Add a flag to prohibit plurals/genders that don't take up the whole string.

pkg/intl/test/message_extraction/embedded_plural_text_after.dart

Index: pkg/intl/test/message_extraction/embedded_plural_text_after.dart
diff --git a/pkg/intl/test/message_extraction/embedded_plural_text_after.dart b/pkg/intl/test/message_extraction/embedded_plural_text_after.dart
new file mode 100644
index 0000000000000000000000000000000000000000..15704aea86341d581628b0c82bbefc0181dd2c95
--- /dev/null
+++ b/pkg/intl/test/message_extraction/embedded_plural_text_after.dart
@@ -0,0 +1,15 @@
+// Copyright (c) 2014, 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.
+
+/// A test library that should fail because there is a plural with text
+/// following the plural expression.
+library embedded_plural_text_after;
+
+import "package:intl/intl.dart";
+
+embeddedPlural2(n) => Intl.message(
+    "${Intl.plural(n, zero: 'none', one: 'one', other: 'some')} plus text.",
+    name: 'embeddedPlural2',
+    desc: 'An embedded plural',
+    args: [n]);