More fixes in async machinery (issue 22438 and maybe more).

tests/language/language_analyzer2.status

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 [ $compiler == dart2analyzer ]
 
 # Runtime negative test. No static errors or warnings.
 closure_call_wrong_argument_count_negative_test: skip
 
 enum_syntax_test/02: Fail # 21649
@@ skipping 121 matching lines @@
 
 # test issue 14021, it is warning, not an error to reference private (undefined) identifier
 private_member1_negative_test: fail
 private_member2_negative_test: fail
 private_member3_negative_test: fail
 
 # test issue 14079
 malformed_test/none: fail # test issue 14079, legit warnings for malformed type
 malformed_test/05: fail # test issue 14079, it is not error, but warning to instantiate malformed type
 malformed_test/06: fail # test issue 14079, it is not error, but warning to use malformed type in "try-on" clause
+regress_22438_test: fail # test issue 14079, it is not error, but warning to use malformed type in "try-on" clause
 
 # test issue 14228
 black_listed_test/none: fail # test issue 14228, warnings are required but not expected
 
 # test issue 14410, "typedef C = " is now really illegal syntax
 mixin_illegal_syntax_test/none: fail
 
 # test issue 14736, It is a static warning if a class C declares an instance method named n and has a setter named n=.
 setter4_test: StaticWarning
 
@@ skipping 298 matching lines @@
 
 # This test uses "const Symbol('_setAt')"
 vm/reflect_core_vm_test: CompileTimeError
 
 # This test is expected to have warnings because of noSuchMethod overriding.
 regress_12561_test: StaticWarning
 
 main_not_a_function_test/01: Fail # Issue 20030
 main_test/03: Fail # Issue 20030
 no_main_test/01: Fail # Issue 20030