Various refcount overflows also abort: mpmc, Arc, Rc: https://doc.rust-lang.org/src/alloc/rc.rs.html#2628 https://doc.rust-lang.org/src/alloc/rc.rs.html#2628 I

Various refcount overflows also abort: mpmc, Arc, Rc: https://doc.rust-lang.org/src/alloc/rc.rs.html#2628 https://doc.rust-lang.org/src/alloc/rc.rs.html#2628 I think we're lucky the usual "aha rust isn't so safe after all, checkmate rustaceans!" crowd hasn't run into these aborts yet, because they won't have any kind of debugging spew so are not very friendly. You have to intentionally leak refcounts to hit these aborts or else you first run out of memory just storing the pointers; but then again, intentionally leaking things is just the sort of thing the anti-rust crowd is likely to try.