ICE with conservative_impl_trait #48140
Description
error: internal compiler error: src\librustc_typeck\check\mod.rs:634: escaping regions in predicate Obligation(predicate=Binder(ProjectionPredicate(ProjectionTy { substs: Slice([_]), item_def_id: DefId { krate: CrateNum(2), index: DefIndex(0:1693) => core[c2b0]::iter[0]::iterator[0]::Iterator[0]::Item[0] } }, &std::rc::Rc<track::Track>)),depth=0)
--> src\song.rs:21:38
|
21 | pub fn tracks_iter(&mut self) -> impl Iterator<Item = &Rc<Track>>{
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports
note: rustc 1.23.0 (766bd11c8 2018-01-01) running on x86_64-pc-windows-msvc
thread 'rustc' panicked at 'Box<Any>', src\librustc_errors\lib.rs:418:8
note: Run with `RUST_BACKTRACE=1` for a backtrace.
error: Could not compile `hello_world_1`.
Attaching project as-is.
RustHelloWorld1.zip