git clone --recurse -b 1.48.0 https://github.com/rust-lang/rust.git cd rust ./x.py setup # Choose "d) Install Rust from source" ./x.py check 

$ cat config.toml # Includes one of the default files in src/bootstrap/defaults profile = "maintainer" $ ./x.py check Updating only changed submodules Submodules updated in 0.06 seconds Finished dev [unoptimized + debuginfo] target(s) in 0.13s thread 'main' panicked at 'fs::read_to_string(file) failed with No such file or directory (os error 2) ("`include` config not found")', src/bootstrap/config.rs:563:28 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace failed to run: /usr/local/google/home/maruel/src-oth/rust/build/bootstrap/debug/bootstrap check Build completed unsuccessfully in 0:00:00 $ ls src/bootstrap/defaults config.toml.codegen config.toml.compiler config.toml.library config.toml.user README.md