ports/opt (3.6): [notify] rust-bin: 1.52.0 -> 1.52.1 The Rust team has prepared a new release, 1.52.1, working around a bug in incremental compilation which was made into a compiler error in 1.52.0. We recommend all Rust users, including those currently using stable versions prior to 1.52.0, upgrade to 1.52.1 or disable incremental compilation. https://blog.rust-lang.org/2021/05/10/Rust-1.52.1.html