Re: Evolutionary User Strategy - A Compromise

[Graham Percival]

Erik Sandberg wrote:
> There's also the question of what you mean by compatibility: Very advanced 
> tweaks usually rely on the way lily's internals are organised, which may 
> change over time. Since lily contains a Turing-complete programming language, 
> for some language updates it is thereby _impossible_ to create a script that 
> upgrades _all_ .ly files perfectly.

Actually, doesn't this mean that we can _always_ upgrade _all_ .ly files 
perfectly?  Since lily contains a Turing-complete language, we just need 
to write a universal Turing machine which emulates the behavior of 2.4 
(or whatever).  Then convert-ly takes 2.4, adds our Turing machine, and 
presto, we have a .ly file which compiles under 2.8.

Of course, that .ly file is probably about 20 megabytes in size, and 
would take a huge amount of time to run... but it would work!  :)

Cheers,
- Graham