Function handle_rustc_crates 

fn handle_rustc_crates(
    crate_graph: &mut CrateGraphBuilder,
    proc_macros: &mut ProcMacroPaths,
    pkg_to_lib_crate: &mut FxHashMap<Package, CrateBuilderId>,
    load: FileLoader<'_>,
    rustc_workspace: &CargoWorkspace,
    cargo: &CargoWorkspace,
    public_deps: &SysrootPublicDeps,
    libproc_macro: Option<CrateBuilderId>,
    pkg_crates: &FxHashMap<Package, Vec<(CrateBuilderId, TargetKind)>>,
    cfg_options: &CfgOptions,
    override_cfg: &CfgOverrides,
    build_scripts: &WorkspaceBuildScripts,
    crate_ws_data: Arc<CrateWorkspaceData>,
    cargo_path: &Utf8Path,
)