Lang/RfL meeting 2025-07-16

--- title: "Lang/RfL meeting 2025-07-16" tags: ["T-lang", "design-meeting", "minutes"] date: 2025-07-16 discussion: https://rust-lang.zulipchat.com/#narrow/channel/410673-t-lang.2Fmeetings/topic/RfL.20meeting.202025-07-16/ url: https://hackmd.io/Aied1ozOQ0ii9JVepCDrtw --- # Lang/RfL meeting 2025-07-16 ## Attendance People: TC, tmandry, Miguel, Alice Ryhl, BennoLossin, Boqun Feng, Gary Guo, Josh Triplett, Wesley Wiser, Xiang ## 2025H2 project goals Language goals: https://hackmd.io/5giQebPEROKWzxoB78lVIQ Tyler: Ding, do you see any possibility of getting arbitrary_self_types and derive_coerce_pointee without `Deref: Receiver`? Xiang: Seems unlikely; we are blocked on the new trait solver for a workaround. https://github.com/rust-lang/rust/pull/138952 Compiler goals: https://hackmd.io/3HtawTviT3-u6dbdmfVhrA Tyler: Is the standard for stability of compiler flags higher than it needs to be for users that drive rustc directly? Wesley: There has been some hesitation to stabilize flags without a wider story for how they can be deployed to the broader Rust community. We are working on ways to solve this from two different angles. With build-std work it looks like we are close to figuring this out. Similar for target-features. Alice: Out of curiosity, how is build-std progressing? Wesley: There is a pre-RFC being shopped around. It's very large. It has an extensive plan, but the current feedback is that it's too large for an MVP. I can share if anyone is interested. ## Ongoing work updates Ding: We have a [Pre-RFC](https://hackmd.io/@rust-for-linux-/SkucBLsWxl) for the supertrait-item-in-subtrait-impl work. I would need to add two modifications to the RFC to incorporate the requests in the comment `t-lang` thread. ## Tracking [Tracking issue](https://github.com/rust-lang/rust-project-goals/issues/116) ## For next time Miguel: Might want something like consteval: Functions that can only run at compile time. Not very urgent. Tyler: That sounds related to the second half of this project goal: https://github.com/rust-lang/rust-project-goals/pull/311 Miguel: Also, cfgs in core came up again so we can disable certain items there (?)