Change assert implementation to not depend on a top-level function called 'assert'.

lib/compiler/implementation/scanner/keyword.dart

Index: lib/compiler/implementation/scanner/keyword.dart
diff --git a/lib/compiler/implementation/scanner/keyword.dart b/lib/compiler/implementation/scanner/keyword.dart
index 87aeaf6fd520e97dde87a0cd95fe2be4a793b833..c071910865379c38b8ed67d1f90a6b02937e6cca 100644
--- a/lib/compiler/implementation/scanner/keyword.dart
+++ b/lib/compiler/implementation/scanner/keyword.dart
@@ -36,24 +36,27 @@ class Keyword implements SourceString {
   static const Keyword VOID = const Keyword("void");
   static const Keyword WHILE = const Keyword("while");
 
-  // Pseudo keywords:
+  // Built-in identifiers.

[ahe, 2012/09/05 11:09:54]

Why is it necessary to change this file?

[Lasse Reichstein Nielsen, 2012/09/05 12:51:20]

It isn't. 
I keep getting confused by this "pseudo keyword" name which doesn't appear in
the specification. We don't actually handle built-in identifiers correctly, but
I still like to know which ones are which.

If you don't like it, I can revert it.

   static const Keyword ABSTRACT = const Keyword("abstract", isPseudo: true);
   static const Keyword AS = const Keyword("as", info: AS_INFO, isPseudo: true);
   static const Keyword ASSERT = const Keyword("assert", isPseudo: true);
+  // And "Dynamic".

[Johnni Winther, 2012/09/05 09:07:05]

Is there no const for Dynamic? Don't we need it?

[ngeoffray, 2012/09/05 10:37:10]

What is this comment for?

[Lasse Reichstein Nielsen, 2012/09/05 12:51:20]

Apparently not, to both questions.
This was just a reordering I did for my own sake. We don't handle built-in
keywords properly in the compiler, so it currently doesn't matter if we detect
them. I guess we detect 'Dynamic' magically in the type resolver.

[Lasse Reichstein Nielsen, 2012/09/05 12:51:20]

Reminder that "Dynamic" is a built-in identifier, i.e., the list of declarations
is not complete.

   static const Keyword EXTERNAL = const Keyword("external", isPseudo: true);
   static const Keyword FACTORY = const Keyword("factory", isPseudo: true);
   static const Keyword GET = const Keyword("get", isPseudo: true);
   static const Keyword IMPLEMENTS = const Keyword("implements", isPseudo: true);
+  static const Keyword OPERATOR = const Keyword("operator", isPseudo: true);
+  static const Keyword SET = const Keyword("set", isPseudo: true);
+  static const Keyword STATIC = const Keyword("static", isPseudo: true);
+  static const Keyword TYPEDEF = const Keyword("typedef", isPseudo: true);
+
+  // Pseudo keywords:
   static const Keyword IMPORT = const Keyword("import", isPseudo: true);
   static const Keyword INTERFACE = const Keyword("interface", isPseudo: true);
   static const Keyword LIBRARY = const Keyword("library", isPseudo: true);
   static const Keyword NATIVE = const Keyword("native", isPseudo: true);
-  static const Keyword OPERATOR = const Keyword("operator", isPseudo: true);
   static const Keyword ON = const Keyword("on", isPseudo: true);
-  static const Keyword SET = const Keyword("set", isPseudo: true);
   static const Keyword SOURCE = const Keyword("source", isPseudo: true);
-  static const Keyword STATIC = const Keyword("static", isPseudo: true);
-  static const Keyword TYPEDEF = const Keyword("typedef", isPseudo: true);
 
   static const List<Keyword> values = const <Keyword> [
       AS,