[tests] Update tests where analyzer mixin applications were failing.

Bug: https://github.com/dart-lang/sdk/issues/51808
Change-Id: I0c3951ab28f96cf1794e0ac1088c975c11935bf7
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/290660
Commit-Queue: Kallen Tu <kallentu@google.com>
Reviewed-by: Leaf Petersen <leafp@google.com>
diff --git a/tests/language/class_modifiers/base_transitivity/base_class_different_library_error_test.dart b/tests/language/class_modifiers/base_transitivity/base_class_different_library_error_test.dart
index c227fb5..9360566 100644
--- a/tests/language/class_modifiers/base_transitivity/base_class_different_library_error_test.dart
+++ b/tests/language/class_modifiers/base_transitivity/base_class_different_library_error_test.dart
@@ -104,14 +104,14 @@
 
 // Extending via an anonymous mixin application class.
 class SimpleExtendApplication = BaseClass with _MixinOnObject;
-//    ^
+//    ^^^^^^^^^^^^^^^^^^^^^^^
+// [analyzer] COMPILE_TIME_ERROR.SUBTYPE_OF_BASE_OR_FINAL_IS_NOT_BASE_FINAL_OR_SEALED
 // [cfe] The type 'SimpleExtendApplication' must be 'base', 'final' or 'sealed' because the supertype 'BaseClass' is 'base'.
-// [analyzer] unspecified
 
 interface class InterfaceExtendApplication = BaseClass with _MixinOnObject;
-//              ^
+//              ^^^^^^^^^^^^^^^^^^^^^^^^^^
+// [analyzer] COMPILE_TIME_ERROR.SUBTYPE_OF_BASE_OR_FINAL_IS_NOT_BASE_FINAL_OR_SEALED
 // [cfe] The type 'InterfaceExtendApplication' must be 'base', 'final' or 'sealed' because the supertype 'BaseClass' is 'base'.
-// [analyzer] unspecified
 
 /// It is an error if BaseClass is implemented by something which is not base,
 /// final or sealed.
@@ -164,7 +164,8 @@
 
 // Implementing with a mixin application class.
 class SimpleImplementApplication = Object
-//    ^
+//    ^^^^^^^^^^^^^^^^^^^^^^^^^^
+// [analyzer] COMPILE_TIME_ERROR.SUBTYPE_OF_BASE_OR_FINAL_IS_NOT_BASE_FINAL_OR_SEALED
 // [cfe] The type 'SimpleImplementApplication' must be 'base', 'final' or 'sealed' because the supertype 'BaseClass' is 'base'.
     with
         _MixinOnObject
@@ -182,7 +183,8 @@
 // [cfe] The class 'BaseClass' can't be implemented outside of its library because it's a base class.
 
 interface class InterfaceImplementApplication = Object
-//              ^
+//              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+// [analyzer] COMPILE_TIME_ERROR.SUBTYPE_OF_BASE_OR_FINAL_IS_NOT_BASE_FINAL_OR_SEALED
 // [cfe] The type 'InterfaceImplementApplication' must be 'base', 'final' or 'sealed' because the supertype 'BaseClass' is 'base'.
     with
         _MixinOnObject
diff --git a/tests/language/class_modifiers/base_transitivity/base_class_same_library_error_test.dart b/tests/language/class_modifiers/base_transitivity/base_class_same_library_error_test.dart
index 832a638..abeb93c 100644
--- a/tests/language/class_modifiers/base_transitivity/base_class_same_library_error_test.dart
+++ b/tests/language/class_modifiers/base_transitivity/base_class_same_library_error_test.dart
@@ -52,7 +52,7 @@
 // [cfe] The type 'InterfaceSealedExtendImplement' must be 'base', 'final' or 'sealed' because the supertype 'BaseClass' is 'base'.
 
 mixin class MixinClassSealedExtendImplement implements SealedExtend {}
-//          ^^^^^^^^^^^^^^^^^^^^^^^^^^
+//          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 // [analyzer] COMPILE_TIME_ERROR.SUBTYPE_OF_BASE_OR_FINAL_IS_NOT_BASE_FINAL_OR_SEALED
 // [cfe] The type 'MixinClassSealedExtendImplement' must be 'base', 'final' or 'sealed' because the supertype 'BaseClass' is 'base'.
 
@@ -65,7 +65,6 @@
 mixin MixinSealedExtendOn on SealedExtend {}
 //    ^^^^^^^^^^^^^^^^^^^
 // [analyzer] COMPILE_TIME_ERROR.SUBTYPE_OF_BASE_OR_FINAL_IS_NOT_BASE_FINAL_OR_SEALED
-//    ^
 // [cfe] The type 'MixinSealedExtendOn' must be 'base', 'final' or 'sealed' because the supertype 'BaseClass' is 'base'.
 
