src/test/ui/inference/issue-36053.rs

   1 // run-pass
   2 // Regression test for #36053. ICE was caused due to obligations being
   3 // added to a special, dedicated fulfillment cx during a
   4 // probe. Problem seems to be related to the particular definition of
   5 // `FusedIterator` in std but I was not able to isolate that into an
   6 // external crate.
   7
   8 use std::iter::FusedIterator;
   9
  10 struct Thing<'a>(#[allow(unused_tuple_struct_fields)] &'a str);
  11 impl<'a> Iterator for Thing<'a> {
  12     type Item = &'a str;
  13     fn next(&mut self) -> Option<&'a str> {
  14         None
  15     }
  16 }
  17
  18 impl<'a> FusedIterator for Thing<'a> {}
  19
  20 fn main() {
  21     Thing("test").fuse().filter(|_| true).count();
  22 }