src/test/run-pass/dst-index.rs

   1 // Copyright 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 // Test that overloaded index expressions with DST result types
  12 // work and don't ICE.
  13
  14 use std::ops::Index;
  15 use std::fmt::Debug;
  16
  17 struct S;
  18
  19 impl Index<uint> for S {
  20     type Output = str;
  21
  22     fn index<'a>(&'a self, _: &uint) -> &'a str {
  23         "hello"
  24     }
  25 }
  26
  27 struct T;
  28
  29 impl Index<uint> for T {
  30     type Output = Debug + 'static;
  31
  32     fn index<'a>(&'a self, idx: &uint) -> &'a (Debug + 'static) {
  33         static X: uint = 42;
  34         &X as &(Debug + 'static)
  35     }
  36 }
  37
  38 fn main() {
  39     assert_eq!(&S[0], "hello");
  40     &T[0];
  41     // let x = &x as &Debug;
  42 }