Add 'meaning' to Intl.messages

pkg/intl/lib/src/intl_message.dart

Index: pkg/intl/lib/src/intl_message.dart
diff --git a/pkg/intl/lib/src/intl_message.dart b/pkg/intl/lib/src/intl_message.dart
index b21c0b85812c0ee5472a83c126334befd61e2ca0..0f9ab6983a1c1ba22c8f2ccd850647de1b1b86ba 100644
--- a/pkg/intl/lib/src/intl_message.dart
+++ b/pkg/intl/lib/src/intl_message.dart
@@ -332,6 +332,13 @@ class MainMessage extends ComplexMessage {
   Map<String, dynamic> examples;
 
   /**
+   * A field to disambiguate two messages that might have exactly the
+   * same text. The two messages will also need different names, but
+   * this can be used by machine translation tools to distinguish them.
+   */
+  String meaning;
+
+  /**
    * The name, which may come from the function name, from the arguments
    * to Intl.message, or we may just re-use the message.
    */
@@ -409,6 +416,7 @@ class MainMessage extends ComplexMessage {
       // We use the actual args from the parser rather than what's given in the
       // arguments to Intl.message.
       case "args" : return;
+      case "meaning" : meaning = value; return;
       default: return;
     }
   }
@@ -425,6 +433,7 @@ class MainMessage extends ComplexMessage {
       // We use the actual args from the parser rather than what's given in the
       // arguments to Intl.message.
       case "args" : return [];
+      case "meaning" : return meaning;
       default: return null;
     }
   }
@@ -435,7 +444,7 @@ class MainMessage extends ComplexMessage {
   get dartMessageName => "message";
 
   /** The parameters that the Intl.message call may provide. */
-  get attributeNames => const ["name", "desc", "examples", "args"];
+  get attributeNames => const ["name", "desc", "examples", "args", "meaning"];
 
   String toString() =>
       "Intl.message(${expanded()}, $name, $description, $examples, $arguments)";