| //@ known-bug: #117696 | |
| fn main() { | |
| let mut it = (Empty); | |
| rec(&mut it); | |
| } | |
| struct Empty; | |
| impl Iterator for Empty { | |
| type Item = (); | |
| fn next<'a>(&'a mut self) -> core::option::Option<()> { | |
| None | |
| } | |
| } | |
| fn identity<T>(x: T) -> T { | |
| x | |
| } | |
| fn rec<T>(mut it: T) | |
| where | |
| T: Iterator, | |
| { | |
| if () == () { | |
| T::count(it); | |
| } else { | |
| rec(identity(&mut it)) | |
| } | |
| } |