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Announcing Rust 1.89.0 (blog.rust-lang.org)

submitted 6 days ago by nemeski@mander.xyz to c/rust@programming.dev

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[–] anton@lemmy.blahaj.zone 4 points 6 days ago (1 children)

You can already :
res_res??;

I think it's more for cases where you don't want to return, like

let new_res = old_res.map(func).flatten();

[–] sukhmel@programming.dev 4 points 6 days ago

This, it's not a thing that happens often, but there were a couple of times when flatten would've been handy

This was also usually a result of a chain of and_then that could do with some flattening. This could've been rewritten as a separate function to make use of ?, but it seems to be a bigger trouble than use