? extensionInstanceFieldAndStaticDuplicateSetter; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:153:19: Error: Conflicts with the implicit setter of the field 'extensionInstanceFieldAndStaticDuplicateSetter'. | 
 | //   static void set extensionInstanceFieldAndStaticDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:151:8: Context: Field 'extensionInstanceFieldAndStaticDuplicateSetter' with the implicit setter. | 
 | //   int? extensionInstanceFieldAndStaticDuplicateSetter; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:153:19: Error: 'extensionInstanceFieldAndStaticDuplicateSetter' is already declared in this scope. | 
 | //   static void set extensionInstanceFieldAndStaticDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:152:19: Context: Previous declaration of 'extensionInstanceFieldAndStaticDuplicateSetter'. | 
 | //   static void set extensionInstanceFieldAndStaticDuplicateSetter(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:156:14: Error: 'duplicateExtensionInstanceFieldAndStaticSetter1' is already declared in this scope. | 
 | //   final int? duplicateExtensionInstanceFieldAndStaticSetter1 = null; | 
 | //              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:155:8: Context: Previous declaration of 'duplicateExtensionInstanceFieldAndStaticSetter1'. | 
 | //   int? duplicateExtensionInstanceFieldAndStaticSetter1; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:157:19: Error: Conflicts with the implicit setter of the field 'duplicateExtensionInstanceFieldAndStaticSetter1'. | 
 | //   static void set duplicateExtensionInstanceFieldAndStaticSetter1(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:155:8: Context: Field 'duplicateExtensionInstanceFieldAndStaticSetter1' with the implicit setter. | 
 | //   int? duplicateExtensionInstanceFieldAndStaticSetter1; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:157:19: Error: Static property 'duplicateExtensionInstanceFieldAndStaticSetter1' conflicts with instance property of the same name. | 
 | //   static void set duplicateExtensionInstanceFieldAndStaticSetter1(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:156:14: Context: Conflicting instance property 'duplicateExtensionInstanceFieldAndStaticSetter1'. | 
 | //   final int? duplicateExtensionInstanceFieldAndStaticSetter1 = null; | 
 | //              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:160:8: Error: 'duplicateExtensionInstanceFieldAndStaticSetter2' is already declared in this scope. | 
 | //   int? duplicateExtensionInstanceFieldAndStaticSetter2; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:159:14: Context: Previous declaration of 'duplicateExtensionInstanceFieldAndStaticSetter2'. | 
 | //   final int? duplicateExtensionInstanceFieldAndStaticSetter2 = null; | 
 | //              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:161:19: Error: Static property 'duplicateExtensionInstanceFieldAndStaticSetter2' conflicts with instance property of the same name. | 
 | //   static void set duplicateExtensionInstanceFieldAndStaticSetter2(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:159:14: Context: Conflicting instance property 'duplicateExtensionInstanceFieldAndStaticSetter2'. | 
 | //   final int? duplicateExtensionInstanceFieldAndStaticSetter2 = null; | 
 | //              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:161:19: Error: Conflicts with the implicit setter of the field 'duplicateExtensionInstanceFieldAndStaticSetter2'. | 
 | //   static void set duplicateExtensionInstanceFieldAndStaticSetter2(int? value) {} | 
 | //                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:160:8: Context: Field 'duplicateExtensionInstanceFieldAndStaticSetter2' with the implicit setter. | 
 | //   int? duplicateExtensionInstanceFieldAndStaticSetter2; | 
 | //        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:164:21: Error: 'duplicateExtensionStaticFieldAndInstanceSetter1' is already declared in this scope. | 
 | //   static final int? duplicateExtensionStaticFieldAndInstanceSetter1 = null; | 
 | //                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:163:15: Context: Previous declaration of 'duplicateExtensionStaticFieldAndInstanceSetter1'. | 
 | //   static int? duplicateExtensionStaticFieldAndInstanceSetter1; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:165:12: Error: Conflicts with the implicit setter of the field 'duplicateExtensionStaticFieldAndInstanceSetter1'. | 
 | //   void set duplicateExtensionStaticFieldAndInstanceSetter1(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:163:15: Context: Field 'duplicateExtensionStaticFieldAndInstanceSetter1' with the implicit setter. | 
 | //   static int? duplicateExtensionStaticFieldAndInstanceSetter1; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:165:12: Error: Instance property 'duplicateExtensionStaticFieldAndInstanceSetter1' conflicts with static property of the same name. | 
 | //   void set duplicateExtensionStaticFieldAndInstanceSetter1(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:164:21: Context: Conflicting static property 'duplicateExtensionStaticFieldAndInstanceSetter1'. | 
 | //   static final int? duplicateExtensionStaticFieldAndInstanceSetter1 = null; | 
 | //                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:168:15: Error: 'duplicateExtensionStaticFieldAndInstanceSetter2' is already declared in this scope. | 
 | //   static int? duplicateExtensionStaticFieldAndInstanceSetter2; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:167:21: Context: Previous declaration of 'duplicateExtensionStaticFieldAndInstanceSetter2'. | 
 | //   static final int? duplicateExtensionStaticFieldAndInstanceSetter2 = null; | 
 | //                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:169:12: Error: Instance property 'duplicateExtensionStaticFieldAndInstanceSetter2' conflicts with static property of the same name. | 
 | //   void set duplicateExtensionStaticFieldAndInstanceSetter2(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:167:21: Context: Conflicting static property 'duplicateExtensionStaticFieldAndInstanceSetter2'. | 
 | //   static final int? duplicateExtensionStaticFieldAndInstanceSetter2 = null; | 
 | //                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:169:12: Error: Conflicts with the implicit setter of the field 'duplicateExtensionStaticFieldAndInstanceSetter2'. | 
 | //   void set duplicateExtensionStaticFieldAndInstanceSetter2(int? value) {} | 
 | //            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:168:15: Context: Field 'duplicateExtensionStaticFieldAndInstanceSetter2' with the implicit setter. | 
 | //   static int? duplicateExtensionStaticFieldAndInstanceSetter2; | 
 | //               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:173:28: Error: Can't use 'topLevelFieldAndSetter' because it is declared more than once. | 
 | //   topLevelFieldAndSetter = topLevelFieldAndSetter; | 
 | //                            ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:173:26: Error: Can't assign to this. | 
 | //   topLevelFieldAndSetter = topLevelFieldAndSetter; | 
 | //                          ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:174:37: Error: Can't use 'topLevelFieldAndDuplicateSetter' because it is declared more than once. | 
 | //   topLevelFieldAndDuplicateSetter = topLevelFieldAndDuplicateSetter; | 
 | //                                     ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:174:35: Error: Can't assign to this. | 
 | //   topLevelFieldAndDuplicateSetter = topLevelFieldAndDuplicateSetter; | 
 | //                                   ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:175:37: Error: Can't use 'topLevelLateFinalFieldAndSetter' because it is declared more than once. | 
 | //   topLevelLateFinalFieldAndSetter = topLevelLateFinalFieldAndSetter; | 
 | //                                     ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:175:35: Error: Can't assign to this. | 
 | //   topLevelLateFinalFieldAndSetter = topLevelLateFinalFieldAndSetter; | 
 | //                                   ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:177:7: Error: Can't use 'topLevelLateFinalFieldAndDuplicateSetter' because it is declared more than once. | 
 | //       topLevelLateFinalFieldAndDuplicateSetter; | 
 | //       ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:176:44: Error: Can't assign to this. | 
 | //   topLevelLateFinalFieldAndDuplicateSetter = | 
