Allow Intl.plural/gender as the top-level, omitting the Intl.message wrapper and the first layer of…

pkg/intl/lib/src/intl_message.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.
 
 /**
  * This provides classes to represent the internal structure of the
  * arguments to `Intl.message`. It is used when parsing sources to extract
  * messages or to generate code for message substitution. Normal programs
  * using Intl would not import this library.
  *
@@ skipping 373 matching lines @@
   String mainArgument;
 
   /**
    * Return the list of attribute names to use when generating code. This
    *  may be different from [attributeNames] if there are multiple aliases
    *  that map to the same clause.
    */
   List<String> get codeAttributeNames;
 
   String expanded([Function transform = _nullTransform]) {
-    fullMessageForClause(key) => key + '{' + transform(parent, this[key]) + '}';
+    fullMessageForClause(key) => key + '{' +
+        transform(parent, this[key]).toString() + '}';
     var clauses = attributeNames
         .where((key) => this[key] != null)
-        .map(fullMessageForClause);
+        .map(fullMessageForClause).toList();
     return "{$mainArgument,$icuMessageName, ${clauses.join("")}}";
   }
 
   String toCode() {
     var out = new StringBuffer();
     out.write('\${');
     out.write(dartMessageName);
     out.write('(');
     out.write(mainArgument);
     var args = codeAttributeNames.where(
@@ skipping 103 matching lines @@
        case "two" : return two;
        case "=2" : return two;
        case "few" : return few;
        case "many" : return many;
        case "other" : return other;
        default: return other;
      }
    }
 }