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If let chains were actually stabilized recently, and then unfortunately reverted shortly after because of a bug found in them. https://github.com/rust-lang/rust/pull/100538
There was an RFC for it that you could check.
You'll find elements of it on https://internals.rust-lang.org but there were also a few different RFCs proposed. I think the most mature proposal, which led to const generics, was The pi type trilogy; you'll see that the third part of the trilogy, Fully dependent pi types was postponed with the comment: