Typecheck constructor initializers properly

test/dart_codegen/expect/convert/string_conversion.dart

Index: test/dart_codegen/expect/convert/string_conversion.dart
diff --git a/test/dart_codegen/expect/convert/string_conversion.dart b/test/dart_codegen/expect/convert/string_conversion.dart
index 3661424f35ea2e0a5ac580192f28cd848dbf12c6..7af3b19f15ac54e5de25163a595b8234849159ce 100644
--- a/test/dart_codegen/expect/convert/string_conversion.dart
+++ b/test/dart_codegen/expect/convert/string_conversion.dart
@@ -46,14 +46,14 @@ if (_buffer.isNotEmpty) _flush();
  Iterator iterator = objects.iterator;
  if (!iterator.moveNext()) return; if (separator.isEmpty) {
 do {
-_chunkedSink.add(((__x27) => DDC$RT.cast(__x27, dynamic, String, "CastGeneral", """line 147, column 26 of dart:convert/string_conversion.dart: """, __x27 is String, true))(iterator.current.toString()));
+_chunkedSink.add(((__x28) => DDC$RT.cast(__x28, dynamic, String, "CastGeneral", """line 147, column 26 of dart:convert/string_conversion.dart: """, __x28 is String, true))(iterator.current.toString()));
 }
  while (iterator.moveNext());}
  else {
-_chunkedSink.add(((__x28) => DDC$RT.cast(__x28, dynamic, String, "CastGeneral", """line 150, column 24 of dart:convert/string_conversion.dart: """, __x28 is String, true))(iterator.current.toString()));
+_chunkedSink.add(((__x29) => DDC$RT.cast(__x29, dynamic, String, "CastGeneral", """line 150, column 24 of dart:convert/string_conversion.dart: """, __x29 is String, true))(iterator.current.toString()));
  while (iterator.moveNext()) {
 write(separator);
- _chunkedSink.add(((__x29) => DDC$RT.cast(__x29, dynamic, String, "CastGeneral", """line 153, column 26 of dart:convert/string_conversion.dart: """, __x29 is String, true))(iterator.current.toString()));
+ _chunkedSink.add(((__x30) => DDC$RT.cast(__x30, dynamic, String, "CastGeneral", """line 153, column 26 of dart:convert/string_conversion.dart: """, __x30 is String, true))(iterator.current.toString()));
 }
 }
 }