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Announcing Rust 1.89.0
(blog.rust-lang.org)
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this post was submitted on 07 Aug 2025
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Wait, so you say
res_res??gives more information thanres_res.flatten()?, do you?I mean, this is a very trivial case and not best suited for flatten at all, but the information is lost in exactly the same way
Yes. Note that I'm replying to this:
My point was that without flattening, "provide context and propagate" vs. "directly propagate" is always explicit and precise, and is obviously already supported and easy to do.
Use with functional chaining, as pointed out by others, wasn't lost on me either. I've been using
Option::flatten()for years already, because such considerations don't exist in that case.