 | //                                            ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:178:38: Error: Can't use 'duplicateTopLevelFieldAndSetter1' because it is declared more than once. | 
 | //   duplicateTopLevelFieldAndSetter1 = duplicateTopLevelFieldAndSetter1; | 
 | //                                      ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:178:36: Error: Can't assign to this. | 
 | //   duplicateTopLevelFieldAndSetter1 = duplicateTopLevelFieldAndSetter1; | 
 | //                                    ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:179:38: Error: Can't use 'duplicateTopLevelFieldAndSetter2' because it is declared more than once. | 
 | //   duplicateTopLevelFieldAndSetter2 = duplicateTopLevelFieldAndSetter2; | 
 | //                                      ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:179:36: Error: Can't assign to this. | 
 | //   duplicateTopLevelFieldAndSetter2 = duplicateTopLevelFieldAndSetter2; | 
 | //                                    ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:193:9: Error: Can't use 'staticFieldAndSetter' because it is declared more than once. | 
 | //   Class.staticFieldAndSetter = Class.staticFieldAndSetter; | 
 | //         ^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:193:38: Error: Can't use 'staticFieldAndSetter' because it is declared more than once. | 
 | //   Class.staticFieldAndSetter = Class.staticFieldAndSetter; | 
 | //                                      ^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:193:30: Error: Can't assign to this. | 
 | //   Class.staticFieldAndSetter = Class.staticFieldAndSetter; | 
 | //                              ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:194:9: Error: Can't use 'staticFieldAndDuplicateSetter' because it is declared more than once. | 
 | //   Class.staticFieldAndDuplicateSetter = Class.staticFieldAndDuplicateSetter; | 
 | //         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:194:47: Error: Can't use 'staticFieldAndDuplicateSetter' because it is declared more than once. | 
 | //   Class.staticFieldAndDuplicateSetter = Class.staticFieldAndDuplicateSetter; | 
 | //                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:194:39: Error: Can't assign to this. | 
 | //   Class.staticFieldAndDuplicateSetter = Class.staticFieldAndDuplicateSetter; | 
 | //                                       ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:195:9: Error: Can't use 'staticLateFinalFieldAndSetter' because it is declared more than once. | 
 | //   Class.staticLateFinalFieldAndSetter = Class.staticLateFinalFieldAndSetter; | 
 | //         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:195:47: Error: Can't use 'staticLateFinalFieldAndSetter' because it is declared more than once. | 
 | //   Class.staticLateFinalFieldAndSetter = Class.staticLateFinalFieldAndSetter; | 
 | //                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:195:39: Error: Can't assign to this. | 
 | //   Class.staticLateFinalFieldAndSetter = Class.staticLateFinalFieldAndSetter; | 
 | //                                       ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:196:9: Error: Can't use 'staticLateFinalFieldAndDuplicateSetter' because it is declared more than once. | 
 | //   Class.staticLateFinalFieldAndDuplicateSetter = | 
 | //         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:197:13: Error: Can't use 'staticLateFinalFieldAndDuplicateSetter' because it is declared more than once. | 
 | //       Class.staticLateFinalFieldAndDuplicateSetter; | 
 | //             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:196:48: Error: Can't assign to this. | 
 | //   Class.staticLateFinalFieldAndDuplicateSetter = | 
 | //                                                ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:198:9: Error: Can't use 'duplicateStaticFieldAndSetter1' because it is declared more than once. | 
 | //   Class.duplicateStaticFieldAndSetter1 = Class.duplicateStaticFieldAndSetter1; | 
 | //         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:198:48: Error: Can't use 'duplicateStaticFieldAndSetter1' because it is declared more than once. | 
 | //   Class.duplicateStaticFieldAndSetter1 = Class.duplicateStaticFieldAndSetter1; | 
 | //                                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:198:40: Error: Can't assign to this. | 
 | //   Class.duplicateStaticFieldAndSetter1 = Class.duplicateStaticFieldAndSetter1; | 
 | //                                        ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:199:9: Error: Can't use 'duplicateStaticFieldAndSetter2' because it is declared more than once. | 
 | //   Class.duplicateStaticFieldAndSetter2 = Class.duplicateStaticFieldAndSetter2; | 
 | //         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:199:48: Error: Can't use 'duplicateStaticFieldAndSetter2' because it is declared more than once. | 
 | //   Class.duplicateStaticFieldAndSetter2 = Class.duplicateStaticFieldAndSetter2; | 
 | //                                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:199:40: Error: Can't assign to this. | 
 | //   Class.duplicateStaticFieldAndSetter2 = Class.duplicateStaticFieldAndSetter2; | 
 | //                                        ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:201:42: Error: Can't use 'staticFieldAndInstanceSetter' because it is declared more than once. | 
 | //   c.staticFieldAndInstanceSetter = Class.staticFieldAndInstanceSetter; | 
 | //                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:202:9: Error: Can't use 'staticFieldAndInstanceSetter' because it is declared more than once. | 
 | //   Class.staticFieldAndInstanceSetter = Class.staticFieldAndInstanceSetter; | 
 | //         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:202:46: Error: Can't use 'staticFieldAndInstanceSetter' because it is declared more than once. | 
 | //   Class.staticFieldAndInstanceSetter = Class.staticFieldAndInstanceSetter; | 
 | //                                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:202:38: Error: Can't assign to this. | 
 | //   Class.staticFieldAndInstanceSetter = Class.staticFieldAndInstanceSetter; | 
 | //                                      ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:205:13: Error: Can't use 'staticFieldAndInstanceDuplicateSetter' because it is declared more than once. | 
 | //       Class.staticFieldAndInstanceDuplicateSetter; | 
 | //             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:206:9: Error: Can't use 'staticFieldAndInstanceDuplicateSetter' because it is declared more than once. | 
 | //   Class.staticFieldAndInstanceDuplicateSetter = | 
 | //         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:207:13: Error: Can't use 'staticFieldAndInstanceDuplicateSetter' because it is declared more than once. | 
 | //       Class.staticFieldAndInstanceDuplicateSetter; | 
 | //             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:206:47: Error: Can't assign to this. | 
 | //   Class.staticFieldAndInstanceDuplicateSetter = | 
 | //                                               ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:209:9: Error: Can't use 'instanceFieldAndStaticSetter' because it is declared more than once. | 
 | //   Class.instanceFieldAndStaticSetter = c.instanceFieldAndStaticSetter; | 
 | //         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:209:38: Error: Can't assign to this. | 
 | //   Class.instanceFieldAndStaticSetter = c.instanceFieldAndStaticSetter; | 
 | //                                      ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:212:9: Error: Can't use 'instanceFieldAndStaticDuplicateSetter' because it is declared more than once. | 
 | //   Class.instanceFieldAndStaticDuplicateSetter = | 
 | //         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:212:47: Error: Can't assign to this. | 
 | //   Class.instanceFieldAndStaticDuplicateSetter = | 
 | //                                               ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:218:13: Error: Can't use 'duplicateStaticFieldAndInstanceSetter1' because it is declared more than once. | 
 | //       Class.duplicateStaticFieldAndInstanceSetter1; | 
 | //             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:219:9: Error: Can't use 'duplicateStaticFieldAndInstanceSetter1' because it is declared more than once. | 
 | //   Class.duplicateStaticFieldAndInstanceSetter1 = | 
