beyond treelang...

[Jason House]

Where can I find (minimally complex) examples of functionality that are 
not in treelang?

Items that I noticed to be lacking from treelang:
Loops 
        (probably covered through careful examination of the if statement)
#include/import
User defined types/structures
Functional programming
        (does this exist anywhere in gcc?)
Templates and generic programming support
        (I assume the only way will be to dive head first into cp?)
Anything else that I didn't list?