Make dart:collection strong-mode clean.

sdk/lib/collection/list.dart

 // Copyright (c) 2013, 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.
 
 part of dart.collection;
 
 /**
  * Abstract implementation of a list.
  *
  * `ListBase` can be used as a base class for implementing the `List` interface.
@@ skipping 291 matching lines @@
     if (length == 0) {
       throw IterableElementError.noElement();
     }
     E result = this[length - 1];
     length--;
     return result;
   }
 
   void sort([int compare(E a, E b)]) {
     if (compare == null) {
-      var defaultCompare = Comparable.compare;
-      compare = defaultCompare;
+      Sort.sort(this, Comparable.compare);
+    } else {
+      Sort.sort(this, compare);
     }
-    Sort.sort(this, compare);
   }
 
   void shuffle([Random random]) {
     if (random == null) random = new Random();
     int length = this.length;
     while (length > 1) {
       int pos = random.nextInt(length);
       length -= 1;
       var tmp = this[length];
       this[length] = this[pos];
@@ skipping 35 matching lines @@
       this[i] = fill;
     }
   }
 
   void setRange(int start, int end, Iterable<E> iterable, [int skipCount = 0]) {
     RangeError.checkValidRange(start, end, this.length);
     int length = end - start;
     if (length == 0) return;
     RangeError.checkNotNegative(skipCount, "skipCount");
 
-    List otherList;
+    List<E> otherList;
     int otherStart;
     // TODO(floitsch): Make this accept more.
-    if (iterable is List) {
+    if (iterable is List/*<E>*/) {
       otherList = iterable;
       otherStart = skipCount;
     } else {
       otherList = iterable.skip(skipCount).toList(growable: false);
       otherStart = 0;
     }
     if (otherStart + length > otherList.length) {
       throw IterableElementError.tooFew();
     }
     if (otherStart < start) {
@@ skipping 122 matching lines @@
       for (E element in iterable) {
         this[index++] = element;
       }
     }
   }
 
   Iterable<E> get reversed => new ReversedListIterable<E>(this);
 
   String toString() => IterableBase.iterableToFullString(this, '[', ']');
 }