generativity 1.2.1

Generation of unique invariant lifetimes
Documentation 
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// see cad97/generativity#13 and rust-lang/rust#78586
// if this fails in crater *please* ping me; I *want* this to not hit the lint!
#![deny(repr_transparent_external_private_fields)] // this should not trigger

use generativity::{Id, make_guard};

#[repr(transparent)]
pub struct BOption<'id, T>(Option<T>, Id<'id>); // this should work

fn main() {
    make_guard!(a);
    let _ = BOption(Some(0), a.into());
}