Systemd now supports writing programs in Rust as an alternative to C. While the core systemd library remains in C, specific systemd programs can be developed using Rust. A new utility, systemd-keyring-setup, showcases this by being written in Rust to manage keyrings and certificates during boot. This rust-based code is not yet merged but is expected soon. Developers are not porting existing C code to Rust. Rust code for systemd is built using Meson, not Cargo. C linkage is the only permitted interaction. Rust components are slightly larger than their C counterparts. For instance, a test program in Rust is 32KB, compared to 20KB in C. Currently, systemd's Rust support is optional and controlled by a Meson build option.