Move core and coreimpl from corelib/ to lib/core and lib/coreimpl.

corelib/src/comparable.dart

Index: corelib/src/comparable.dart
diff --git a/corelib/src/comparable.dart b/corelib/src/comparable.dart
deleted file mode 100644
index 728ff6fce522b18c129053fda8d15168ae0aef07..0000000000000000000000000000000000000000
--- a/corelib/src/comparable.dart
+++ /dev/null
@@ -1,13 +0,0 @@
-// Copyright (c) 2011, 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.
-
-// Dart core library.
-
-abstract class Comparable {
-  factory Comparable._uninstantiable() {
-    throw const UnsupportedOperationException(
-        "abstract class Comparable cannot be instantiated");
-  }
-  abstract int compareTo(Comparable other);
-}