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      1 // Copyright (C) 2017-2024 Free Software Foundation, Inc.
      2 
      3 // This program is free software; you can redistribute it and/or modify
      4 // it under the terms of the GNU General Public License as published by
      5 // the Free Software Foundation; either version 3 of the License, or
      6 // (at your option) any later version.
      7 //
      8 // This program is distributed in the hope that it will be useful,
      9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
     10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     11 // GNU General Public License for more details.
     12 //
     13 // You should have received a copy of the GNU General Public License
     14 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
     15 
     16 #![allow(dead_code)]
     17 #![allow(unused_variables)]
     18 #![allow(unused_assignments)]
     19 
     20 struct V<T: ?Sized> {
     21     data: T,
     22 }
     23 
     24 type Unsized = V<[u8]>;
     25 
     26 fn ignore<T>(x: T) { }
     27 
     28 fn main() {
     29     let v: Box<V<[u8; 3]>> = Box::new(V { data: [1, 2, 3] });
     30     let us: Box<Unsized> = v;
     31     let v2 : Box<[u8; 3]> = Box::new([1, 2, 3]);
     32     let us2 : Box<[u8]> = v2;
     33 
     34     ignore(us);     // set breakpoint here
     35 }
     36