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

pkg/intl/test/message_extraction/verify_messages.dart

Index: pkg/intl/test/message_extraction/verify_messages.dart
diff --git a/pkg/intl/test/message_extraction/verify_messages.dart b/pkg/intl/test/message_extraction/verify_messages.dart
index d368c36aa15b064c54afdb08490dbe99eb8c1bba..d7a949fa81f212a18c4903dd272c76ac6c348ad9 100644
--- a/pkg/intl/test/message_extraction/verify_messages.dart
+++ b/pkg/intl/test/message_extraction/verify_messages.dart
@@ -51,6 +51,8 @@ verifyResult(ignored) {
   verify('5 some currency or other.');
   verify('1 Canadian dollar');
   verify('2 Canadian dollars');
+  verify('1 thing:');
+  verify('2 things:');
 
   var fr_lines = expanded.skip(1).skipWhile(
       (line) => !line.contains('----')).toList();
@@ -98,6 +100,8 @@ verifyResult(ignored) {
   verify('5 certaine devise ou autre.');
   verify('1 dollar Canadien');
   verify('2 dollars Canadiens');
+  verify('1 chose:');
+  verify('2 choses:');
 
   var de_lines = fr_lines.skip(1).skipWhile(
       (line) => !line.contains('----')).toList();
@@ -145,4 +149,6 @@ verifyResult(ignored) {
   verify('5 einige Währung oder anderen.');
   verify('1 Kanadischer dollar');
   verify('2 Kanadischen dollar');
+  verify('eins:');
+  verify('2 Dinge:');
 }