Method unregister

crates/stdlib/src/select.rs:482–487

(&self, Fildes(fd): Fildes, vm: &VirtualMachine)

            #[pymethod]
            fn unregister(&self, Fildes(fd): Fildes, vm: &VirtualMachine) -> PyResult<()> {
                let removed = remove_fd(&mut self.fds.lock(), fd);
                removed
                    .map(drop)
                    .ok_or_else(|| vm.new_key_error(vm.ctx.new_int(fd).into()))
            }

            #[pymethod]
            fn poll(