error[E0658]: `let...else` statements are unstable

[vizvasrj]

error[E0658]: let...else statements are unstable
I am compiling rust analyzer and here it cause some problem
https://rust-analyzer.github.io/manual.html#building-from-source

└─# cargo xtask install                                                        1 ⨯
    Finished dev [unoptimized] target(s) in 0.26s
     Running `target/debug/xtask install`
$ cargo install --path crates/rust-analyzer --locked --force --features force-always-assert
  Installing rust-analyzer v0.0.0 (/root/Project/whatsapp-webhook/myrust/rust-analyzer/crates/rust-analyzer)
    Updating crates.io index
   Compiling ide v0.0.0 (/root/Project/whatsapp-webhook/myrust/rust-analyzer/crates/ide)
error[E0658]: `let...else` statements are unstable
  --> crates/ide/src/rename.rs:43:13
   |
43 | /             let Some(frange) = sema.original_range_opt(name_like.syntax()) else {
44 | |                 bail!("No references found at position");
45 | |             };
   | |______________^
   |
   = note: see issue #87335 <https://github.com/rust-lang/rust/issues/87335> for more information

For more information about this error, try `rustc --explain E0658`.
error: could not compile `ide` due to previous error
error: failed to compile `rust-analyzer v0.0.0 (/root/Project/whatsapp-webhook/myrust/rust-analyzer/crates/rust-analyzer)`, intermediate artifacts can be found at `/root/Project/whatsapp-webhook/myrust/rust-analyzer/target`
Error: install server

Caused by:
    command exited with non-zero code `cargo install --path crates/rust-analyzer --locked --force --features force-always-assert`: 101

[lnicola]

You need to use the latest stable toolchain.

[jhgg]

You need to use the latest stable toolchain.

I wonder if we should include a rust-toolchain file in r-a git repo, so that cargo will automatically select the correct tool chain to build against?

[lnicola]

There's a rust-version clause in the manifests, it just wasn't updated (just like a rust-toolchain.toml might not be). And I personally dislike the latter.

[Veykril]

Ye we should just try to update the rust-version when a new release happens, I am not fond of a rust-toolchain file either

[jhgg]

I am curious why are you not fond of the tool chain file?

[lnicola]

I used to accumulate outdated toolchains installed by projects that were using them. That's fine for nightlies, but I don't see how it's better than the rust-version field (we're also using the 2021 edition, so a cargo that doesn't know about rust-version won't know about the edition either).