src/test/run-pass/trait-inheritance-static.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
  12 pub trait MyNum {
  13     fn from_int(isize) -> Self;
  14 }
  15
  16 pub trait NumExt: MyNum { }
  17
  18 struct S { v: isize }
  19
  20 impl MyNum for S {
  21     fn from_int(i: isize) -> S {
  22         S {
  23             v: i
  24         }
  25     }
  26 }
  27
  28 impl NumExt for S { }
  29
  30 fn greater_than_one<T:NumExt>() -> T { MyNum::from_int(1) }
  31
  32 pub fn main() {
  33     let v: S = greater_than_one();
  34     assert_eq!(v.v, 1);
  35 }