Remove insertRange.

pkg/yaml/lib/model.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.
 
 part of yaml;
 
 // This file contains the node classes for the internal representations of YAML
 // documents. These nodes are used for both the serialization tree and the
 // representation graph.
 
@@ skipping 172 matching lines @@
 
     throw new YamlException("unknown scalar value: $value");
   }
 
   String toString() => '$tag "$content"';
 
   /// Left-pads [str] with zeros so that it's at least [length] characters
   /// long.
   String zeroPad(String str, int length) {
     assert(length >= str.length);
-    var prefix = [];
-    prefix.insertRange(0, length - str.length, '0');
+    var prefix = new List.filled(length - str.length, '0');
     return '${prefix.join()}$str';
   }
 
   int get hashCode => super.hashCode ^ content.hashCode;
 
   visit(_Visitor v) => v.visitScalar(this);
 }
 
 /// A mapping node represents an unordered map of nodes to nodes.
 class _MappingNode extends _Node {
@@ skipping 19 matching lines @@
     var strContent = content.keys
         .map((k) => '${k}: ${content[k]}')
         .join(', ');
     return '$tag {$strContent}';
   }
 
   int get hashCode => super.hashCode ^ _hashCode(content);
 
   visit(_Visitor v) => v.visitMapping(this);
 }