Rationalize coercions

test/dart_codegen/expect/core/iterable.dart

Index: test/dart_codegen/expect/core/iterable.dart
diff --git a/test/dart_codegen/expect/core/iterable.dart b/test/dart_codegen/expect/core/iterable.dart
index 9cb11bdf5e78b3d17763c3ec355d5fbd079015f7..fa99acd9fc4f106d392b2e7e722ea8082c1dd095 100644
--- a/test/dart_codegen/expect/core/iterable.dart
+++ b/test/dart_codegen/expect/core/iterable.dart
@@ -48,7 +48,7 @@ part of dart.core;
  final _Generator<E> _generator;
  _GeneratorIterable(this._end, E generator(int n)) : _start = 0, _generator = ((__x10) => DEVC$RT.cast(__x10, dynamic, DEVC$RT.type((__t8<E> _) {
 }
-), "CastGeneral", """line 319, column 22 of dart:core/iterable.dart: """, __x10 is __t8<E>, false))((generator != null) ? generator : _id);
+), "CompositeCast", """line 319, column 22 of dart:core/iterable.dart: """, __x10 is __t8<E>, false))((generator != null) ? generator : _id);
  _GeneratorIterable.slice(this._start, this._end, this._generator);
  Iterator<E> get iterator => new _GeneratorIterator<E>(_start, _end, _generator);
  int get length => _end - _start;