error[E0597]: `arg` does not live long enough --> $DIR/issue-74050-end-span.rs:5:19 | LL | let _arg = match args.next() { | ---- borrow later stored here LL | Some(arg) => { | --- binding `arg` declared here LL | match arg.to_str() { | ^^^ borrowed value does not live long enough ... LL | } | - `arg` dropped here while still borrowed error: aborting due to previous error For more information about this error, try `rustc --explain E0597`.