Allow arity checks on dynamic function types

test/dart_codegen/expect/convert/json.dart

Index: test/dart_codegen/expect/convert/json.dart
diff --git a/test/dart_codegen/expect/convert/json.dart b/test/dart_codegen/expect/convert/json.dart
index 5ca0e8ef25ebabe498e0f9110cb61e7c53ab0956..328dd00c9edcf733f3beeb2160b448428c58a922 100644
--- a/test/dart_codegen/expect/convert/json.dart
+++ b/test/dart_codegen/expect/convert/json.dart
@@ -60,7 +60,7 @@ if (_reviver == null) return const JsonDecoder();
  final Function _toEncodable;
  const JsonEncoder([Object toEncodable(Object nonSerializable)]) : this.indent = null, this._toEncodable = toEncodable;
  const JsonEncoder.withIndent(this.indent, [Object toEncodable(Object nonSerializable)]) : this._toEncodable = toEncodable;
- String convert(Object object) => _JsonStringStringifier.stringify(object, DEVC$RT.cast(_toEncodable, Function, __t9, "CastGeneral", """line 243, column 48 of dart:convert/json.dart: """, _toEncodable is __t9, false), indent);
+ String convert(Object object) => _JsonStringStringifier.stringify(object, DEVC$RT.cast(_toEncodable, Function, __t9, "CastGeneral", """line 243, column 48 of dart:convert/json.dart: """, _toEncodable is __t9, true), indent);
  ChunkedConversionSink<Object> startChunkedConversion(Sink<String> sink) {
 if (sink is! StringConversionSink) {
 sink = new StringConversionSink.from(sink);
@@ -160,7 +160,7 @@ throw new StateError("Only one call to add allowed");
 }
  _isDone = true;
  ClosableStringSink stringSink = _sink.asStringSink();
- _JsonStringStringifier.printOn(o, stringSink, DEVC$RT.cast(_toEncodable, Function, __t9, "CastGeneral", """line 425, column 51 of dart:convert/json.dart: """, _toEncodable is __t9, false), _indent);
+ _JsonStringStringifier.printOn(o, stringSink, DEVC$RT.cast(_toEncodable, Function, __t9, "CastGeneral", """line 425, column 51 of dart:convert/json.dart: """, _toEncodable is __t9, true), _indent);
  stringSink.close();
 }
  void close() {