Function breakpoint

crates/vm/src/stdlib/builtins.rs:663–671

(args: FuncArgs, vm: &VirtualMachine)

    #[pyfunction]
    fn breakpoint(args: FuncArgs, vm: &VirtualMachine) -> PyResult {
        match vm
            .sys_module
            .get_attr(vm.ctx.intern_str("breakpointhook"), vm)
        {
            Ok(hook) => hook.as_ref().call(args, vm),
            Err(_) => Err(vm.new_runtime_error("lost sys.breakpointhook")),
        }
    }

    #[pyfunction]
    fn hex(number: ArgIndex) -> String {