Migrating block 50, first commit, after tool has run

tests/language/compile_time_constant_checked4_test.dart

Index: tests/language/compile_time_constant_checked4_test.dart
diff --git a/tests/language/compile_time_constant_checked4_test.dart b/tests/language/compile_time_constant_checked4_test.dart
deleted file mode 100644
index 5f6226ec64b14bd8a2977e9555f33668af66f45e..0000000000000000000000000000000000000000
--- a/tests/language/compile_time_constant_checked4_test.dart
+++ /dev/null
@@ -1,25 +0,0 @@
-// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-class A {
-  final _x;
-  const A.a1(
-    String //# 01: checked mode compile-time error, static type warning
-      x)
-      : this.a2(x);
-  const A.a2(
-    String //# 02: checked mode compile-time error
-      x)
-      : this.a3(x);
-  const A.a3(
-    String //# 03: checked mode compile-time error
-      x)
-      : _x = x;
-}
-
-use(x) => x;
-
-main() {
-  use(const A.a1(0));
-}