restrict generic function type subtyping

pkg/dev_compiler/tool/sdk_expected_errors.txt

Index: pkg/dev_compiler/tool/sdk_expected_errors.txt
diff --git a/pkg/dev_compiler/tool/sdk_expected_errors.txt b/pkg/dev_compiler/tool/sdk_expected_errors.txt
index 80eacbc89a5eafc9d985d257198439ef4419a129..63ae0c6fd2b2755d84e3927b37b1ddc7f07cef20 100644
--- a/pkg/dev_compiler/tool/sdk_expected_errors.txt
+++ b/pkg/dev_compiler/tool/sdk_expected_errors.txt
@@ -1,5 +1,12 @@
 [error] Couldn't infer type parameter 'T'; '_ControllerEventSinkWrapper<dynamic>' must be of type 'EventSink<T>'. (dart:async/stream.dart, line 1346, col 16)
 [error] The argument type '_ControllerEventSinkWrapper' can't be assigned to the parameter type 'EventSink<T>'. (dart:async/stream.dart, line 1346, col 53)
+[error] A value of type '<R>(Zone, ZoneDelegate, Zone, () → R) → R' can't be assigned to a parameter of type '(Zone, ZoneDelegate, Zone, () → dynamic) → dynamic'. (dart:async/zone.dart, line 1071, col 51)
+[error] A value of type '<R,T>(Zone, ZoneDelegate, Zone, (T) → R, T) → R' can't be assigned to a parameter of type '(Zone, ZoneDelegate, Zone, (dynamic) → dynamic, dynamic) → dynamic'. (dart:async/zone.dart, line 1073, col 56)
+[error] A value of type '<R,T1,T2>(Zone, ZoneDelegate, Zone, (T1, T2) → R, T1, T2) → R' can't be assigned to a parameter of type '(Zone, ZoneDelegate, Zone, (dynamic, dynamic) → dynamic, dynamic, dynamic) → dynamic'. (dart:async/zone.dart, line 1075, col 57)
+[error] A value of type '<R>(Zone, ZoneDelegate, Zone, () → R) → () → R' can't be assigned to a parameter of type '(Zone, ZoneDelegate, Zone, () → dynamic) → () → dynamic'. (dart:async/zone.dart, line 1078, col 23)
+[error] A value of type '<R,T>(Zone, ZoneDelegate, Zone, (T) → R) → (T) → R' can't be assigned to a parameter of type '(Zone, ZoneDelegate, Zone, (dynamic) → dynamic) → (dynamic) → dynamic'. (dart:async/zone.dart, line 1081, col 23)
+[error] A value of type '<R,T1,T2>(Zone, ZoneDelegate, Zone, (T1, T2) → R) → (T1, T2) → R' can't be assigned to a parameter of type '(Zone, ZoneDelegate, Zone, (dynamic, dynamic) → dynamic) → (dynamic, dynamic) → dynamic'. (dart:async/zone.dart, line 1084, col 23)
+[error] A value of type '<R>(Zone, ZoneDelegate, Zone, dynamic, StackTrace) → R' can't be assigned to a parameter of type '(Zone, ZoneDelegate, Zone, dynamic, StackTrace) → dynamic'. (dart:async/zone.dart, line 1100, col 23)
 [error] Invalid override. The type of 'ChunkedConverter.bind' ('(dynamic) → dynamic') isn't a subtype of 'Converter<S, T>.bind' ('(Stream<S>) → Stream<T>'). (dart:convert/chunked_conversion.dart, line 14, col 3)
 [error] Invalid override. The type of 'ChunkedConverter.bind' ('(dynamic) → dynamic') isn't a subtype of 'StreamTransformer<S, T>.bind' ('(Stream<S>) → Stream<T>'). (dart:convert/chunked_conversion.dart, line 14, col 3)
 [error] Invalid override. The type of 'ChunkedConverter.startChunkedConversion' ('(dynamic) → dynamic') isn't a subtype of 'Converter<S, T>.startChunkedConversion' ('(Sink<T>) → Sink<S>'). (dart:convert/chunked_conversion.dart, line 15, col 3)