 | //         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:220:13: Error: Can't use 'duplicateStaticFieldAndInstanceSetter1' because it is declared more than once. | 
 | //       Class.duplicateStaticFieldAndInstanceSetter1; | 
 | //             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:219:48: Error: Can't assign to this. | 
 | //   Class.duplicateStaticFieldAndInstanceSetter1 = | 
 | //                                                ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:223:13: Error: Can't use 'duplicateStaticFieldAndInstanceSetter2' because it is declared more than once. | 
 | //       Class.duplicateStaticFieldAndInstanceSetter2; | 
 | //             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:224:9: Error: Can't use 'duplicateStaticFieldAndInstanceSetter2' because it is declared more than once. | 
 | //   Class.duplicateStaticFieldAndInstanceSetter2 = | 
 | //         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:225:13: Error: Can't use 'duplicateStaticFieldAndInstanceSetter2' because it is declared more than once. | 
 | //       Class.duplicateStaticFieldAndInstanceSetter2; | 
 | //             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:224:48: Error: Can't assign to this. | 
 | //   Class.duplicateStaticFieldAndInstanceSetter2 = | 
 | //                                                ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:227:9: Error: Can't use 'duplicateInstanceFieldAndStaticSetter1' because it is declared more than once. | 
 | //   Class.duplicateInstanceFieldAndStaticSetter1 = | 
 | //         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:227:48: Error: Can't assign to this. | 
 | //   Class.duplicateInstanceFieldAndStaticSetter1 = | 
 | //                                                ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:229:9: Error: Can't use 'duplicateInstanceFieldAndStaticSetter2' because it is declared more than once. | 
 | //   Class.duplicateInstanceFieldAndStaticSetter2 = | 
 | //         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:229:48: Error: Can't assign to this. | 
 | //   Class.duplicateInstanceFieldAndStaticSetter2 = | 
 | //                                                ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:241:13: Error: Can't use 'extensionStaticFieldAndSetter' because it is declared more than once. | 
 | //   Extension.extensionStaticFieldAndSetter = | 
 | //             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:242:17: Error: Can't use 'extensionStaticFieldAndSetter' because it is declared more than once. | 
 | //       Extension.extensionStaticFieldAndSetter; | 
 | //                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:241:43: Error: Can't assign to this. | 
 | //   Extension.extensionStaticFieldAndSetter = | 
 | //                                           ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:244:13: Error: Can't use 'extensionStaticFieldAndDuplicateSetter' because it is declared more than once. | 
 | //   Extension.extensionStaticFieldAndDuplicateSetter = | 
 | //             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:245:17: Error: Can't use 'extensionStaticFieldAndDuplicateSetter' because it is declared more than once. | 
 | //       Extension.extensionStaticFieldAndDuplicateSetter; | 
 | //                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:244:52: Error: Can't assign to this. | 
 | //   Extension.extensionStaticFieldAndDuplicateSetter = | 
 | //                                                    ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:247:13: Error: Can't use 'extensionStaticLateFinalFieldAndSetter' because it is declared more than once. | 
 | //   Extension.extensionStaticLateFinalFieldAndSetter = | 
 | //             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:248:17: Error: Can't use 'extensionStaticLateFinalFieldAndSetter' because it is declared more than once. | 
 | //       Extension.extensionStaticLateFinalFieldAndSetter; | 
 | //                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:247:52: Error: Can't assign to this. | 
 | //   Extension.extensionStaticLateFinalFieldAndSetter = | 
 | //                                                    ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:250:13: Error: Can't use 'extensionStaticLateFinalFieldAndDuplicateSetter' because it is declared more than once. | 
 | //   Extension.extensionStaticLateFinalFieldAndDuplicateSetter = | 
 | //             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:251:17: Error: Can't use 'extensionStaticLateFinalFieldAndDuplicateSetter' because it is declared more than once. | 
 | //       Extension.extensionStaticLateFinalFieldAndDuplicateSetter; | 
 | //                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:250:61: Error: Can't assign to this. | 
 | //   Extension.extensionStaticLateFinalFieldAndDuplicateSetter = | 
 | //                                                             ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:252:13: Error: Can't use 'duplicateExtensionStaticFieldAndSetter1' because it is declared more than once. | 
 | //   Extension.duplicateExtensionStaticFieldAndSetter1 = | 
 | //             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:253:17: Error: Can't use 'duplicateExtensionStaticFieldAndSetter1' because it is declared more than once. | 
 | //       Extension.duplicateExtensionStaticFieldAndSetter1; | 
 | //                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:252:53: Error: Can't assign to this. | 
 | //   Extension.duplicateExtensionStaticFieldAndSetter1 = | 
 | //                                                     ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:254:13: Error: Can't use 'duplicateExtensionStaticFieldAndSetter2' because it is declared more than once. | 
 | //   Extension.duplicateExtensionStaticFieldAndSetter2 = | 
 | //             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:255:17: Error: Can't use 'duplicateExtensionStaticFieldAndSetter2' because it is declared more than once. | 
 | //       Extension.duplicateExtensionStaticFieldAndSetter2; | 
 | //                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:254:53: Error: Can't assign to this. | 
 | //   Extension.duplicateExtensionStaticFieldAndSetter2 = | 
 | //                                                     ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:258:17: Error: Can't use 'extensionStaticFieldAndInstanceSetter' because it is declared more than once. | 
 | //       Extension.extensionStaticFieldAndInstanceSetter; | 
 | //                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:259:13: Error: Can't use 'extensionStaticFieldAndInstanceSetter' because it is declared more than once. | 
 | //   Extension.extensionStaticFieldAndInstanceSetter = | 
 | //             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:260:17: Error: Can't use 'extensionStaticFieldAndInstanceSetter' because it is declared more than once. | 
 | //       Extension.extensionStaticFieldAndInstanceSetter; | 
 | //                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:259:51: Error: Can't assign to this. | 
 | //   Extension.extensionStaticFieldAndInstanceSetter = | 
 | //                                                   ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:263:17: Error: Can't use 'extensionStaticFieldAndInstanceDuplicateSetter' because it is declared more than once. | 
 | //       Extension.extensionStaticFieldAndInstanceDuplicateSetter; | 
 | //                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:264:13: Error: Can't use 'extensionStaticFieldAndInstanceDuplicateSetter' because it is declared more than once. | 
 | //   Extension.extensionStaticFieldAndInstanceDuplicateSetter = | 
 | //             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:265:17: Error: Can't use 'extensionStaticFieldAndInstanceDuplicateSetter' because it is declared more than once. | 
 | //       Extension.extensionStaticFieldAndInstanceDuplicateSetter; | 
 | //                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:264:60: Error: Can't assign to this. | 
 | //   Extension.extensionStaticFieldAndInstanceDuplicateSetter = | 
 | //                                                            ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:267:13: Error: Can't use 'extensionInstanceFieldAndStaticSetter' because it is declared more than once. | 
