src/librustc/util/captures.rs

   1 // Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 /// "Signaling" trait used in impl trait to tag lifetimes that you may
  12 /// need to capture but don't really need for other reasons.
  13 /// Basically a workaround; see [this comment] for details.
  14 ///
  15 /// [this comment]: https://github.com/rust-lang/rust/issues/34511#issuecomment-373423999
  16 pub trait Captures<'a> { }
  17
  18 impl<'a, T: ?Sized> Captures<'a> for T { }