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The main remaining work on the RFC is to implement the `catch` construct. Here's the tracking issue: https://github.com/rust-lang/rust/issues/31436

However, stabilizing `?` is not blocked on any particular work as much as on the relevant team deciding its a good feature without big bugs that they are happy to see made permanent. Given that a minority of the community opposes `?` vehemently, this process will probably move slowly.

Personally, I opt into question mark in all of my nightly code and I absolutely love it. I had a case last night actually where I really wanted `catch` also.



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