 | //   Extension.extensionInstanceFieldAndStaticSetter = | 
 | //             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:267:51: Error: Can't assign to this. | 
 | //   Extension.extensionInstanceFieldAndStaticSetter = | 
 | //                                                   ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:272:13: Error: Can't use 'extensionInstanceFieldAndStaticDuplicateSetter' because it is declared more than once. | 
 | //   Extension.extensionInstanceFieldAndStaticDuplicateSetter = | 
 | //             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:272:60: Error: Can't assign to this. | 
 | //   Extension.extensionInstanceFieldAndStaticDuplicateSetter = | 
 | //                                                            ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:277:13: Error: Can't use 'duplicateExtensionInstanceFieldAndStaticSetter1' because it is declared more than once. | 
 | //   Extension.duplicateExtensionInstanceFieldAndStaticSetter1 = | 
 | //             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:277:61: Error: Can't assign to this. | 
 | //   Extension.duplicateExtensionInstanceFieldAndStaticSetter1 = | 
 | //                                                             ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:282:13: Error: Can't use 'duplicateExtensionInstanceFieldAndStaticSetter2' because it is declared more than once. | 
 | //   Extension.duplicateExtensionInstanceFieldAndStaticSetter2 = | 
 | //             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:282:61: Error: Can't assign to this. | 
 | //   Extension.duplicateExtensionInstanceFieldAndStaticSetter2 = | 
 | //                                                             ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:287:13: Error: Can't use 'duplicateExtensionStaticFieldAndInstanceSetter1' because it is declared more than once. | 
 | //   Extension.duplicateExtensionStaticFieldAndInstanceSetter1 = | 
 | //             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:288:17: Error: Can't use 'duplicateExtensionStaticFieldAndInstanceSetter1' because it is declared more than once. | 
 | //       Extension.duplicateExtensionStaticFieldAndInstanceSetter1; | 
 | //                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:287:61: Error: Can't assign to this. | 
 | //   Extension.duplicateExtensionStaticFieldAndInstanceSetter1 = | 
 | //                                                             ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:290:17: Error: Can't use 'duplicateExtensionStaticFieldAndInstanceSetter1' because it is declared more than once. | 
 | //       Extension.duplicateExtensionStaticFieldAndInstanceSetter1; | 
 | //                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:292:13: Error: Can't use 'duplicateExtensionStaticFieldAndInstanceSetter2' because it is declared more than once. | 
 | //   Extension.duplicateExtensionStaticFieldAndInstanceSetter2 = | 
 | //             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:293:17: Error: Can't use 'duplicateExtensionStaticFieldAndInstanceSetter2' because it is declared more than once. | 
 | //       Extension.duplicateExtensionStaticFieldAndInstanceSetter2; | 
 | //                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:292:61: Error: Can't assign to this. | 
 | //   Extension.duplicateExtensionStaticFieldAndInstanceSetter2 = | 
 | //                                                             ^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:295:17: Error: Can't use 'duplicateExtensionStaticFieldAndInstanceSetter2' because it is declared more than once. | 
 | //       Extension.duplicateExtensionStaticFieldAndInstanceSetter2; | 
 | //                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:190:5: Error: The setter 'duplicateInstanceFieldAndStaticSetter2' isn't defined for the class 'Class'. | 
 | //  - 'Class' is from 'pkg/front_end/testcases/nnbd/field_vs_setter.dart'. | 
 | // Try correcting the name to the name of an existing setter, or defining a setter or field named 'duplicateInstanceFieldAndStaticSetter2'. | 
 | //   c.duplicateInstanceFieldAndStaticSetter2 = | 
 | //     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:201:5: Error: The setter 'staticFieldAndInstanceSetter' isn't defined for the class 'Class'. | 
 | //  - 'Class' is from 'pkg/front_end/testcases/nnbd/field_vs_setter.dart'. | 
 | // Try correcting the name to the name of an existing setter, or defining a setter or field named 'staticFieldAndInstanceSetter'. | 
 | //   c.staticFieldAndInstanceSetter = Class.staticFieldAndInstanceSetter; | 
 | //     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:204:5: Error: The setter 'staticFieldAndInstanceDuplicateSetter' isn't defined for the class 'Class'. | 
 | //  - 'Class' is from 'pkg/front_end/testcases/nnbd/field_vs_setter.dart'. | 
 | // Try correcting the name to the name of an existing setter, or defining a setter or field named 'staticFieldAndInstanceDuplicateSetter'. | 
 | //   c.staticFieldAndInstanceDuplicateSetter = | 
 | //     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:217:5: Error: The setter 'duplicateStaticFieldAndInstanceSetter1' isn't defined for the class 'Class'. | 
 | //  - 'Class' is from 'pkg/front_end/testcases/nnbd/field_vs_setter.dart'. | 
 | // Try correcting the name to the name of an existing setter, or defining a setter or field named 'duplicateStaticFieldAndInstanceSetter1'. | 
 | //   c.duplicateStaticFieldAndInstanceSetter1 = | 
 | //     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:222:5: Error: The setter 'duplicateStaticFieldAndInstanceSetter2' isn't defined for the class 'Class'. | 
 | //  - 'Class' is from 'pkg/front_end/testcases/nnbd/field_vs_setter.dart'. | 
 | // Try correcting the name to the name of an existing setter, or defining a setter or field named 'duplicateStaticFieldAndInstanceSetter2'. | 
 | //   c.duplicateStaticFieldAndInstanceSetter2 = | 
 | //     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:232:41: Error: The getter 'extensionInstanceFieldAndSetter' isn't defined for the class 'int'. | 
 | // Try correcting the name to the name of an existing getter, or defining a getter or field named 'extensionInstanceFieldAndSetter'. | 
 | //   0.extensionInstanceFieldAndSetter = 0.extensionInstanceFieldAndSetter; | 
 | //                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:232:5: Error: The setter 'extensionInstanceFieldAndSetter' isn't defined for the class 'int'. | 
 | // Try correcting the name to the name of an existing setter, or defining a setter or field named 'extensionInstanceFieldAndSetter'. | 
 | //   0.extensionInstanceFieldAndSetter = 0.extensionInstanceFieldAndSetter; | 
 | //     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:234:9: Error: The getter 'extensionInstanceFieldAndDuplicateSetter' isn't defined for the class 'int'. | 
 | // Try correcting the name to the name of an existing getter, or defining a getter or field named 'extensionInstanceFieldAndDuplicateSetter'. | 
 | //       0.extensionInstanceFieldAndDuplicateSetter; | 
 | //         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:233:5: Error: The setter 'extensionInstanceFieldAndDuplicateSetter' isn't defined for the class 'int'. | 
 | // Try correcting the name to the name of an existing setter, or defining a setter or field named 'extensionInstanceFieldAndDuplicateSetter'. | 
 | //   0.extensionInstanceFieldAndDuplicateSetter = | 
 | //     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:237:9: Error: The getter 'duplicateExtensionInstanceFieldAndSetter1' isn't defined for the class 'int'. | 
 | // Try correcting the name to the name of an existing getter, or defining a getter or field named 'duplicateExtensionInstanceFieldAndSetter1'. | 
 | //       0.duplicateExtensionInstanceFieldAndSetter1; | 
 | //         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:236:5: Error: The setter 'duplicateExtensionInstanceFieldAndSetter1' isn't defined for the class 'int'. | 
 | // Try correcting the name to the name of an existing setter, or defining a setter or field named 'duplicateExtensionInstanceFieldAndSetter1'. | 
 | //   0.duplicateExtensionInstanceFieldAndSetter1 = | 
 | //     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:239:9: Error: The getter 'duplicateExtensionInstanceFieldAndSetter2' isn't defined for the class 'int'. | 
 | // Try correcting the name to the name of an existing getter, or defining a getter or field named 'duplicateExtensionInstanceFieldAndSetter2'. | 
