src/test/compile-fail/regions-trait-1.rs

   1 // Copyright 2012 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 #![feature(box_syntax)]
  12
  13 struct ctxt { v: usize }
  14
  15 trait get_ctxt {
  16     // Here the `&` is bound in the method definition:
  17     fn get_ctxt(&self) -> &ctxt;
  18 }
  19
  20 struct has_ctxt<'a> { c: &'a ctxt }
  21
  22 impl<'a> get_ctxt for has_ctxt<'a> {
  23
  24     // Here an error occurs because we used `&self` but
  25     // the definition used `&`:
  26     fn get_ctxt(&self) -> &'a ctxt { //~ ERROR method not compatible with trait
  27         self.c
  28     }
  29
  30 }
  31
  32 fn get_v(gc: Box<get_ctxt>) -> usize {
  33     gc.get_ctxt().v
  34 }
  35
  36 fn main() {
  37     let ctxt = ctxt { v: 22 };
  38     let hc = has_ctxt { c: &ctxt };
  39     assert_eq!(get_v(box hc as Box<get_ctxt>), 22);
  40 }