This repo is just an obvious and trivial joke about ed, which notoriously uses "?" for all error messages:<p><pre><code> let mut x = String::new();
loop {
io::stdin().read_line(&mut x)
.expect("?");
println!("?");
}
</code></pre>
It would actually be fun to implement ed in Rust—it's the best of of the popular low-bandwidth "line editors", with some nice support for regex-based search and replace. It's one of the few editors that could be a used with a slow line-by-line printer as the only output device.