Add a draft of traversing visitor which will analyse function.

lib/compiler/implementation/leg.dart

Index: lib/compiler/implementation/leg.dart
diff --git a/lib/compiler/implementation/leg.dart b/lib/compiler/implementation/leg.dart
index 1a1a978939b53c1650a8010275a246edc43b4418..9deb56d2b45d04271d8b45dc6156f8a7292bed14 100644
--- a/lib/compiler/implementation/leg.dart
+++ b/lib/compiler/implementation/leg.dart
@@ -7,6 +7,7 @@
 #import('dart:uri');
 
 #import('colors.dart');
+#import('dart_backend/dart_backend.dart');

[ahe, 2012/06/04 10:38:42]

I think you need to add a prefix. It is correct that the SSA backend doesn't use
a prefix, but when we started this project, there was only one backend. Now that
there is two, it would be nice if they don't have to worry about name clashes.

[Anton Muhin, 2012/06/05 09:50:03]

Done.

 #import('elements/elements.dart');
 #import('native_handler.dart', prefix: 'native');
 #import('scanner/scanner_implementation.dart');