On [this page](https://docs.rust-embedded.org/book/start/qemu.html) there are several references to .cargo/config, https://github.com/rust-embedded/cortex-m-quickstart/commit/67b9c7c404b02ffe804c6f4c5600a21ca3a4502e recently changed the name of those files so the book examples lead to errors.
On this page there are several references to .cargo/config, rust-embedded/cortex-m-quickstart@67b9c7c recently changed the name of those files so the book examples lead to errors.