Revert "Removes dartc reliance on its own libraries, now can be targeted at any implementation's li…

compiler/lib/implementation/collections.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 [Collections] class implements static methods useful when
+ * writing a class that implements [Collection] and the [iterator]
+ * method.
+ */
+class Collections {
+  static void forEach(Iterable<Object> iterable, void f(Object o)) {
+    for (final e in iterable) {
+      f(e);
+    }
+  }
+
+  static List map(Iterable<Object> source,
+                  List<Object> destination,
+                  f(o)) {
+    for (final e in source) {
+      destination.add(f(e));
+    }
+    return destination;
+  }
+
+  static bool some(Iterable<Object> iterable, bool f(Object o)) {
+    for (final e in iterable) {
+      if (f(e)) return true;
+    }
+    return false;
+  }
+
+  static bool every(Iterable<Object> iterable, bool f(Object o)) {
+    for (final e in iterable) {
+      if (!f(e)) return false;
+    }
+    return true;
+  }
+
+  static List filter(Iterable<Object> source,
+                     List<Object> destination,
+                     bool f(o)) {
+    for (final e in source) {
+      if (f(e)) destination.add(e);
+    }
+    return destination;
+  }
+
+  static bool isEmpty(Iterable<Object> iterable) {
+    return !iterable.iterator().hasNext();
+  }
+
+  static String collectionToString(Collection c) => c.toString();
+
+  static void _emitObject(Object o, StringBuffer result, List visiting) {
+  }
+}