Remove Collection, Collections and clean up List/Set/Queue implementations of retain/remove.

pkg/yaml/lib/parser.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;
 
 /// Translates a string of characters into a YAML serialization tree.
 ///
 /// This parser is designed to closely follow the spec. All productions in the
 /// spec are numbered, and the corresponding methods in the parser have the same
@@ skipping 1101 matching lines @@
   // 137
   _SequenceNode c_flowSequence(int indent, int ctx) => transaction(() {
     if (!truth(c_indicator(C_SEQUENCE_START))) return null;
     zeroOrOne(() => s_separate(indent, ctx));
     var content = zeroOrOne(() => ns_s_flowSeqEntries(indent, inFlow(ctx)));
     if (!truth(c_indicator(C_SEQUENCE_END))) return null;
     return new _SequenceNode("?", new List<_Node>.from(content));
   });
 
   // 138
-  Collection<_Node> ns_s_flowSeqEntries(int indent, int ctx) {
+  Iterable<_Node> ns_s_flowSeqEntries(int indent, int ctx) {
     var first = ns_flowSeqEntry(indent, ctx);
     if (!truth(first)) return new Queue<_Node>();
     zeroOrOne(() => s_separate(indent, ctx));
 
     var rest;
     if (truth(c_indicator(C_COLLECT_ENTRY))) {
       zeroOrOne(() => s_separate(indent, ctx));
       rest = zeroOrOne(() => ns_s_flowSeqEntries(indent, ctx));
     }
 
@@ skipping 797 matching lines @@
       var pair = contents[i];
       if (pair.first.contains(pos)) return pair.last;
     }
     return null;
   }
 
   /// Associates [value] with [range].
   operator[]=(_Range range, E value) =>
     contents.add(new _Pair<_Range, E>(range, value));
 }