BrainFuck compiler using Rust proc macro

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

Examples:

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));