Typecheck constructor initializers properly

test/dart_codegen/expect/convert/utf.dart

Index: test/dart_codegen/expect/convert/utf.dart
diff --git a/test/dart_codegen/expect/convert/utf.dart b/test/dart_codegen/expect/convert/utf.dart
index 97c9f773962cdae15b4bf86f661ec2e9146792dd..3635003a6f251d40cb953fbef2d07f4076d0adfd 100644
--- a/test/dart_codegen/expect/convert/utf.dart
+++ b/test/dart_codegen/expect/convert/utf.dart
@@ -39,11 +39,11 @@ if (sink is! ByteConversionSink) {
   }
  return new _Utf8EncoderSink(sink);
 }
- Stream<List<int>> bind(Stream<String> stream) => ((__x30) => DDC$RT.cast(__x30, DDC$RT.type((DDC$async$.Stream<dynamic> _) {
+ Stream<List<int>> bind(Stream<String> stream) => ((__x31) => DDC$RT.cast(__x31, DDC$RT.type((DDC$async$.Stream<dynamic> _) {
 }
 ), DDC$RT.type((DDC$async$.Stream<List<int>> _) {
 }
-), "CastDynamic", """line 129, column 52 of dart:convert/utf.dart: """, __x30 is DDC$async$.Stream<List<int>>, false))(super.bind(stream));
+), "CastDynamic", """line 129, column 52 of dart:convert/utf.dart: """, __x31 is DDC$async$.Stream<List<int>>, false))(super.bind(stream));
 }
  class _Utf8Encoder {int _carry = 0;
  int _bufferIndex = 0;
@@ -170,11 +170,11 @@ stringSink = new StringConversionSink.from(sink);
 }
  return stringSink.asUtf8Sink(_allowMalformed);
 }
- Stream<String> bind(Stream<List<int>> stream) => ((__x31) => DDC$RT.cast(__x31, DDC$RT.type((DDC$async$.Stream<dynamic> _) {
+ Stream<String> bind(Stream<List<int>> stream) => ((__x32) => DDC$RT.cast(__x32, DDC$RT.type((DDC$async$.Stream<dynamic> _) {
 }
 ), DDC$RT.type((DDC$async$.Stream<String> _) {
 }
-), "CastDynamic", """line 361, column 52 of dart:convert/utf.dart: """, __x31 is DDC$async$.Stream<String>, false))(super.bind(stream));
+), "CastDynamic", """line 361, column 52 of dart:convert/utf.dart: """, __x32 is DDC$async$.Stream<String>, false))(super.bind(stream));
  external Converter<List<int>, dynamic> fuse(Converter<String, dynamic> next);
 }
  const int _ONE_BYTE_LIMIT = 0x7f;