[PrimaryConstructors] Update test expectations

This updates the test expectations for the CFE.

Part of #61700

Change-Id: Iad25b48ab10809c95e2489821b318c6435f96ec0
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/485800
Reviewed-by: Kallen Tu <kallentu@google.com>
Commit-Queue: Johnni Winther <johnniwinther@google.com>

tests/language/private_named_parameters/declaring_parameter_collision_error_test.dart

@@ -16,64 +16,65 @@ class C1({required final String _foo}) {
   final String _foo;
   //           ^^^^
   // [analyzer] unspecified
-  // [cfe] unspecified
+  // [cfe] '_foo' is already declared in this scope.
 }
 
 /// Collide with previous private declaring parameter.
 class C2({required final String _foo, required final String _foo}) {}
 //                                                          ^^^^
 // [analyzer] unspecified
-// [cfe] unspecified
+// [cfe] '_foo' is already declared in this scope.
+// [cfe] Duplicated parameter name '_foo'.
 
 /// Collide with previous public declaring parameter.
 class C3({required final String foo, required final String _foo}) {}
 //                                                         ^^^^
 // [analyzer] COMPILE_TIME_ERROR.PRIVATE_NAMED_PARAMETER_DUPLICATE_PUBLIC_NAME
-// [cfe] unspecified
+// [cfe] The corresponding public name 'foo' is already the name of another parameter.
 
 /// Collide with previous private named parameter.
 class C4({String? _foo, required final String _foo}) {}
 //                ^^^^
 // [analyzer] SYNTACTIC_ERROR.PRIVATE_NAMED_NON_FIELD_PARAMETER
-// [cfe] unspecified
+// [cfe] A named parameter that doesn't refer to an instance variable can't start with an underscore ('_').
 //                                            ^^^^
 // [analyzer] COMPILE_TIME_ERROR.DUPLICATE_DEFINITION
-// [cfe] unspecified
+// [cfe] Duplicated parameter name '_foo'.
 
 /// Collide with previous public named parameter.
 class C5({String? foo, required final String _foo}) {}
 //                                           ^^^^
 // [analyzer] COMPILE_TIME_ERROR.PRIVATE_NAMED_PARAMETER_DUPLICATE_PUBLIC_NAME
-// [cfe] unspecified
+// [cfe] The corresponding public name 'foo' is already the name of another parameter.
 
 /// Collide with previous private positional parameter.
 class C6(String _foo, {required final String _foo}) {}
 //                                           ^^^^
 // [analyzer] COMPILE_TIME_ERROR.DUPLICATE_DEFINITION
-// [cfe] unspecified
+// [cfe] Duplicated parameter name '_foo'.
 
 /// Collide with previous public positional parameter.
 class C7(String? foo, {required final String _foo}) {}
 //                                           ^^^^
 // [analyzer] COMPILE_TIME_ERROR.PRIVATE_NAMED_PARAMETER_DUPLICATE_PUBLIC_NAME
-// [cfe] unspecified
+// [cfe] The corresponding public name 'foo' is already the name of another parameter.
 
 /// Collide with previous private initializing formal.
 class C8(this._foo, {required final String _foo}) {
   //                                       ^^^^
   // [analyzer] COMPILE_TIME_ERROR.DUPLICATE_DEFINITION
-  // [cfe] unspecified
+  // [cfe] Duplicated parameter name '_foo'.
   final String _foo;
   //           ^^^^
   // [analyzer] COMPILE_TIME_ERROR.DUPLICATE_DEFINITION
-  // [cfe] unspecified
+  // [cfe] '_foo' is already declared in this scope.
 }
 
 /// Collide with previous public initializing formal.
 class C9(this.foo, {required final String _foo}) {
   //                                      ^^^^
   // [analyzer] COMPILE_TIME_ERROR.PRIVATE_NAMED_PARAMETER_DUPLICATE_PUBLIC_NAME
-  // [cfe] unspecified
+  // [cfe] The corresponding public name 'foo' is already the name of another parameter.
   final String foo;
 }
 
@@ -81,32 +82,32 @@ class C9(this.foo, {required final String _foo}) {
 class C10({required final String _foo, String? _foo}) {}
 //                                             ^^^^
 // [analyzer] COMPILE_TIME_ERROR.DUPLICATE_DEFINITION
-//                                             ^^^^
 // [analyzer] SYNTACTIC_ERROR.PRIVATE_NAMED_NON_FIELD_PARAMETER
-// [cfe] unspecified
+// [cfe] A named parameter that doesn't refer to an instance variable can't start with an underscore ('_').
+// [cfe] Duplicated parameter name '_foo'.
 
 /// Collide with later public named parameter.
 class C11({required final String _foo, String? foo}) {}
 //                               ^^^^
 // [analyzer] COMPILE_TIME_ERROR.PRIVATE_NAMED_PARAMETER_DUPLICATE_PUBLIC_NAME
-// [cfe] unspecified
+// [cfe] The corresponding public name 'foo' is already the name of another parameter.
 
 /// Collide with later private initializing formal.
 class C12({required final String _foo, required this._foo}) {
   //                                                 ^^^^
   // [analyzer] COMPILE_TIME_ERROR.DUPLICATE_DEFINITION
-  // [cfe] unspecified
+  // [cfe] Duplicated parameter name '_foo'.
   final String _foo;
   //           ^^^^
   // [analyzer] COMPILE_TIME_ERROR.DUPLICATE_DEFINITION
-  // [cfe] unspecified
+  // [cfe] '_foo' is already declared in this scope.
 }
 
 /// Collide with later public initializing formal.
 class C13({required final String _foo, required this.foo}) {
   //                             ^^^^
   // [analyzer] COMPILE_TIME_ERROR.PRIVATE_NAMED_PARAMETER_DUPLICATE_PUBLIC_NAME
-  // [cfe] unspecified
+  // [cfe] The corresponding public name 'foo' is already the name of another parameter.
   final String foo;
 }