Does the new trait solver with 26-10-2025 version work with all Rust versions?

[Erik-Sovereign]

I still have to use Rust 1.75 but still use the newest Rust Analyzer version. If I update to the version of 26-10-2025, will my Rust still use the new trait solver?

[ChayimFriedman2]

We know there is at least one bug on older versions, see #20487. But generally, it should work with any version rust-analyzer supports.

[lnicola]

We sometimes drop support for older Rust versions, but I don't think it was the case in this release cycle. You can give it a try and downgrade if it doesn't work for you -- VS Code even has an option to install a specific version.

[ShoyuVanilla]

Yes, as Chayim said, there are some bugs but in theory, it mostly works.
Currently the minimum supported version is 1.78.0

rust-analyzer/crates/rust-analyzer/src/lib.rs

Lines 14 to 21 in 6155980

	/// Any toolchain less than this version will likely not work with rust-analyzer built from this revision.
	pub const MINIMUM_SUPPORTED_TOOLCHAIN_VERSION: semver::Version = semver::Version {
	major: 1,
	minor: 78,
	patch: 0,
	pre: semver::Prerelease::EMPTY,
	build: semver::BuildMetadata::EMPTY,
	};

[ShoyuVanilla]

Oh wait, you have 1.75.0 so things might be worse 😢

[Erik-Sovereign]

Unfortunately I need to have 1.75, yes.

But that's okay! I want to thank you for your fast answers, highly appreciated!

I will give the new version a try and downgrade if I need to.