Creating a Rust hello world in 0x a presses.

README.md

This is a Rust "Hello World" program in 0x A presses.

$ vim hello.rs
$ rustc --test hello.rs
$ ./hello --quiet
Hello, World!

If you don't know, [the A Button Challenge] is a Mario 64 speedrun category in which runners attempt to use the A button (the jump button!) as few times as possible. Make sure you watch the classic Watch for Rolling Rocks - 0.5x A Presses video linked above in order to understand.

This project is TJ "Henry" Yoshi approved:

Nice - TJ "Henry" Yoshi (@tj99er) https://twitter.com/tj99er/status/1185701669696204800

hello.rs

use std::io::Write;

#[test]
fn hello() {
    // Ensure we don't need to use the compiler option to
    // show the test output, which uses the forbidden letter.
    let mut out = std::fs::File::open("/dev/stdout").expect("stdout");
    // Overwrite the undesired output to hide it.
    write!(out, "\x1b[2\x41
                           \x1b[1\x41\r").expect("reset");
    // Lets print! We need to use expect since the other
    // one uses the letter which is not permitted.
    writeln!(out, "Hello, World!").expect("write");
    // Exit not so the test runner doesn't print more output.
    std::process::exit(0);
}