What is this?

When you run either cargo check or cargo build, rustc will eat your memory rapidly until you run out (only tested up to about 32GB)

How?

In Cargo.toml, add the following dependency

tokio = { version = "1.2.0", features = ["macros"] }

in src/main.rs, have the following

#[tokio::main]
async fn main() {
    let _backslash_space = "\ ";
}