Implemented support for generalized void in analyzer.

tests/language/language.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.
 
 # This directory contains tests that are intended to show the
 # current state of the language.
 
 [ $strong ]
 *: SkipByDesign # tests/language_strong has the strong mode versions of these tests.
 
@@ skipping 316 matching lines @@
 closure_cycles_test: Pass, Crash
 vm/math_vm_test: Crash
 
 [$compiler == dart2analyzer]
 vm/regress_27201_test: SkipByDesign # Loads bad library, so will always crash.
 config_import_corelib_test: StaticWarning, OK
 
 [ ($runtime == vm || $runtime == flutter || $runtime == dart_precompiled) && ($compiler == none || $compiler == app_jit || $compiler == precompiler) ]
 await_for_test: RuntimeError # issue 28974
 generalized_void_syntax_test: CompileTimeError # Issue #30176.
+syntax_test/none: CompileTimeError # Issue #30176.
 
 # flutter uses --error_on_bad_type, --error_on_bad_override
 # and --await_is_keyword so # the following tests fail with
 # a Compilation Error
 [ $runtime == flutter ]
 await_backwards_compatibility_test/none: CompileTimeError
 await_test: CompileTimeError
 async_await_test: CompileTimeError
 async_await_syntax_test/a05c: CompileTimeError
 async_await_syntax_test/a05e: CompileTimeError
@@ skipping 227 matching lines @@
 async_return_types_test/wrongTypeParameter: Skip # Flutter Issue 9110
 async_return_types_test/wrongReturnType: Skip # Flutter Issue 9110
 async_return_types_test/return_value_sync_star: Skip # Flutter Issue 9110
 asyncstar_yield_test: Skip # Flutter Issue 9110
 async_star_no_cancel_test: Skip # Flutter Issue 9110
 async_star_cancel_while_paused_test: Skip # Flutter Issue 9110
 await_for_test: Skip # Flutter Issue 9110
 await_for_cancel_test: Skip # Flutter Issue 9110