Added test using void in new positions.

tests/language/language.status

Index: tests/language/language.status
diff --git a/tests/language/language.status b/tests/language/language.status
index 2e2fb0117a67cf89ecf4f9e379d3ee41cbe34b51..6dfdda25943185b7710c31060fb89550170618f9 100644
--- a/tests/language/language.status
+++ b/tests/language/language.status
@@ -404,6 +404,7 @@ config_import_corelib_test: StaticWarning, OK
 
 [ ($runtime == vm || $runtime == flutter || $runtime == dart_precompiled || $runtime == dartium || $runtime == drt) && ($compiler == none || $compiler == app_jit || $compiler == precompiler) ]
 await_for_test: RuntimeError # issue 28974
+generalized_void_syntax_test: CompileTimeError # Issue #30176.
 
 # flutter uses --error_on_bad_type, --error_on_bad_override
 # and --await_is_keyword so # the following tests fail with