remove `feature(never_type)` since it's stable since 1.41.0 (latest nightly)
#![allow(clippy::needless_doctest_main)]
#![allow(clippy::unit_arg)] // TODO
#![allow(clippy::ptr_arg)] // TODO
-#![cfg_attr(feature = "never-type", feature(never_type))]
#[macro_use]
extern crate derive_more;
