Fix for invalid 'extends/implements/with SomeEnum'.

pkg/analyzer/test/src/summary/resynthesize_common.dart

Index: pkg/analyzer/test/src/summary/resynthesize_common.dart
diff --git a/pkg/analyzer/test/src/summary/resynthesize_common.dart b/pkg/analyzer/test/src/summary/resynthesize_common.dart
index 3d8874ce60ffddf97f776c353aef330523d41b43..2ffd0586d88a28046558a3f226e016b9ac73b143 100644
--- a/pkg/analyzer/test/src/summary/resynthesize_common.dart
+++ b/pkg/analyzer/test/src/summary/resynthesize_common.dart
@@ -2922,6 +2922,28 @@ enum E {
     checkLibrary('enum E1 { v1 } enum E2 { v2 }');
   }
 
+  test_error_extendsEnum() {
+    checkLibrary('''
+enum E {a, b, c}
+
+class M {}
+
+class A extends E {
+  foo() {}
+}
+
+class B implements E, M {
+  foo() {}
+}
+
+class C extends Object with E, M {
+  foo() {}
+}
+
+class D = Object with M, E;
+''');
+  }
+
   test_executable_parameter_type_typedef() {
     checkLibrary(r'''
 typedef F(int p);