When Ctrl+C doesn't exit the editor, you're gonna have a bad day 

Here's a video of my first 5 minutes of using ed(1). I'm writing a Hello, World program in Rust, but first I need to learn how to quit.
In case you want to see the script at home, this is what I ended up writing:
$ ed hello.rs
hello.rs: No such file or directory
a
fn main() {
println!("Hello, world");
}
^C
?
w
41
q
$ rustc hello.rs
$ ./hello
Hello, world
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