More precisely, the BrainFuck-to-Rust transpiler using Rust proc macro

Cargo.toml

[dependencies]
bflib = "0.1.9"

use bflib::brain_fuck;

1. Hello World (run on dropping)

   brain_fuck!(
               [>    [>  >   >   > <<<<-]> > >->> [<]<-]>>.
       >---.       ..   .>>.<-.<.   .------.--------.>> .>  .
   );

2. using into method to obtain (pc: usize, mem: Vec<u8>) after running (run on into calling)

   let (pc, mem) = brain_fuck!(
               [> >    <<-]>  >> <[-[>> <<-] >>]> [
           -<<<[
               ->[ [-] >  >>>-<<]<[<]>>      [<<     >>-] <<  .[-]<<
           ]>.> [>>]> 
       ]
   ).into();
   println!("{:?}", (pc, mem));

3. use env method to set Program Counter pc and Memory mem for brainfuck codeblock (run on dropping)

   brain_fuck!(
       [.>]
   ).env(0, vec![79, 75, 10]);

4. Altogether (run on into calling)

   let (pc, mem) = brain_fuck!(
       [.>]
   ).env(0, vec![72, 101, 108, 108, 79, 119, 104, 97, 116, 65, 115, 10]).into();
   println!("{:?}", (pc, mem));