Function fetch 

pub(crate) fn fetch(
    s: &Session,
    dirs: &Dirs,
    only: Option<&str>,
    progress: &mut dyn FnMut(&Progress),
    cancel: &Cancel,
) -> Result<Report, String>

The corpus brought up to date: every account that syncs, or one; each message checked by Sioul as it comes, then those kept before without checks. A Microsoft address only when named at the last press of Train now in the window (sioul_learn::consent), a work or school one never: whoever runs it (you, training by itself, an AI agent’s job). An account removed while it runs is left alone.