 // Extending via an anonymous mixin class.
@@ -81,13 +80,13 @@
 
 // Extending via an anonymous mixin application class.
 class SimpleExtendApplication = BaseClass with _MixinOnObject;
-//    ^
+//    ^^^^^^^^^^^^^^^^^^^^^^^
+// [analyzer] COMPILE_TIME_ERROR.SUBTYPE_OF_BASE_OR_FINAL_IS_NOT_BASE_FINAL_OR_SEALED
 // [cfe] The type 'SimpleExtendApplication' must be 'base', 'final' or 'sealed' because the supertype 'BaseClass' is 'base'.
-// [analyzer] unspecified
 interface class InterfaceExtendApplication = BaseClass with _MixinOnObject;
-//              ^
+//              ^^^^^^^^^^^^^^^^^^^^^^^^^^
+// [analyzer] COMPILE_TIME_ERROR.SUBTYPE_OF_BASE_OR_FINAL_IS_NOT_BASE_FINAL_OR_SEALED
 // [cfe] The type 'InterfaceExtendApplication' must be 'base', 'final' or 'sealed' because the supertype 'BaseClass' is 'base'.
-// [analyzer] unspecified
 
 /// It is an error if BaseClass is implemented by something which is not base,
 /// final or sealed.
@@ -154,16 +153,17 @@
 
 // Implementing with a mixin application class.
 interface class InterfaceImplementApplication = Object
-//              ^
+//              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+// [analyzer] COMPILE_TIME_ERROR.SUBTYPE_OF_BASE_OR_FINAL_IS_NOT_BASE_FINAL_OR_SEALED
 // [cfe] The type 'InterfaceImplementApplication' must be 'base', 'final' or 'sealed' because the supertype 'BaseClass' is 'base'.
     with
         _MixinOnObject
     implements
         BaseClass;
 class SimpleImplementApplication = Object
-//    ^
+//    ^^^^^^^^^^^^^^^^^^^^^^^^^^
+// [analyzer] COMPILE_TIME_ERROR.SUBTYPE_OF_BASE_OR_FINAL_IS_NOT_BASE_FINAL_OR_SEALED
 // [cfe] The type 'SimpleImplementApplication' must be 'base', 'final' or 'sealed' because the supertype 'BaseClass' is 'base'.
-// [analyzer] unspecified
     with
         _MixinOnObject
     implements
diff --git a/tests/language/class_modifiers/base_transitivity/final_class_same_library_error_test.dart b/tests/language/class_modifiers/base_transitivity/final_class_same_library_error_test.dart
index aab78e6..5e3a1df 100644
--- a/tests/language/class_modifiers/base_transitivity/final_class_same_library_error_test.dart
+++ b/tests/language/class_modifiers/base_transitivity/final_class_same_library_error_test.dart
@@ -80,14 +80,14 @@
 
 // Extending via an anonymous mixin application class.
 class SimpleExtendApplication = FinalClass with _MixinOnObject;
-//    ^
+//    ^^^^^^^^^^^^^^^^^^^^^^^
+// [analyzer] COMPILE_TIME_ERROR.SUBTYPE_OF_BASE_OR_FINAL_IS_NOT_BASE_FINAL_OR_SEALED
 // [cfe] The type 'SimpleExtendApplication' must be 'base', 'final' or 'sealed' because the supertype 'FinalClass' is 'final'.
-// [analyzer] unspecified
 
 interface class InterfaceExtendApplication = FinalClass with _MixinOnObject;
-//              ^
+//              ^^^^^^^^^^^^^^^^^^^^^^^^^^
+// [analyzer] COMPILE_TIME_ERROR.SUBTYPE_OF_BASE_OR_FINAL_IS_NOT_BASE_FINAL_OR_SEALED
 // [cfe] The type 'InterfaceExtendApplication' must be 'base', 'final' or 'sealed' because the supertype 'FinalClass' is 'final'.
-// [analyzer] unspecified
 
 /// It is an error if FinalClass is implemented by something which is not base,
 /// final or sealed.
@@ -154,17 +154,17 @@
 
 // Implementing with a mixin application class.
 interface class InterfaceImplementApplication = Object
-//              ^
+//              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+// [analyzer] COMPILE_TIME_ERROR.SUBTYPE_OF_BASE_OR_FINAL_IS_NOT_BASE_FINAL_OR_SEALED
 // [cfe] The type 'InterfaceImplementApplication' must be 'base', 'final' or 'sealed' because the supertype 'FinalClass' is 'final'.
-// [analyzer] unspecified
     with
         _MixinOnObject
     implements
         FinalClass;
 class SimpleImplementApplication = Object
-//    ^
+//    ^^^^^^^^^^^^^^^^^^^^^^^^^^
+// [analyzer] COMPILE_TIME_ERROR.SUBTYPE_OF_BASE_OR_FINAL_IS_NOT_BASE_FINAL_OR_SEALED
 // [cfe] The type 'SimpleImplementApplication' must be 'base', 'final' or 'sealed' because the supertype 'FinalClass' is 'final'.
-// [analyzer] unspecified
     with
         _MixinOnObject
     implements