Add assert-in-initializer-list to formal specification.

tests/language/language_analyzer2.status

Index: tests/language/language_analyzer2.status
diff --git a/tests/language/language_analyzer2.status b/tests/language/language_analyzer2.status
index 190e8fe883063ef52542e271696e4ef47a284d39..745f348ab0d063c286d56dabacb9840be10ede4a 100644
--- a/tests/language/language_analyzer2.status
+++ b/tests/language/language_analyzer2.status
@@ -3,6 +3,9 @@
 # BSD-style license that can be found in the LICENSE file.
 
 [ $compiler == dart2analyzer ]
+assertion_initializer_test/none: CompileTimeError
+assertion_initializer_test/bc01: CompileTimeError
+assertion_initializer_test/tc: CompileTimeError
 generic_methods_generic_function_parameter_test: CompileTimeError # Issue 28515
 generic_local_functions_test: CompileTimeError # Issue 28515
 
@@ -449,6 +452,11 @@ regress_27572_test: StaticWarning # Warning about undefined method expected.
 
 part_refers_to_core_library_test/01: MissingCompileTimeError # Issue 29709
 
+[ $compiler == dart2analyzer && !$checked ]
+assertion_initializer_test: CompileTimeError
+assertion_initializer_const_error2_test/none: CompileTimeError
+assertion_initializer_const_function_test/01: CompileTimeError
+
 [ $compiler == dart2analyzer && $builder_tag == strong ]
 *: Skip # Issue 28649