Auto Const Array

Use this macro to declare a const array without specifing its length.

use auto_const_array::auto_const_array;
auto_const_array! {
    // Additional attributes and docs are supported.
    /// Common array with public visibility.
    #[allow(unused)]
    pub const ARRAY_COMMON: [u8; _] = [1, 2, 4];
    /// Special array with cfg conditional compling.
    const ARRAY_WITH_ATTR: [u8; _] = [1, #[cfg(unix)] 2]
}