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

corelib/src/collection.dart

-// 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.
-
-/**
- * The [Collection] interface is the public interface of all
- * collections.
- */
-interface Collection<E> extends Iterable<E> {
-  /**
-   * Applies the function [f] to each element of this collection.
-   */
-  void forEach(void f(E element));
-
-  /**
-   * Returns a new collection with the elements [: f(e) :]
-   * for each element [:e:] of this collection.
-   *
-   * Note on typing: the return type of f() could be an arbitrary
-   * type and consequently the returned collection's
-   * typeis Collection.
-   */
-  Collection map(f(E element));
-
-  /**
-   * Reduce a collection to a single value by iteratively combining each element
-   * of the collection with an existing value using the provided function.
-   * Use [initialValue] as the initial value, and the function [combine] to
-   * create a new value from the previous one and an element.
-   *
-   * Example of calculating the sum of a collection:
-   *
-   *   collection.reduce(0, (prev, element) => prev + element);
-   */
-  Dynamic reduce(Dynamic initialValue,
-                 Dynamic combine(Dynamic previousValue, E element));
-
-  /**
-   * Returns a new collection with the elements of this collection
-   * that satisfy the predicate [f].
-   *
-   * An element satisfies the predicate [f] if [:f(element):]
-   * returns true.
-   */
-  Collection<E> filter(bool f(E element));
-
-  /**
-   * Returns true if every elements of this collection satisify the
-   * predicate [f]. Returns false otherwise.
-   */
-  bool every(bool f(E element));
-
-  /**
-   * Returns true if one element of this collection satisfies the
-   * predicate [f]. Returns false otherwise.
-   */
-  bool some(bool f(E element));
-
-  /**
-   * Returns true if there is no element in this collection.
-   */
-  bool isEmpty();
-
-  /**
-   * Returns the number of elements in this collection.
-   */
-  int get length();
-}