Avoid crash for type variables in mixed in fields.

tests/language/language_dart2js.status

Index: tests/language/language_dart2js.status
diff --git a/tests/language/language_dart2js.status b/tests/language/language_dart2js.status
index cddd3c34bb19bf585bcdf4e8d1c2d7281dada04b..4c9cb464f4258db5c18dab67d23e47b43c24d938 100644
--- a/tests/language/language_dart2js.status
+++ b/tests/language/language_dart2js.status
@@ -117,6 +117,8 @@ mixin_super_2_test: CompileTimeError # Issue 23773
 mixin_super_bound2_test: CompileTimeError # Issue 23773
 mixin_super_use_test: CompileTimeError # Issue 23773
 mixin_superclass_test: CompileTimeError # Issue 23773
+closure_in_field_test/01: RuntimeError # Issue 30467
+closure_in_field_test/02: RuntimeError # Issue 30467
 
 ref_before_declaration_test/00: MissingCompileTimeError
 ref_before_declaration_test/01: MissingCompileTimeError
@@ -579,6 +581,8 @@ cha_deopt3_test: CompileTimeError
 check_member_static_test/02: MissingCompileTimeError
 class_cycle_test/02: MissingCompileTimeError
 class_cycle_test/03: MissingCompileTimeError
+closure_in_field_test/01: Crash
+closure_in_field_test/02: Crash
 compile_time_constant_a_test: Crash
 compile_time_constant_b_test: Crash
 compile_time_constant_c_test/02: Crash
@@ -1605,6 +1609,8 @@ cha_deopt3_test: CompileTimeError
 check_member_static_test/02: MissingCompileTimeError
 class_cycle_test/02: MissingCompileTimeError
 class_cycle_test/03: MissingCompileTimeError
+closure_in_field_test/01: Crash
+closure_in_field_test/02: Crash
 compile_time_constant_a_test: Crash
 compile_time_constant_b_test: Crash
 compile_time_constant_c_test/02: Crash