That begs the question of exactly what "some issues" encompasses. To me, the poster was clearly complaining about the increased use of a particular code pattern post-Rust-2024, but it's not clear to me that they were also claiming that there is a proportional increase in deadlocks post-Rust-2024. For instance, perhaps it's the case that people use that code pattern more because it doesn't deadlock; this may not be desirable from the commenter's perspective due to the multiple locks/unlocks, but that's a distinct issue from lifetime extension causing deadlocks.
> Regarding "super let", it looks interesting, but I am not sure about the details of it.
At least from a cursory skim it looks like the specifics are still being worked on, so it's hard to fault you for being unsure about the details. It is an experiment after all :P