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Update Rust toolchain #605
Description
Generics in latests nightlies with generic_const_args require const {} rather than {} in places like this:
atomic_i_increment::<_, { Scope::QueueFamily as u32 }, { Semantics::NONE.bits() }>(..)This makes writing code that compiles both with rust-gpu's old toolchain version and latest nightly very frustrating.
Please consider updating toolchain again some time soon 🙏
Activity
Firestar99 commentedon Jun 6, 2026
Just to confirm, is this an issue only with that rustc nightly feature flag active, which rust-gpu doesn't use? Isn't this then a regression in upstream rustc that activating that feature breaks existing rust code (which isn't surprising for a feature gate)?
Reading this I feel like you have enabled that nightly feature for your project, and it "works" on newer nightlies, but rust-gpu being and older nightly that feature breaks? And if we were to update to a newer nightly, we'd unblock you from using the feature in your code?
nazar-pc commentedon Jun 6, 2026
This is actually expected (for now), that it breaks existing code, see rust-lang/rust#157152 and #project-const-generics > Need help migrating from GCE to GCA @ 💬.
And while technically available as a feature in the version rust-gpu uses right now, it is even more hopelessly broken there, so it isn't really usable for me in that state.
Firestar99 commentedon Jun 8, 2026
Is #610 sufficiently up-to-date for you? I've just forward ported to a nightly around where rustc 1.97 branched.
nazar-pc commentedon Jun 8, 2026
Possibly, but it is actually very complicated.
I use
generic_const_exprsheavily and the last nightly (ever, it is on the way out) where it is not broken isnightly-2026-05-03.generic_const_args, which essentially is a successor, is still too broken even in the latest nightly (ICE inrustdocand other issues) to be usable for everything unconditionally.I'm not sure if it sufficiently not broken for non-
rustdocuse cases innightly-2026-05-22, I have seen some important fixes during last few weeks, so it is likely that I'll actually need nightly from June before I'll be able to upgraderust-gpu.Firestar99 commentedon Jun 9, 2026
Is today's nightly sufficiently up-to-date? :D #612
nazar-pc commentedon Jun 9, 2026
Yes, it should be. Thanks!
nazar-pc commentedon Jun 11, 2026
#610 was indeed sufficiently recent for my needs so far