error: borrowed data escapes outside of closure --> $DIR/issue-7573.rs:32:9 | LL | let mut lines_to_use: Vec<&CrateId> = Vec::new(); | ---------------- `lines_to_use` is declared here, outside of the closure body LL | //~^ NOTE cannot infer an appropriate lifetime LL | let push_id = |installed_id: &CrateId| { | ------------ `installed_id` is a reference that is only valid in the closure body ... LL | lines_to_use.push(installed_id); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `installed_id` escapes the closure body here error: aborting due to previous error