Support StackTrace.current

tool/sdk_expected_errors.txt

Index: tool/sdk_expected_errors.txt
diff --git a/tool/sdk_expected_errors.txt b/tool/sdk_expected_errors.txt
index 1f8ca2f876b8902c09450b7d0f2e9f1816bd254d..972243b627a8c58eec03b08bc71cdd834e5be0c0 100644
--- a/tool/sdk_expected_errors.txt
+++ b/tool/sdk_expected_errors.txt
@@ -6,6 +6,9 @@ severe: [STATIC_TYPE_ERROR] Type check failed: (_BroadcastSubscription<T> subscr
 severe: [STATIC_TYPE_ERROR] Type check failed: _nullDataHandler ((dynamic) → void) is not of type (T) → void (dart:async/stream_impl.dart, line 153, col 42)
 severe: [STATIC_TYPE_ERROR] Type check failed: _defaultHandleData ((dynamic, EventSink<dynamic>) → void) is not of type (S, EventSink<T>) → void (dart:async/stream_transformers.dart, line 234, col 48)
 severe: [STATIC_TYPE_ERROR] Type check failed: _defaultHandleError ((dynamic, StackTrace, EventSink<dynamic>) → void) is not of type (Object, StackTrace, EventSink<T>) → void (dart:async/stream_transformers.dart, line 235, col 50)
+severe: [AnalyzerMessage] Annotation can be only constant variable or constant constructor invocation (dart:core/stacktrace.dart, line 27, col 3)
+severe: [AnalyzerMessage] The class 'StackTrace' does not have a constructor 'fromString' (dart:core/stacktrace.dart, line 31, col 48)
+severe: [AnalyzerMessage] The class 'StackTrace' does not have a constructor 'fromString' (dart:core/stacktrace.dart, line 35, col 50)
 warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to Iterable<SendPort> (dart:_isolate_helper, line 574, col 29)
 warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to List<String> (dart:_isolate_helper, line 839, col 37)
 warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to List<String> (dart:_isolate_helper, line 886, col 11)