 | //       0.duplicateExtensionInstanceFieldAndSetter2; | 
 | //         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:238:5: Error: The setter 'duplicateExtensionInstanceFieldAndSetter2' isn't defined for the class 'int'. | 
 | // Try correcting the name to the name of an existing setter, or defining a setter or field named 'duplicateExtensionInstanceFieldAndSetter2'. | 
 | //   0.duplicateExtensionInstanceFieldAndSetter2 = | 
 | //     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:257:5: Error: The setter 'extensionStaticFieldAndInstanceSetter' isn't defined for the class 'int'. | 
 | // Try correcting the name to the name of an existing setter, or defining a setter or field named 'extensionStaticFieldAndInstanceSetter'. | 
 | //   0.extensionStaticFieldAndInstanceSetter = | 
 | //     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:262:5: Error: The setter 'extensionStaticFieldAndInstanceDuplicateSetter' isn't defined for the class 'int'. | 
 | // Try correcting the name to the name of an existing setter, or defining a setter or field named 'extensionStaticFieldAndInstanceDuplicateSetter'. | 
 | //   0.extensionStaticFieldAndInstanceDuplicateSetter = | 
 | //     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:270:9: Error: The getter 'extensionInstanceFieldAndStaticSetter' isn't defined for the class 'int'. | 
 | // Try correcting the name to the name of an existing getter, or defining a getter or field named 'extensionInstanceFieldAndStaticSetter'. | 
 | //       0.extensionInstanceFieldAndStaticSetter; | 
 | //         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:269:5: Error: The setter 'extensionInstanceFieldAndStaticSetter' isn't defined for the class 'int'. | 
 | // Try correcting the name to the name of an existing setter, or defining a setter or field named 'extensionInstanceFieldAndStaticSetter'. | 
 | //   0.extensionInstanceFieldAndStaticSetter = | 
 | //     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:275:9: Error: The getter 'extensionInstanceFieldAndStaticDuplicateSetter' isn't defined for the class 'int'. | 
 | // Try correcting the name to the name of an existing getter, or defining a getter or field named 'extensionInstanceFieldAndStaticDuplicateSetter'. | 
 | //       0.extensionInstanceFieldAndStaticDuplicateSetter; | 
 | //         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:274:5: Error: The setter 'extensionInstanceFieldAndStaticDuplicateSetter' isn't defined for the class 'int'. | 
 | // Try correcting the name to the name of an existing setter, or defining a setter or field named 'extensionInstanceFieldAndStaticDuplicateSetter'. | 
 | //   0.extensionInstanceFieldAndStaticDuplicateSetter = | 
 | //     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:280:9: Error: The getter 'duplicateExtensionInstanceFieldAndStaticSetter1' isn't defined for the class 'int'. | 
 | // Try correcting the name to the name of an existing getter, or defining a getter or field named 'duplicateExtensionInstanceFieldAndStaticSetter1'. | 
 | //       0.duplicateExtensionInstanceFieldAndStaticSetter1; | 
 | //         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:279:5: Error: The setter 'duplicateExtensionInstanceFieldAndStaticSetter1' isn't defined for the class 'int'. | 
 | // Try correcting the name to the name of an existing setter, or defining a setter or field named 'duplicateExtensionInstanceFieldAndStaticSetter1'. | 
 | //   0.duplicateExtensionInstanceFieldAndStaticSetter1 = | 
 | //     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:285:9: Error: The getter 'duplicateExtensionInstanceFieldAndStaticSetter2' isn't defined for the class 'int'. | 
 | // Try correcting the name to the name of an existing getter, or defining a getter or field named 'duplicateExtensionInstanceFieldAndStaticSetter2'. | 
 | //       0.duplicateExtensionInstanceFieldAndStaticSetter2; | 
 | //         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:284:5: Error: The setter 'duplicateExtensionInstanceFieldAndStaticSetter2' isn't defined for the class 'int'. | 
 | // Try correcting the name to the name of an existing setter, or defining a setter or field named 'duplicateExtensionInstanceFieldAndStaticSetter2'. | 
 | //   0.duplicateExtensionInstanceFieldAndStaticSetter2 = | 
 | //     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:289:5: Error: The setter 'duplicateExtensionStaticFieldAndInstanceSetter1' isn't defined for the class 'int'. | 
 | // Try correcting the name to the name of an existing setter, or defining a setter or field named 'duplicateExtensionStaticFieldAndInstanceSetter1'. | 
 | //   0.duplicateExtensionStaticFieldAndInstanceSetter1 = | 
 | //     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/nnbd/field_vs_setter.dart:294:5: Error: The setter 'duplicateExtensionStaticFieldAndInstanceSetter2' isn't defined for the class 'int'. | 
 | // Try correcting the name to the name of an existing setter, or defining a setter or field named 'duplicateExtensionStaticFieldAndInstanceSetter2'. | 
 | //   0.duplicateExtensionStaticFieldAndInstanceSetter2 = | 
 | //     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
 | // | 
 | import self as self; | 
 | import "dart:core" as core; | 
 |  | 
 | class Class extends core::Object { | 
 |   field core::int? instanceFieldAndSetter = null; | 
 |   field core::int? instanceFieldAndDuplicateSetter = null; | 
 |   field core::int? duplicateInstanceFieldAndSetter1 = null; | 
 |   final field core::int? duplicateInstanceFieldAndSetter2 = null; | 
 |   late final [setter] field core::int? instanceLateFinalFieldAndSetter; | 
 |   late final [setter] field core::int? instanceLateFinalFieldAndDuplicateSetter; | 
 |   static field core::int? staticFieldAndSetter = null; | 
 |   static field core::int? staticFieldAndDuplicateSetter = null; | 
 |   static field core::int? duplicateStaticFieldAndSetter1 = null; | 
 |   static final field core::int? duplicateStaticFieldAndSetter2 = null; | 
 |   late static final [setter] field core::int? staticLateFinalFieldAndSetter; | 
 |   late static final [setter] field core::int? staticLateFinalFieldAndDuplicateSetter; | 
 |   static field core::int? staticFieldAndInstanceSetter = null; | 
 |   static field core::int? staticFieldAndInstanceDuplicateSetter = null; | 
 |   field core::int? instanceFieldAndStaticSetter = null; | 
 |   field core::int? instanceFieldAndStaticDuplicateSetter = null; | 
 |   field core::int? duplicateInstanceFieldAndStaticSetter1 = null; | 
 |   final field core::int? duplicateInstanceFieldAndStaticSetter2 = null; | 
 |   static field core::int? duplicateStaticFieldAndInstanceSetter1 = null; | 
 |   static final field core::int? duplicateStaticFieldAndInstanceSetter2 = null; | 
 |   synthetic constructor •() → self::Class | 
 |     : super core::Object::•() | 
 |     ; | 
 |   set duplicateInstanceFieldAndSetter2(core::int? value) → void {} | 
 |   static set duplicateStaticFieldAndSetter2(core::int? value) → void {} | 
 | } | 
 | extension Extension on core::int? { | 
 |   field extensionInstanceFieldAndSetter = self::Extension|extensionInstanceFieldAndSetter; | 
 |   field extensionInstanceFieldAndDuplicateSetter = self::Extension|extensionInstanceFieldAndDuplicateSetter; | 
 |   field duplicateExtensionInstanceFieldAndSetter1 = self::Extension|duplicateExtensionInstanceFieldAndSetter1; | 
 |   field duplicateExtensionInstanceFieldAndSetter2 = self::Extension|duplicateExtensionInstanceFieldAndSetter2; | 
 |   set duplicateExtensionInstanceFieldAndSetter2 = self::Extension|set#duplicateExtensionInstanceFieldAndSetter2; | 
 |   static field extensionStaticFieldAndSetter = self::Extension|extensionStaticFieldAndSetter; | 
 |   static field extensionStaticFieldAndDuplicateSetter = self::Extension|extensionStaticFieldAndDuplicateSetter; | 
 |   static field duplicateExtensionStaticFieldAndSetter1 = self::Extension|duplicateExtensionStaticFieldAndSetter1; | 
 |   static field duplicateExtensionStaticFieldAndSetter2 = self::Extension|duplicateExtensionStaticFieldAndSetter2; | 
 |   static set duplicateExtensionStaticFieldAndSetter2 = set self::Extension|duplicateExtensionStaticFieldAndSetter2; | 
 |   static field extensionStaticLateFinalFieldAndSetter = self::Extension|extensionStaticLateFinalFieldAndSetter; | 
 |   static field extensionStaticLateFinalFieldAndDuplicateSetter = self::Extension|extensionStaticLateFinalFieldAndDuplicateSetter; | 
 |   static field extensionStaticFieldAndInstanceSetter = self::Extension|extensionStaticFieldAndInstanceSetter; | 
