Posted on September 07, 2021 mustang is a system for writing Rust programs entirely in Rust, meaning they don't use libc, crt1.o, or any C code. It's experimental, but it's complete enough to run a std-using Hello World and other simple programs on Linux on x86-64, x86, and aarch64. See mustang's README for information on how to use it. This post walks through the major steps leading to this point