Don't tell users to use a nightly flag on the stable channel #84055
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When a crate requires a newer edition, currently rustc tells users to use
-Z unstable-options
. This is not ideal, because:This flag doesn't work on the stable channel, so solution to one error only causes another error, which is frustrating.
Directs users towards the nightly channel, which is not necessarily the correct solution. Once the next edition is released, this message will be mostly seen by users of out-of-date stable Rust versions who merely need to update their Rust to the latest stable.