Report when members indirectly inherited through a mixin are not implemented (issue 26411)

pkg/analyzer/test/generated/static_warning_code_test.dart

Index: pkg/analyzer/test/generated/static_warning_code_test.dart
diff --git a/pkg/analyzer/test/generated/static_warning_code_test.dart b/pkg/analyzer/test/generated/static_warning_code_test.dart
index f8fc40d9a8723cf3d6f8f69d3db2a6a51a691d5f..9eb44ab0c7b9dbc7f62539ac8c075e724eb0c5cb 100644
--- a/pkg/analyzer/test/generated/static_warning_code_test.dart
+++ b/pkg/analyzer/test/generated/static_warning_code_test.dart
@@ -4,6 +4,7 @@
 
 library analyzer.test.generated.static_warning_code_test;
 
+import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/source_io.dart';
 import 'package:unittest/unittest.dart';
@@ -2862,6 +2863,23 @@ class C implements I {
     verify([source]);
   }
 
+  void
+      test_nonAbstractClassInheritsAbstractMemberTwo_variable_fromMixin_missingBoth() {
+    // 26411
+    resetWithOptions(new AnalysisOptionsImpl()..enableSuperMixins = true);
+    Source source = addSource(r'''
+class A {
+  int f;
+}
+class B extends A {}
+class C extends Object with B {}
+''');
+    computeLibrarySourceErrors(source);
+    assertErrors(source,
+        [StaticWarningCode.NON_ABSTRACT_CLASS_INHERITS_ABSTRACT_MEMBER_TWO]);
+    verify([source]);
+  }
+
   void test_nonTypeInCatchClause_noElement() {
     Source source = addSource(r'''
 f() {