Address Ivan's comments.

runtime/lib/growable_array.dart

 // Copyright (c) 2012, 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 _GrowableObjectArray<T> implements List<T> {
   factory _GrowableObjectArray._uninstantiable() {
     throw new UnsupportedError(
         "GrowableObjectArray can only be allocated by the VM");
   }
 
@@ skipping 154 matching lines @@
   void _grow(int new_length) {
     var new_data = new _ObjectArray<T>(new_length);
     for (int i = 0; i < length; i++) {
       new_data[i] = this[i];
     }
     _setData(new_data);
   }
 
   // Collection interface.
 
-  bool contains(T element) => Collections.contains(this, element);
+  bool contains(T element) {
+    return Collections.contains(this, element);
+  }
 
   void forEach(f(T element)) {
     // TODO(srdjan): Use Collections.forEach(this, f);
     // Accessing the list directly improves DeltaBlue performance by 25%.
     for (int i = 0; i < length; i++) {
       f(this[i]);
     }
   }
 
-  Iterable mappedBy(f(T element)) => new MappedIterable<T, dynamic>(this, f);
+  Iterable mappedBy(f(T element)) {
+    return new MappedIterable<T, dynamic>(this, f);
+  }
 
   reduce(initialValue, combine(previousValue, T element)) {
     return Collections.reduce(this, initialValue, combine);
   }
 
-  Iterable<T> where(bool f(T element)) => new WhereIterable<T>(this, f);
+  Iterable<T> where(bool f(T element)) {
+    return new WhereIterable<T>(this, f);
+  }
 
   bool every(bool f(T element)) {
     return Collections.every(this, f);
   }
 
   bool any(bool f(T element)) {
     return Collections.any(this, f);
   }
 
   bool get isEmpty {
     return this.length == 0;
   }
 
   void clear() {
     this.length = 0;
   }
 
   void sort([Comparator<T> compare = Comparable.compare]) {
     _Sort.sort(this, compare);
   }
 
   String toString() {
     return Collections.collectionToString(this);
   }
 
-  Iterator<T> get iterator => new SequenceIterator<T>(this);
+  Iterator<T> get iterator {
+    return new SequenceIterator<T>(this);
+  }
 
   List<T> toList() {
     return new List<T>.from(this);
   }
 
   Set<T> toSet() {
     return new Set<T>.from(this);
   }
 }