 |   static field extensionStaticFieldAndInstanceDuplicateSetter = self::Extension|extensionStaticFieldAndInstanceDuplicateSetter; | 
 |   field extensionInstanceFieldAndStaticSetter = self::Extension|extensionInstanceFieldAndStaticSetter; | 
 |   field extensionInstanceFieldAndStaticDuplicateSetter = self::Extension|extensionInstanceFieldAndStaticDuplicateSetter; | 
 |   field duplicateExtensionInstanceFieldAndStaticSetter1 = self::Extension|duplicateExtensionInstanceFieldAndStaticSetter1; | 
 |   field duplicateExtensionInstanceFieldAndStaticSetter2 = self::Extension|duplicateExtensionInstanceFieldAndStaticSetter2; | 
 |   static field duplicateExtensionStaticFieldAndInstanceSetter1 = self::Extension|duplicateExtensionStaticFieldAndInstanceSetter1; | 
 |   static field duplicateExtensionStaticFieldAndInstanceSetter2 = self::Extension|duplicateExtensionStaticFieldAndInstanceSetter2; | 
 | } | 
 | static field core::int? topLevelFieldAndSetter; | 
 | static field core::int? topLevelFieldAndDuplicateSetter; | 
 | static field core::int? duplicateTopLevelFieldAndSetter1; | 
 | static final field core::int? duplicateTopLevelFieldAndSetter2 = null; | 
 | late static final [setter] field core::int? topLevelLateFinalFieldAndSetter; | 
 | late static final [setter] field core::int? topLevelLateFinalFieldAndDuplicateSetter; | 
 | static field core::int? Extension|extensionInstanceFieldAndSetter; | 
 | static field core::int? Extension|extensionInstanceFieldAndDuplicateSetter; | 
 | static field core::int? Extension|duplicateExtensionInstanceFieldAndSetter1; | 
 | static final field core::int? Extension|duplicateExtensionInstanceFieldAndSetter2 = null; | 
 | static field core::int? Extension|extensionStaticFieldAndSetter; | 
 | static field core::int? Extension|extensionStaticFieldAndDuplicateSetter; | 
 | static field core::int? Extension|duplicateExtensionStaticFieldAndSetter1; | 
 | static final field core::int? Extension|duplicateExtensionStaticFieldAndSetter2 = null; | 
 | late static final [setter] field core::int? Extension|extensionStaticLateFinalFieldAndSetter; | 
 | late static final [setter] field core::int? Extension|extensionStaticLateFinalFieldAndDuplicateSetter; | 
 | static field core::int? Extension|extensionStaticFieldAndInstanceSetter; | 
 | static field core::int? Extension|extensionStaticFieldAndInstanceDuplicateSetter; | 
 | static field core::int? Extension|extensionInstanceFieldAndStaticSetter; | 
 | static field core::int? Extension|extensionInstanceFieldAndStaticDuplicateSetter; | 
 | static field core::int? Extension|duplicateExtensionInstanceFieldAndStaticSetter1; | 
 | static final field core::int? Extension|duplicateExtensionInstanceFieldAndStaticSetter2 = null; | 
 | static field core::int? Extension|duplicateExtensionStaticFieldAndInstanceSetter1; | 
 | static final field core::int? Extension|duplicateExtensionStaticFieldAndInstanceSetter2 = null; | 
 | static set duplicateTopLevelFieldAndSetter2(core::int? value) → void {} | 
 | static extension-member method Extension|set#duplicateExtensionInstanceFieldAndSetter2(lowered final core::int? #this, core::int? value) → void {} | 
 | static extension-member set Extension|duplicateExtensionStaticFieldAndSetter2(core::int? value) → void {} | 
 | static method test() → dynamic { | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:173:26: Error: Can't assign to this. | 
 |   topLevelFieldAndSetter = topLevelFieldAndSetter; | 
 |                          ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:174:35: Error: Can't assign to this. | 
 |   topLevelFieldAndDuplicateSetter = topLevelFieldAndDuplicateSetter; | 
 |                                   ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:175:35: Error: Can't assign to this. | 
 |   topLevelLateFinalFieldAndSetter = topLevelLateFinalFieldAndSetter; | 
 |                                   ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:176:44: Error: Can't assign to this. | 
 |   topLevelLateFinalFieldAndDuplicateSetter = | 
 |                                            ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:178:36: Error: Can't assign to this. | 
 |   duplicateTopLevelFieldAndSetter1 = duplicateTopLevelFieldAndSetter1; | 
 |                                    ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:179:36: Error: Can't assign to this. | 
 |   duplicateTopLevelFieldAndSetter2 = duplicateTopLevelFieldAndSetter2; | 
 |                                    ^"; | 
 |   self::Class c = new self::Class::•(); | 
 |   c.{self::Class::instanceFieldAndSetter} = c.{self::Class::instanceFieldAndSetter}{core::int?}; | 
 |   c.{self::Class::instanceFieldAndDuplicateSetter} = c.{self::Class::instanceFieldAndDuplicateSetter}{core::int?}; | 
 |   c.{self::Class::instanceLateFinalFieldAndSetter} = c.{self::Class::instanceLateFinalFieldAndSetter}{core::int?}; | 
 |   c.{self::Class::instanceLateFinalFieldAndDuplicateSetter} = c.{self::Class::instanceLateFinalFieldAndDuplicateSetter}{core::int?}; | 
 |   c.{self::Class::duplicateInstanceFieldAndStaticSetter1} = c.{self::Class::duplicateInstanceFieldAndStaticSetter1}{core::int?}; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:190:5: Error: The setter 'duplicateInstanceFieldAndStaticSetter2' isn't defined for the class 'Class'. | 
 |  - 'Class' is from 'pkg/front_end/testcases/nnbd/field_vs_setter.dart'. | 
 | Try correcting the name to the name of an existing setter, or defining a setter or field named 'duplicateInstanceFieldAndStaticSetter2'. | 
 |   c.duplicateInstanceFieldAndStaticSetter2 = | 
 |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in c.{<unresolved>}duplicateInstanceFieldAndStaticSetter2 = c.{self::Class::duplicateInstanceFieldAndStaticSetter2}{core::int?}; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:193:30: Error: Can't assign to this. | 
 |   Class.staticFieldAndSetter = Class.staticFieldAndSetter; | 
 |                              ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:194:39: Error: Can't assign to this. | 
 |   Class.staticFieldAndDuplicateSetter = Class.staticFieldAndDuplicateSetter; | 
 |                                       ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:195:39: Error: Can't assign to this. | 
 |   Class.staticLateFinalFieldAndSetter = Class.staticLateFinalFieldAndSetter; | 
 |                                       ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:196:48: Error: Can't assign to this. | 
 |   Class.staticLateFinalFieldAndDuplicateSetter = | 
 |                                                ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:198:40: Error: Can't assign to this. | 
 |   Class.duplicateStaticFieldAndSetter1 = Class.duplicateStaticFieldAndSetter1; | 
 |                                        ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:199:40: Error: Can't assign to this. | 
 |   Class.duplicateStaticFieldAndSetter2 = Class.duplicateStaticFieldAndSetter2; | 
 |                                        ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:201:5: Error: The setter 'staticFieldAndInstanceSetter' isn't defined for the class 'Class'. | 
 |  - 'Class' is from 'pkg/front_end/testcases/nnbd/field_vs_setter.dart'. | 
 | Try correcting the name to the name of an existing setter, or defining a setter or field named 'staticFieldAndInstanceSetter'. | 
 |   c.staticFieldAndInstanceSetter = Class.staticFieldAndInstanceSetter; | 
 |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in c.{<unresolved>}staticFieldAndInstanceSetter = invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:201:42: Error: Can't use 'staticFieldAndInstanceSetter' because it is declared more than once. | 
 |   c.staticFieldAndInstanceSetter = Class.staticFieldAndInstanceSetter; | 
 |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:202:38: Error: Can't assign to this. | 
 |   Class.staticFieldAndInstanceSetter = Class.staticFieldAndInstanceSetter; | 
 |                                      ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:204:5: Error: The setter 'staticFieldAndInstanceDuplicateSetter' isn't defined for the class 'Class'. | 
 |  - 'Class' is from 'pkg/front_end/testcases/nnbd/field_vs_setter.dart'. | 
 | Try correcting the name to the name of an existing setter, or defining a setter or field named 'staticFieldAndInstanceDuplicateSetter'. | 
 |   c.staticFieldAndInstanceDuplicateSetter = | 
 |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in c.{<unresolved>}staticFieldAndInstanceDuplicateSetter = invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:205:13: Error: Can't use 'staticFieldAndInstanceDuplicateSetter' because it is declared more than once. | 
