Migrate language block 46 - canonical_const ... char_escape.

tests/language_2/cascade2_test.dart

Index: tests/language_2/cascade2_test.dart
diff --git a/tests/language/cascade2_test.dart b/tests/language_2/cascade2_test.dart
similarity index 87%
rename from tests/language/cascade2_test.dart
rename to tests/language_2/cascade2_test.dart
index 3f6277ecba6a33a820693c26caba102a9a6cfa0a..4121667975cda2536c90d4b3991902a3b6534206 100644
--- a/tests/language/cascade2_test.dart
+++ b/tests/language_2/cascade2_test.dart
@@ -20,9 +20,9 @@ class A {
 }
 
 main() {
-  var foo = [42, 0];
+  var foo = <dynamic>[42, 0];
   var a = new A();
   var bar = a..add(foo)('WHAT');
   a..foo[0] = new Object();
-  Expect.throws(() => foo[0] + 2, (e) => e is NoSuchMethodError);
+  Expect.throwsNoSuchMethodError(() => foo[0] + 2);
 }