Fix for computing overridden/implemented members from interfaces.

pkg/analysis_server/test/analysis/notification_overrides_test.dart

Index: pkg/analysis_server/test/analysis/notification_overrides_test.dart
diff --git a/pkg/analysis_server/test/analysis/notification_overrides_test.dart b/pkg/analysis_server/test/analysis/notification_overrides_test.dart
index 7875504b8c56d8e67ea02abcb6b128496e21c852..17a1e49732c93b74f27173856191b524c141cadb 100644
--- a/pkg/analysis_server/test/analysis/notification_overrides_test.dart
+++ b/pkg/analysis_server/test/analysis/notification_overrides_test.dart
@@ -138,6 +138,40 @@ class B implements A {
     });
   }
 
+  test_definedInInterface_ofInterface() {
+    addTestFile('''
+class A {
+  m() {} // in A
+}
+class B implements A {}
+class C implements B {
+  m() {} // in C
+}
+''');
+    return prepareOverrides().then((_) {
+      assertHasOverride('m() {} // in C');
+      assertNoSuperMember();
+      assertHasInterfaceMember('m() {} // in A');
+    });
+  }
+
+  test_definedInInterface_ofSuper() {
+    addTestFile('''
+class A {
+  m() {} // in A
+}
+class B implements A {}
+class C extends B {
+  m() {} // in C
+}
+''');
+    return prepareOverrides().then((_) {
+      assertHasOverride('m() {} // in C');
+      assertNoSuperMember();
+      assertHasInterfaceMember('m() {} // in A');
+    });
+  }
+
   test_interface_method_direct_multiple() {
     addTestFile('''
 class IA {
@@ -323,6 +357,20 @@ class C extends B {
     });
   }
 
+  test_super_method_superTypeCycle() {
+    addTestFile('''
+class A extends B {
+  m() {} // in A
+}
+class B extends A {
+  m() {} // in B
+}
+''');
+    return prepareOverrides().then((_) {
+      // must finish
+    });
+  }
+
   test_super_setterBySetter() {
     addTestFile('''
 class A {