src/test/run-pass/issue-36053.rs

   1 // Copyright 2016 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 // Regression test for #36053. ICE was caused due to obligations being
  12 // added to a special, dedicated fulfillment cx during a
  13 // probe. Problem seems to be related to the particular definition of
  14 // `FusedIterator` in std but I was not able to isolate that into an
  15 // external crate.
  16
  17 #![feature(fused)]
  18 use std::iter::FusedIterator;
  19
  20 struct Thing<'a>(&'a str);
  21 impl<'a> Iterator for Thing<'a> {
  22     type Item = &'a str;
  23     fn next(&mut self) -> Option<&'a str> {
  24         None
  25     }
  26 }
  27
  28 impl<'a> FusedIterator for Thing<'a> {}
  29
  30 fn main() {
  31     Thing("test").fuse().filter(|_| true).count();
  32 }