 |       Class.staticFieldAndInstanceDuplicateSetter; | 
 |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:206:47: Error: Can't assign to this. | 
 |   Class.staticFieldAndInstanceDuplicateSetter = | 
 |                                               ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:209:38: Error: Can't assign to this. | 
 |   Class.instanceFieldAndStaticSetter = c.instanceFieldAndStaticSetter; | 
 |                                      ^"; | 
 |   c.{self::Class::instanceFieldAndStaticSetter} = c.{self::Class::instanceFieldAndStaticSetter}{core::int?}; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:212:47: Error: Can't assign to this. | 
 |   Class.instanceFieldAndStaticDuplicateSetter = | 
 |                                               ^"; | 
 |   c.{self::Class::instanceFieldAndStaticDuplicateSetter} = c.{self::Class::instanceFieldAndStaticDuplicateSetter}{core::int?}; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:217:5: Error: The setter 'duplicateStaticFieldAndInstanceSetter1' isn't defined for the class 'Class'. | 
 |  - 'Class' is from 'pkg/front_end/testcases/nnbd/field_vs_setter.dart'. | 
 | Try correcting the name to the name of an existing setter, or defining a setter or field named 'duplicateStaticFieldAndInstanceSetter1'. | 
 |   c.duplicateStaticFieldAndInstanceSetter1 = | 
 |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in c.{<unresolved>}duplicateStaticFieldAndInstanceSetter1 = invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:218:13: Error: Can't use 'duplicateStaticFieldAndInstanceSetter1' because it is declared more than once. | 
 |       Class.duplicateStaticFieldAndInstanceSetter1; | 
 |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:219:48: Error: Can't assign to this. | 
 |   Class.duplicateStaticFieldAndInstanceSetter1 = | 
 |                                                ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:222:5: Error: The setter 'duplicateStaticFieldAndInstanceSetter2' isn't defined for the class 'Class'. | 
 |  - 'Class' is from 'pkg/front_end/testcases/nnbd/field_vs_setter.dart'. | 
 | Try correcting the name to the name of an existing setter, or defining a setter or field named 'duplicateStaticFieldAndInstanceSetter2'. | 
 |   c.duplicateStaticFieldAndInstanceSetter2 = | 
 |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in c.{<unresolved>}duplicateStaticFieldAndInstanceSetter2 = invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:223:13: Error: Can't use 'duplicateStaticFieldAndInstanceSetter2' because it is declared more than once. | 
 |       Class.duplicateStaticFieldAndInstanceSetter2; | 
 |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:224:48: Error: Can't assign to this. | 
 |   Class.duplicateStaticFieldAndInstanceSetter2 = | 
 |                                                ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:227:48: Error: Can't assign to this. | 
 |   Class.duplicateInstanceFieldAndStaticSetter1 = | 
 |                                                ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:229:48: Error: Can't assign to this. | 
 |   Class.duplicateInstanceFieldAndStaticSetter2 = | 
 |                                                ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:232:5: Error: The setter 'extensionInstanceFieldAndSetter' isn't defined for the class 'int'. | 
 | Try correcting the name to the name of an existing setter, or defining a setter or field named 'extensionInstanceFieldAndSetter'. | 
 |   0.extensionInstanceFieldAndSetter = 0.extensionInstanceFieldAndSetter; | 
 |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in 0.{<unresolved>}extensionInstanceFieldAndSetter = invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:232:41: Error: The getter 'extensionInstanceFieldAndSetter' isn't defined for the class 'int'. | 
 | Try correcting the name to the name of an existing getter, or defining a getter or field named 'extensionInstanceFieldAndSetter'. | 
 |   0.extensionInstanceFieldAndSetter = 0.extensionInstanceFieldAndSetter; | 
 |                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in 0{<unresolved>}.extensionInstanceFieldAndSetter; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:233:5: Error: The setter 'extensionInstanceFieldAndDuplicateSetter' isn't defined for the class 'int'. | 
 | Try correcting the name to the name of an existing setter, or defining a setter or field named 'extensionInstanceFieldAndDuplicateSetter'. | 
 |   0.extensionInstanceFieldAndDuplicateSetter = | 
 |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in 0.{<unresolved>}extensionInstanceFieldAndDuplicateSetter = invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:234:9: Error: The getter 'extensionInstanceFieldAndDuplicateSetter' isn't defined for the class 'int'. | 
 | Try correcting the name to the name of an existing getter, or defining a getter or field named 'extensionInstanceFieldAndDuplicateSetter'. | 
 |       0.extensionInstanceFieldAndDuplicateSetter; | 
 |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in 0{<unresolved>}.extensionInstanceFieldAndDuplicateSetter; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:236:5: Error: The setter 'duplicateExtensionInstanceFieldAndSetter1' isn't defined for the class 'int'. | 
 | Try correcting the name to the name of an existing setter, or defining a setter or field named 'duplicateExtensionInstanceFieldAndSetter1'. | 
 |   0.duplicateExtensionInstanceFieldAndSetter1 = | 
 |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in 0.{<unresolved>}duplicateExtensionInstanceFieldAndSetter1 = invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:237:9: Error: The getter 'duplicateExtensionInstanceFieldAndSetter1' isn't defined for the class 'int'. | 
 | Try correcting the name to the name of an existing getter, or defining a getter or field named 'duplicateExtensionInstanceFieldAndSetter1'. | 
 |       0.duplicateExtensionInstanceFieldAndSetter1; | 
 |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in 0{<unresolved>}.duplicateExtensionInstanceFieldAndSetter1; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:238:5: Error: The setter 'duplicateExtensionInstanceFieldAndSetter2' isn't defined for the class 'int'. | 
 | Try correcting the name to the name of an existing setter, or defining a setter or field named 'duplicateExtensionInstanceFieldAndSetter2'. | 
 |   0.duplicateExtensionInstanceFieldAndSetter2 = | 
 |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in 0.{<unresolved>}duplicateExtensionInstanceFieldAndSetter2 = invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:239:9: Error: The getter 'duplicateExtensionInstanceFieldAndSetter2' isn't defined for the class 'int'. | 
 | Try correcting the name to the name of an existing getter, or defining a getter or field named 'duplicateExtensionInstanceFieldAndSetter2'. | 
 |       0.duplicateExtensionInstanceFieldAndSetter2; | 
 |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in 0{<unresolved>}.duplicateExtensionInstanceFieldAndSetter2; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:241:43: Error: Can't assign to this. | 
 |   Extension.extensionStaticFieldAndSetter = | 
 |                                           ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:244:52: Error: Can't assign to this. | 
 |   Extension.extensionStaticFieldAndDuplicateSetter = | 
 |                                                    ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:247:52: Error: Can't assign to this. | 
 |   Extension.extensionStaticLateFinalFieldAndSetter = | 
 |                                                    ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:250:61: Error: Can't assign to this. | 
 |   Extension.extensionStaticLateFinalFieldAndDuplicateSetter = | 
 |                                                             ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:252:53: Error: Can't assign to this. | 
 |   Extension.duplicateExtensionStaticFieldAndSetter1 = | 
 |                                                     ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:254:53: Error: Can't assign to this. | 
 |   Extension.duplicateExtensionStaticFieldAndSetter2 = | 
 |                                                     ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:257:5: Error: The setter 'extensionStaticFieldAndInstanceSetter' isn't defined for the class 'int'. | 
