You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: sysroot.rs
    path of file: ./repos/rust-analyzer/crates/project-model/src
    
    the code of the file until where you have to start completion: //! Loads "sysroot" crate.
//!
//! One confusing point here is that normally sysroot is a bunch of `.rlib`s,
//! but we can't process `.rlib` and need source code instead. The source code
//! i
    
fn discover_sysroot_src_dir(sysroot_path: &AbsPathBuf) -> Option<AbsPathBuf> {
    if let Ok(path) = env::var("RUST_SRC_PATH") {
        if let Ok(path) = AbsPathBuf::try_from(path.as_str()) {
            let core = path.join("core");
            if fs::metadata(&core).is_ok() {
                tracing::debug!("Discovered sysroot by RUST_SRC_PATH: {path}");
                return Some(path);
            }
            tracing::debug!("RUST_SRC_PATH is set, but is invalid (no core: {core:?}), ignoring");
        } else {
            tracing::debug!("RUST_SRC_PATH is set, but is invalid, ignoring");
        }
    }

    get_rust_src(sysroot_path)
}