rustc_data_structures/
captures.rs

1/// "Signaling" trait used in impl trait to tag lifetimes that you may
2/// need to capture but don't really need for other reasons.
3/// Basically a workaround; see [this comment] for details.
4///
5/// [this comment]: https://github.com/rust-lang/rust/issues/34511#issuecomment-373423999
6pub trait Captures<'a> {}
7
8impl<'a, T: ?Sized> Captures<'a> for T {}