fix #28008, fix #28009 implement FutureOr<T>

tests/lib/lib.status

Index: tests/lib/lib.status
diff --git a/tests/lib/lib.status b/tests/lib/lib.status
index e15fd0e35fe98231d99da64c298e6e733883a39d..c064cd7b03d8ca16c7884d09c3d808fb6ecb0bdb 100644
--- a/tests/lib/lib.status
+++ b/tests/lib/lib.status
@@ -315,11 +315,6 @@ mirrors/null_test: Fail # Issue 16831
 async/schedule_microtask_test: Fail  # Preamble file does not correctly implement scheduleImmediate.
 
 [ $compiler == dartanalyzer || $compiler == dart2analyzer ]
-async/future_or_bad_type_test/00: MissingStaticWarning # Issue 28008
-async/future_or_bad_type_test/implements: MissingCompileTimeError # Issue 28008
-async/future_or_non_strong_test: StaticWarning # Issue 28008
-async/future_or_strong_test: StaticWarning # Issue 28008
-
 mirrors/generic_f_bounded_mixin_application_test: StaticWarning # Test Issue
 
 mirrors/redirecting_factory_test/01: StaticWarning # test issue X, The return type 'Class<T2, T1>' of the redirected constructor is not assignable to 'Class<T1, T2>'