Compile Protection

This crate defines a single macro that is a brainfunct compile-time interpreter. One example is as follows

#![recursion_limit = "18446744073709551615"]
#![feature(const_mut_refs)]

use program_protected_compile::brainfunct_protect;

fn main() {
    brainfunct_protect!("/,./+@", "1", "1");
}

brainfunct_protect! generates const functions that can be consumed at compile time to run the brain funct program with the provided input "1", and it expects the output "1".

The syntax is as follows:

brainfunct_protect!(
    "brainfunct legal program", 
    "input to give to the program", 
    "the output to expect from the program"
);

If the program given the input produces the given output, then the rest of the rust program will compile. However, if the program produces the incorrect output, it will recursively loop infinitely or until the user cancels the compile.

This is trivial to beat if there is nothing keeping them from deleting the macro from the source. But is nontrivial otherwise.

The recursion limit being set so high prevents the recursive const functions that are being generated from accidentally going over the recursion limit.