Feature Request: NonZeroInt literal coersion

[Lucretiel]

It should be possible for an integer literal to initialize a NonZeroInt type, like NonZeroUsize. For instance, this should be legal:

struct Settings {
    // None means unlimited
    max_args: Option<NonZeroUsize>
}

let settings = Settings {
    max_args: Some(2),
}

The compiler can easily check whether the literal is zero and fail if it is.

While I know that the NonZero types are "just" regular structs, it seems as though they already have so many special compiler attributes attached to them to ensure that they work with Option correctly that it seems like it wouldn't be much of a stretch to have this one as well (though I'm happy to be corrected there).

[adrianheine]

There is a clever macro implementing this: https://docs.rs/nonzero_ext/latest/nonzero_ext/macro.nonzero.html

[zopsicle]

While I know that the NonZero types are "just" regular structs

There is now syntax for CStr literals. Thus, literals for non-primitive types are not inherently problematic.