src/test/compile-fail/infinite-instantiation.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 // error-pattern: overly deep expansion
  12 // issue 2258
  13
  14 trait to_opt {
  15     fn to_option(&self) -> Option<Self>;
  16 }
  17
  18 impl to_opt for uint {
  19     fn to_option(&self) -> Option<uint> {
  20         Some(*self)
  21     }
  22 }
  23
  24 impl<T:Copy> to_opt for Option<T> {
  25     fn to_option(&self) -> Option<Option<T>> {
  26         Some(copy *self)
  27     }
  28 }
  29
  30 fn function<T:to_opt>(counter: uint, t: T) {
  31     if counter > 0u {
  32         function(counter - 1u, t.to_option());
  33     }
  34 }
  35
  36 fn main() {
  37     function(22u, 22u);
  38 }