There will Perl6 syle macros to allow the language to be modified to suit the users needs.
This would require that at least some of the code has to be runnable before it gets completely compiled. I would suspect that the compile time code will run at a much lower speed. I think that this would allow D style version( ) statements to be able to be included, without hard coding it into the parser.
I find that there are times were I want to change how the program is parsed, so that I can do the same thing to different types of data, without retypeing it. D does to some extent, provide these facilities, but I want to take it farther.
