Printing the execution time of a Rust expression

fn main() {
  let start = Instant::now();
  // do stuff here
  // in toast, we do async work here using async_std and block_on
  eprintln!("Toast executed in {:?}", start.elapsed());
}

$ toast incremental .
Running toast with overridden binary path: /Users/chris/github/toastdotdev/toast/target/release/toast
▪▪▪ [14s] 323 pages created
▪▪▪ [3s] 323/323 remote sources compiled
▪▪▪ [2s] html rendered
Toast executed in 21.192417461s