T-compiler Backlog Bonanza
Meeting proposal: https://github.com/rust-lang/compiler-team/issues/484
Potential seed query: https://github.com/rust-lang/rust/issues?page=2&q=is%3Aopen+is%3Aissue+label%3AC-tracking-issue±label%3AT-libs-api±label%3AT-libs±label%3AT-lang±label%3AT-rustdoc
Labels:
- S-tracking-ready-to-stabilize: Needs a stabilization PR (good to go
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- S-tracking-needs-to-bake: Needs time to bake (set a date? other criteria?)
- S-tracking-impl-incomplete: Not code complete or blocking bugs
- S-tracking-unimplemented: Implementation not begun
- S-tracking-design-concerns: Blocking design concerns
- This might be "doesn't quite seem to deliver value we hoped for" or "something doesn't feel right"
- S-tracking-perma-unstable
- Internal implementation detail of rustc, stdlib
- S-tracking-needs-summary
Note: Old processed items are at the bottom
Issues processed in meeting
Processed on 2022-10-21
"Tracking Issue for #![feature(const_impl_trait)]
" rust#77463
Link: https://github.com/rust-lang/rust/issues/77463
"Tracking Issue for -Z codegen-backend" rust#77933
Link: https://github.com/rust-lang/rust/issues/77933
Link: https://github.com/rust-lang/rust/issues/78251
"Tracking Issue for #![feature(pub_macro_rules)]
" rust#78855
Link: https://github.com/rust-lang/rust/issues/78855
"Tracking Issue for LLVM InstrProf code coverage (current flag: -Zinstrument-coverage
)" rust#79121
Link: https://github.com/rust-lang/rust/issues/79121
"Tracking issue for deprecation lint legacy_derive_helpers
" rust#79202
Link: https://github.com/rust-lang/rust/issues/79202
"Tracking Issue for user-provided classnames in fenced code blocks" rust#79483
Link: https://github.com/rust-lang/rust/issues/79483
"Tracking Issue for Non-Lexical Constant Propagation" rust#80038
Link: https://github.com/rust-lang/rust/issues/80038
"Tracking Issue for const_refs_to_cell
" rust#80384
Link: https://github.com/rust-lang/rust/issues/80384
"Tracking issue for only producing .xz on CI" rust#80753
Link: https://github.com/rust-lang/rust/issues/80753
"Tracking Issue for {BTreeMap,BTreeSet}::drain" rust#81074
Link: https://github.com/rust-lang/rust/issues/81074
"[rustdoc-json] Output is currently under-tested" rust#81359
Link: https://github.com/rust-lang/rust/issues/81359
"Tracking Issue for the C-cmse-nonsecure-call ABI" rust#81391
Link: https://github.com/rust-lang/rust/issues/81391
"Tracking Issue for linking modifiers for native libraries " rust#81490
Link: https://github.com/rust-lang/rust/issues/81490
"Tracking Issue for mir-inlining" rust#81567
Link: https://github.com/rust-lang/rust/issues/81567
"Tracking issue for forbidden_lint_groups
" rust#81670
Link: https://github.com/rust-lang/rust/issues/81670
"Follow-up work for download-rustc
" rust#81930
Link: https://github.com/rust-lang/rust/issues/81930
"Tracking Issue for -Z macro-backtrace
" rust#82068
Link: https://github.com/rust-lang/rust/issues/82068
"Tracking Issue for #[repr(align(...))]
