Public bug reported: The rust-pyo3 transition is stuck in questing-proposed because rust- breezyshim is using a feature from rustc 1.86 named "trait upcasting coercion".
Solution 0 ---------- Switch the default rustc for Ubuntu 25.10 from rustc-1.85 to rustc-1.86. This would require a Feature Freeze Exception and I don't think Foundations is interested in this proposal. Solution 1 ---------- Build breezyshim and rdepends with the non-default rustc 1.86 which is available in Ubuntu 25.10. I'm not sure how to do this. I think Julian did something like this once. I'm not sure if it's practical? Solution 2 ---------- Either use an older version of breezyshim that is both compatible with rust-pyo3 0.25 but doesn't use the rustc 1.86 code or replace the rustc 1.86 code with code compatible with rustc 1.85. I spent some time working on this. With the time I want to spend on this and my very basic rust skills, I wasn't able to get this to work. Solution 2 ---------- Remove rust-breezyshim from Ubuntu. This would also require removing its reverse dependencies: rust-debian-analyzer rust-ognibuild rust-upstream-ontologist silver-platter lintian-brush lintian-brush is a useful tool for improving .deb packages so I am reluctant to choose this option. Solution 3 ---------- Remove the incomplete rust-pyo3 transition from questing-proposed. Remove these packages from questing-proposed only: rust-breezyshim rust-deb822-derive rust-deb822-fast rust-deb822-lossless rust-debian-control rust-debian-copyright rust-debversion rust-dep3 rust-jiter rust-launchpadlib rust-lexical-parse-float rust-lexical-parse-integer rust-lexical-util rust-pyo3 rust-pyo3-async-runtimes rust-pyo3-async-runtimes-macros rust-pyo3-build-config rust-pyo3-ffi rust-pyo3-filelike rust-pyo3-log rust-pyo3-macros rust-pyo3-macros-backend rust-pythonize rust-r-description rust-wadl Then for the 26.04 development cycle, someone needs to make sure these packages come back into -proposed. References ---------- https://launchpad.net/ubuntu/+source/rust-breezyshim/0.6.4-1ubuntu1/+latestbuild/amd64 https://github.com/rust-lang/lang-team/issues/98 Other Info ---------- Earlier this year, Archive Admins removed the tree-sitter transition from plucky-proposed and plucky NEW since it was after Feature Freeze and it was decided it was better to not complete the transition and try to keep -proposed as uncluttered as possible. Conclusion ---------- I recommend Solution 3. Handling this issue is helpful to reduce time spent on +1 maintenance by people trying to get this stack to migrate out of questing-proposed. ** Affects: rust-pyo3 (Ubuntu) Importance: Undecided Status: New ** Tags: ftbfs update-excuse -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2122135 Title: Remove incomplete rust-pyo3 transition from questing-proposed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rust-pyo3/+bug/2122135/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
