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    //! Runtime services
    //!
    //! The `rt` module provides a narrow set of runtime services,
    //! including the global heap (exported in `heap`) and unwinding and
    //! backtrace support. The APIs in this module are highly unstable,
    //! and should be considered as private implementation details for the
    //! time being.

    #![unstable(feature = "rt",
                reason = "this public module should not exist and is highly likely \
                          to disappear",
                issue = "0")]
    #![doc(hidden)]

    // Re-export some of our utilities which are expected by other crates.
    pub use crate::panicking::{begin_panic, begin_panic_fmt, update_panic_count};

    // To reduce the generated code of the new `lang_start`, this function is doing
    // the real work.
    #[cfg(not(test))]
    fn lang_start_internal(main: &(dyn Fn() -> i32 + Sync + crate::panic::RefUnwindSafe),
                           argc: isize, argv: *const *const u8) -> isize {
        use crate::panic;
        use crate::sys;
        use crate::sys_common;
        use crate::sys_common::thread_info;
        use crate::thread::Thread;

        sys::init();

        unsafe {
            let main_guard = sys::thread::guard::init();
            sys::stack_overflow::init();

            // Next, set up the current Thread with the guard information we just
            // created. Note that this isn't necessary in general for new threads,
            // but we just do this to name the main thread and to give it correct
            // info about the stack bounds.
            let thread = Thread::new(Some("main".to_owned()));
            thread_info::set(main_guard, thread);

            // Store our args if necessary in a squirreled away location
            sys::args::init(argc, argv);

            // Let's run some code!
            #[cfg(feature = "backtrace")]
            let exit_code = panic::catch_unwind(|| {
                sys_common::backtrace::__rust_begin_short_backtrace(move || main())
            });
            #[cfg(not(feature = "backtrace"))]
            let exit_code = panic::catch_unwind(move || main());

            sys_common::cleanup();
            exit_code.unwrap_or(101) as isize
        }
    }

    #[cfg(not(test))]
    #[lang = "start"]
    fn lang_start<T: crate::process::Termination + 'static>
        (main: fn() -> T, argc: isize, argv: *const *const u8) -> isize
    {
        lang_start_internal(&move || main().report(), argc, argv)
    }

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