 | Try correcting the name to the name of an existing setter, or defining a setter or field named 'extensionStaticFieldAndInstanceSetter'. | 
 |   0.extensionStaticFieldAndInstanceSetter = | 
 |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in 0.{<unresolved>}extensionStaticFieldAndInstanceSetter = invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:258:17: Error: Can't use 'extensionStaticFieldAndInstanceSetter' because it is declared more than once. | 
 |       Extension.extensionStaticFieldAndInstanceSetter; | 
 |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:259:51: Error: Can't assign to this. | 
 |   Extension.extensionStaticFieldAndInstanceSetter = | 
 |                                                   ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:262:5: Error: The setter 'extensionStaticFieldAndInstanceDuplicateSetter' isn't defined for the class 'int'. | 
 | Try correcting the name to the name of an existing setter, or defining a setter or field named 'extensionStaticFieldAndInstanceDuplicateSetter'. | 
 |   0.extensionStaticFieldAndInstanceDuplicateSetter = | 
 |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in 0.{<unresolved>}extensionStaticFieldAndInstanceDuplicateSetter = invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:263:17: Error: Can't use 'extensionStaticFieldAndInstanceDuplicateSetter' because it is declared more than once. | 
 |       Extension.extensionStaticFieldAndInstanceDuplicateSetter; | 
 |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:264:60: Error: Can't assign to this. | 
 |   Extension.extensionStaticFieldAndInstanceDuplicateSetter = | 
 |                                                            ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:267:51: Error: Can't assign to this. | 
 |   Extension.extensionInstanceFieldAndStaticSetter = | 
 |                                                   ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:269:5: Error: The setter 'extensionInstanceFieldAndStaticSetter' isn't defined for the class 'int'. | 
 | Try correcting the name to the name of an existing setter, or defining a setter or field named 'extensionInstanceFieldAndStaticSetter'. | 
 |   0.extensionInstanceFieldAndStaticSetter = | 
 |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in 0.{<unresolved>}extensionInstanceFieldAndStaticSetter = invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:270:9: Error: The getter 'extensionInstanceFieldAndStaticSetter' isn't defined for the class 'int'. | 
 | Try correcting the name to the name of an existing getter, or defining a getter or field named 'extensionInstanceFieldAndStaticSetter'. | 
 |       0.extensionInstanceFieldAndStaticSetter; | 
 |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in 0{<unresolved>}.extensionInstanceFieldAndStaticSetter; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:272:60: Error: Can't assign to this. | 
 |   Extension.extensionInstanceFieldAndStaticDuplicateSetter = | 
 |                                                            ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:274:5: Error: The setter 'extensionInstanceFieldAndStaticDuplicateSetter' isn't defined for the class 'int'. | 
 | Try correcting the name to the name of an existing setter, or defining a setter or field named 'extensionInstanceFieldAndStaticDuplicateSetter'. | 
 |   0.extensionInstanceFieldAndStaticDuplicateSetter = | 
 |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in 0.{<unresolved>}extensionInstanceFieldAndStaticDuplicateSetter = invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:275:9: Error: The getter 'extensionInstanceFieldAndStaticDuplicateSetter' isn't defined for the class 'int'. | 
 | Try correcting the name to the name of an existing getter, or defining a getter or field named 'extensionInstanceFieldAndStaticDuplicateSetter'. | 
 |       0.extensionInstanceFieldAndStaticDuplicateSetter; | 
 |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in 0{<unresolved>}.extensionInstanceFieldAndStaticDuplicateSetter; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:277:61: Error: Can't assign to this. | 
 |   Extension.duplicateExtensionInstanceFieldAndStaticSetter1 = | 
 |                                                             ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:279:5: Error: The setter 'duplicateExtensionInstanceFieldAndStaticSetter1' isn't defined for the class 'int'. | 
 | Try correcting the name to the name of an existing setter, or defining a setter or field named 'duplicateExtensionInstanceFieldAndStaticSetter1'. | 
 |   0.duplicateExtensionInstanceFieldAndStaticSetter1 = | 
 |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in 0.{<unresolved>}duplicateExtensionInstanceFieldAndStaticSetter1 = invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:280:9: Error: The getter 'duplicateExtensionInstanceFieldAndStaticSetter1' isn't defined for the class 'int'. | 
 | Try correcting the name to the name of an existing getter, or defining a getter or field named 'duplicateExtensionInstanceFieldAndStaticSetter1'. | 
 |       0.duplicateExtensionInstanceFieldAndStaticSetter1; | 
 |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in 0{<unresolved>}.duplicateExtensionInstanceFieldAndStaticSetter1; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:282:61: Error: Can't assign to this. | 
 |   Extension.duplicateExtensionInstanceFieldAndStaticSetter2 = | 
 |                                                             ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:284:5: Error: The setter 'duplicateExtensionInstanceFieldAndStaticSetter2' isn't defined for the class 'int'. | 
 | Try correcting the name to the name of an existing setter, or defining a setter or field named 'duplicateExtensionInstanceFieldAndStaticSetter2'. | 
 |   0.duplicateExtensionInstanceFieldAndStaticSetter2 = | 
 |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in 0.{<unresolved>}duplicateExtensionInstanceFieldAndStaticSetter2 = invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:285:9: Error: The getter 'duplicateExtensionInstanceFieldAndStaticSetter2' isn't defined for the class 'int'. | 
 | Try correcting the name to the name of an existing getter, or defining a getter or field named 'duplicateExtensionInstanceFieldAndStaticSetter2'. | 
 |       0.duplicateExtensionInstanceFieldAndStaticSetter2; | 
 |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in 0{<unresolved>}.duplicateExtensionInstanceFieldAndStaticSetter2; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:287:61: Error: Can't assign to this. | 
 |   Extension.duplicateExtensionStaticFieldAndInstanceSetter1 = | 
 |                                                             ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:289:5: Error: The setter 'duplicateExtensionStaticFieldAndInstanceSetter1' isn't defined for the class 'int'. | 
 | Try correcting the name to the name of an existing setter, or defining a setter or field named 'duplicateExtensionStaticFieldAndInstanceSetter1'. | 
 |   0.duplicateExtensionStaticFieldAndInstanceSetter1 = | 
 |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in 0.{<unresolved>}duplicateExtensionStaticFieldAndInstanceSetter1 = invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:290:17: Error: Can't use 'duplicateExtensionStaticFieldAndInstanceSetter1' because it is declared more than once. | 
 |       Extension.duplicateExtensionStaticFieldAndInstanceSetter1; | 
 |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:292:61: Error: Can't assign to this. | 
 |   Extension.duplicateExtensionStaticFieldAndInstanceSetter2 = | 
 |                                                             ^"; | 
 |   invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:294:5: Error: The setter 'duplicateExtensionStaticFieldAndInstanceSetter2' isn't defined for the class 'int'. | 
 | Try correcting the name to the name of an existing setter, or defining a setter or field named 'duplicateExtensionStaticFieldAndInstanceSetter2'. | 
 |   0.duplicateExtensionStaticFieldAndInstanceSetter2 = | 
 |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^" in 0.{<unresolved>}duplicateExtensionStaticFieldAndInstanceSetter2 = invalid-expression "pkg/front_end/testcases/nnbd/field_vs_setter.dart:295:17: Error: Can't use 'duplicateExtensionStaticFieldAndInstanceSetter2' because it is declared more than once. | 
 |       Extension.duplicateExtensionStaticFieldAndInstanceSetter2; | 
 |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^"; | 
 | } | 
 | static method main() → dynamic {} |