//! Reap tmux servers left behind by abandoned test fixtures.
//!
//! A fixture cleans up after itself. One whose process was killed mid-run
//! cannot, and the daemon it leaves keeps a pseudo-terminal per pane. A
//! system has a few thousand, so enough abandoned runs and the next `fork`
//! fails with `No space left on device` somewhere unrelated.
//!
//! ```console
//! $ cargo run --example sweep --features test-support
//! ```
//!
//! Only this crate's own fixtures are considered, and only those whose owning
//! process is gone, so it is safe to run while tests are running.
use Duration;