Simple Brainfuck implementation in Rust

brainfuck.rs

fn main() {
    let program: Vec<char> = include_str!("../program.bf").chars().collect();
    let mut tape: Vec<u8> = vec![0]; //init with a zero because we only check cells on moves
    let mut tape_pointer = 0usize;
    let mut instruction_pointer = 0usize;
    let mut loop_stack: Vec<usize> = vec![];
    //let mut counter = 0usize;

    loop {
        match program[instruction_pointer] {
            '<' => if tape_pointer != 0 { tape_pointer -= 1; },
            '>' => {
                tape_pointer += 1;
                if tape.get(tape_pointer).is_none() {
                    tape.push(0);
                }
            },
            // We just eat integer overflows or underflows
            //'+' => tape[tape_pointer] = tape[tape_pointer].wrapping_add(1),
            //'-' => tape[tape_pointer] = tape[tape_pointer].wrapping_sub(1),
            '+' => if tape[tape_pointer] < u8::max_value() { tape[tape_pointer] += 1; },
            '-' => if tape[tape_pointer] > 0 { tape[tape_pointer] -= 1; },
            '.' => {
                print!("{}", (tape[tape_pointer] as u8) as char);
            },
            ',' => {
                println!("tried to input data, scrub.");
                break;
            },
            '[' => {
                loop_stack.push(instruction_pointer);
            },
            ']' => {
                if loop_stack.is_empty() {
                    println!("tried to ] when not in a loop.");
                    break;
                } else if tape[tape_pointer] != 0 {
                    instruction_pointer = *loop_stack.last().unwrap();
                } else {
                    loop_stack.pop();
                }
            },
            _ => {}
        }
        //println!("instruction {} at pos {} tapelen {} tapeptr {}", program[instruction_pointer], instruction_pointer, tape.len(), tape_pointer);
        //println!("{:?}", loop_stack);
        instruction_pointer += 1;
        if instruction_pointer >= program.len() {
            return;
        }
    }
}