Implement part-of directive.

dart/lib/compiler/implementation/warnings.dart

Index: dart/lib/compiler/implementation/warnings.dart
diff --git a/dart/lib/compiler/implementation/warnings.dart b/dart/lib/compiler/implementation/warnings.dart
index 8036c2d62043232d9fabe8896a4db6f3e14f8790..240fe5874eadd3cc9bebe927428d088d4c658033 100644
--- a/dart/lib/compiler/implementation/warnings.dart
+++ b/dart/lib/compiler/implementation/warnings.dart
@@ -259,6 +259,21 @@ class MessageKind {
   static const VOID_NOT_ALLOWED = const MessageKind(
       'type void is only allowed in a return type.');
 
+  static const BEFORE_TOP_LEVEL = const MessageKind(
+      'Error: part header must come before top-level definitions.');

[Johnni Winther, 2012/10/09 07:43:36]

Why do some messages include 'Error:' and 'Warning:' and others not? Shouldn't
the report mechanism determine and print out the message kind?

[ahe, 2012/10/09 07:48:09]

Historic reasons.
No. That is a problem for localization.

[karlklose, 2012/10/09 07:49:47]

See also http://code.google.com/p/dart/issues/detail?id=5177

+
+  static const LIBRARY_NAME_MISMATCH = const MessageKind(
+      'Warning: expected part of library name "#{1}".');
+
+  static const DUPLICATED_PART_OF = const MessageKind(
+      'Error: duplicated part-of directive.');
+
+  static const ILLEGAL_DIRECTIVE = const MessageKind(
+      'Error: directive not allowed here.');
+
+  static const DUPLICATED_LIBRARY_NAME = const MessageKind(
+      'Warning: duplicated library name "#{1}".');
+
   static const INVALID_SOURCE_FILE_LOCATION = const MessageKind('''
 Invalid offset (#{1}) in source map.
 File: #{2}