Function end_quietly 

pub fn end_quietly()

Adds the panic hook: a print to a closed pipe ends the process with the exit 0, and prints nothing. Call it at the start of main of a command that ends by itself, never of a server: the hook ends the whole process from each thread.

riff_core::pipe::end_quietly();
for n in 0..1000 {
    println!("{n}"); // `| head -1` ends the process quietly here.
}