This is interesting, but I wouldn't say it is valid C. main() doesn't know about greet(auto s) and wouldn't be able to call it in valid C89, right?
To compile CScript to C:
apt install gcc-dev
cat hello.cs > hello.c
gcc hello.c
> 0[str] is valid and asserts dominance.
At this point I came dangerously close to spewing water all over my keyboard. :D
It looks like the B programming language.