cargo run
error: failed to parse manifest at `/Users/xgqfrms-mbp/Documents/GitHub/rust-in-action/test/first_rust_library/Cargo.toml`
Caused by:
failed to parse the `edition` key
Caused by:
this version of Cargo is older than the `2022` edition, and only supports `2015`, `2018`, and `2021` editions.