src/test/compile-fail/feature-gate-may-dangle.rs

   1 // Copyright 2016 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 // Check that `may_dangle` is rejected if `dropck_eyepatch` feature gate is absent.
  12
  13 #![feature(generic_param_attrs)]
  14
  15 struct Pt<A>(A);
  16 impl<#[may_dangle] A> Drop for Pt<A> {
  17     //~^ ERROR may_dangle has unstable semantics and may be removed in the future
  18     //~| HELP add #![feature(dropck_eyepatch)] to the crate attributes to enable
  19     fn drop(&mut self) { }
  20 }