Nightly regression in borrow checker #28936
Description
pub type Session = i32;
pub struct StreamParser<'a, T> {
_tokens: T,
_session: &'a mut Session,
}
impl<'a, T> StreamParser<'a, T> {
pub fn thing(&mut self) -> bool { true }
}
pub fn parse_stream<T: Iterator<Item=i32>, U, F>(
_session: &mut Session, _tokens: T, _f: F) -> U
where F: Fn(&mut StreamParser<T>) -> U { panic!(); }
pub fn thing(session: &mut Session) {
let mut stream = vec!(1, 2, 3).into_iter();
let _b = parse_stream(session,
stream.by_ref(),
// replacing the above with the following fixes it
//&mut stream,
|p| p.thing());
}
fn main() {}
compiles on 1.3 stable and 1.4 beta but not on current nightly. It did compile on nightly 6e5a325. Replacing the .by_ref() in the call to parse_stream fixes it.
Potentially related to/a dupe of #28934.