Attach source range information to parsed YAML nodes.

pkg/yaml/lib/src/visitor.dart

Index: pkg/yaml/lib/src/visitor.dart
diff --git a/pkg/yaml/lib/src/visitor.dart b/pkg/yaml/lib/src/visitor.dart
index 7095268d346626ca047de2be7ca2bf07fcf91550..3f4c45538078bb86745a85451c0a9ed6518adef1 100644
--- a/pkg/yaml/lib/src/visitor.dart
+++ b/pkg/yaml/lib/src/visitor.dart
@@ -4,8 +4,8 @@
 
 library yaml.visitor;
 
+import 'equality.dart';
 import 'model.dart';
-import 'yaml_map.dart';
 
 /// The visitor pattern for YAML documents.
 class Visitor {
@@ -21,7 +21,7 @@ class Visitor {
 
   /// Visits each key and value in [map] and returns a map of the results.
   visitMapping(MappingNode map) {
-    var out = new YamlMap();
+    var out = deepEqualsMap();
     for (var key in map.content.keys) {
       out[key.visit(this)] = map.content[key].visit(this);
     }