Do not overwrite values on plurals/genders with the results of constant evaluation

pkg/intl/test/message_extraction/sample_with_messages.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 is a program with various [Intl.message] messages. It just prints
  * all of them, and is used for testing of message extraction, translation,
  * and code generation.
  */
 library sample;
@@ skipping 55 matching lines @@
 // This is unremarkable in English, but the translated versions will contain
 // characters that ought to be escaped during code generation.
 escapable() => Intl.message("Escapable characters here: ", name: "escapable");
 
 outerPlural(n) => Intl.plural(n, zero: 'none', one: 'one', other: 'some',
     name: 'outerPlural', desc: 'A plural with no enclosing message', args: [n]);
 
 outerGender(g) => Intl.gender(g, male: 'm', female: 'f', other: 'o',
     name: 'outerGender', desc: 'A gender with no enclosing message', args: [g]);
 
+pluralThatFailsParsing(noOfThings) => Intl.plural(noOfThings,
+    one: "1 thing:",
+    other: "$noOfThings things:",
+    name: "pluralThatFailsParsing",
+    args: [noOfThings],
+    desc: "How many things are there?");
+
 // A standalone gender message where we don't provide name or args. This should
 // be rejected by validation code.
 invalidOuterGender(g) => Intl.gender(g, other: 'o');
 
 // A general select
 outerSelect(currency, amount) => Intl.select(currency,
     {
       "CDN" : "$amount Canadian dollars",
       "other" : "$amount some currency or other."
     },
@@ skipping 78 matching lines @@
 
     printOut(outerPlural(0));
     printOut(outerPlural(1));
     printOut(outerGender("male"));
     printOut(outerGender("female"));
     printOut(nestedOuter(7, "male"));
     printOut(outerSelect("CDN", 7));
     printOut(outerSelect("EUR", 5));
     printOut(nestedSelect("CDN", 1));
     printOut(nestedSelect("CDN", 2));
+    printOut(pluralThatFailsParsing(1));
+    printOut(pluralThatFailsParsing(2));
   });
 }
 
 var localeToUse = 'en_US';
 
 main() {
   var fr = new Intl("fr");
   var english = new Intl("en_US");
   var de = new Intl("de_DE");
   // Throw in an initialize of a null locale to make sure it doesn't throw.
   initializeMessages(null);
   var f1 = initializeMessages(fr.locale).then((_) => printStuff(fr));
   var f2 = initializeMessages(de.locale).then((_) => printStuff(de));
   printStuff(english);
   return Future.wait([f1, f2]);
 }