✓ Restructure optimizer to be simpler and faster
✓ Rewrite in rust
✓ Rewrite algorithm to use syntax tree instead of flat vector
- Further optimizations
- Automated testing
✓ Add README file
- JIT
- Make optimizer mutate data and not recurse
- -O argument for optimization levels
- Document code better
- Brainfuck debugging symbols
  - Debugging in interpreter by printing tokens?
- Add indentation to asm output
- Support other backends (arm, llvm, etc)
- Directly generate machine code, eliminating assembler and linker?