src/test/run-pass/issues/issue-5008-borrowed-traitobject-method-call.rs

   1 // Copyright 2013 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 // run-pass
  12 /*
  13
  14 #5008 cast to &Trait causes code to segfault on method call
  15
  16 It fixes itself if the &Trait is changed to @Trait.
  17 */
  18
  19 trait Debuggable {
  20     fn debug_name(&self) -> String;
  21 }
  22
  23 #[derive(Clone)]
  24 struct Thing {
  25     name: String,
  26 }
  27
  28 impl Thing {
  29     fn new() -> Thing { Thing { name: "dummy".to_string() } }
  30 }
  31
  32 impl Debuggable for Thing {
  33     fn debug_name(&self) -> String { self.name.clone() }
  34 }
  35
  36 fn print_name(x: &Debuggable)
  37 {
  38     println!("debug_name = {}", x.debug_name());
  39 }
  40
  41 pub fn main() {
  42     let thing = Thing::new();
  43     print_name(&thing as &Debuggable);
  44 }