on function items (fn_align)" rust#82232
Link: https://github.com/rust-lang/rust/issues/82232
"Tracking Issue for RFC 3013: Checking conditional compilation at compile time" rust#82450
Link: https://github.com/rust-lang/rust/issues/82450
"Tracking Issue for future-incompatibility warning unaligned_references
" rust#82523
Link: https://github.com/rust-lang/rust/issues/82523
"Tracking Issue for -Z normalize-docs
" rust#82692
Link: https://github.com/rust-lang/rust/issues/82692
"Tracking Issue for proc_macro_back_compat
" rust#83125
Link: https://github.com/rust-lang/rust/issues/83125
"Tracking Issue for must_not_suspend
lint (RFC #3014)" rust#83310
Link: https://github.com/rust-lang/rust/issues/83310
"Tracking Issue for large_assignments
lint" rust#83518
Link: https://github.com/rust-lang/rust/issues/83518
"Tracking Issue for -C export-executable-symbols
" rust#84161
Link: https://github.com/rust-lang/rust/issues/84161
"Tracking issue for function attribute #[no_coverage]
" rust#84605
Link: https://github.com/rust-lang/rust/issues/84605
"Tracking Issue for -Z terminal-width
" rust#84673
Link: https://github.com/rust-lang/rust/issues/84673
"Tracking Issue for rustdoc --test-run-directory
" rust#84674
Link: https://github.com/rust-lang/rust/issues/84674
"Tracking Issue for GenericArg::Infer" rust#85077
Link: https://github.com/rust-lang/rust/issues/85077
"Tracking Issue for async {}
blocks in const expressions" rust#85368
Link: https://github.com/rust-lang/rust/issues/85368
Link: https://github.com/rust-lang/rust/issues/85658
"Tracking Issue for RFC 3107: derive_default_enum" rust#87517
Link: https://github.com/rust-lang/rust/issues/87517
"Tracking Issue for for
-loops in constants" rust#87575
Link: https://github.com/rust-lang/rust/issues/87575
"Tracking issue for UNSUPPORTED_CALLING_CONVENTIONS
future compatibility lint" rust#87678
Link: https://github.com/rust-lang/rust/issues/87678
"Tracking issue for RFC 3119: Rust-lang crate ownership policy" rust#88867
Link: https://github.com/rust-lang/rust/issues/88867
"Tracking Issue for -Z remap-cwd-prefix
" rust#89434
Link: https://github.com/rust-lang/rust/issues/89434
"Tracking Issue for LLVM Control Flow Integrity (CFI) Support for Rust" rust#89653
Link: https://github.com/rust-lang/rust/issues/89653
"Tracking Issue for -Z no-unique-section-names
" rust#90275
Link: https://github.com/rust-lang/rust/issues/90275
"Tracking Issue for Associated Const Equality" rust#92827
Link: https://github.com/rust-lang/rust/issues/92827
"Tracking Issue for const offset_from (const_ptr_offset_from)" rust#92980
Link: https://github.com/rust-lang/rust/issues/92980
"Tracking Issue for asm_const" rust#93332
Link: https://github.com/rust-lang/rust/issues/93332
"Tracking Issue for asm_sym" rust#93333
Link: https://github.com/rust-lang/rust/issues/93333
"Tracking Issue for asm_unwind" rust#93334
Link: https://github.com/rust-lang/rust/issues/93334
"Tracking Issue for asm_experimental_arch" rust#93335
Link: https://github.com/rust-lang/rust/issues/93335
"Tracking Issue for const_fn_trait_bound
" rust#93706
Link: https://github.com/rust-lang/rust/issues/93706
"Tracking Issue for control-flow enforcement technology (CET)" rust#93754
Link: https://github.com/rust-lang/rust/issues/93754
"Tracking Issue for used_with_arg
" rust#93798
Link: https://github.com/rust-lang/rust/issues/93798
"Tracking Issue for post #89862 cleanup" rust#94483
Link: https://github.com/rust-lang/rust/issues/94483
Processed issues (2022-03-04 meeting)
Meeting record (zulip archive)
"Implement where clauses" rust#17657
Link: https://github.com/rust-lang/rust/issues/17657
Tagged S-tracking-impl-incomplete, S-tracking-unimplemented, T-lang
"Parse and accept type equality constraints in where clauses" rust#20041
Link: https://github.com/rust-lang/rust/issues/20041
Tagged S-tracking-design-concerns,
"Tracking issue for Consistent no-prelude attribute (RFC 501)" rust#20561
Link: https://github.com/rust-lang/rust/issues/20561
tag with S-tracking-design-concerns, and fcp close
"Tracking issue for FastISel" rust#26600
Link: https://github.com/rust-lang/rust/issues/26600
Not a tracking issue, untagging. Also close?
"Projections, lifetimes, and WF tracking issue (RFC 1214)" rust#27579
Link: https://github.com/rust-lang/rust/issues/27579
label +T-lang +WG-traits +S-tracking-needs-summary
"Tracking issue for Allow a re-export for main
(RFC 1260)" rust#28937
Link: https://github.com/rust-lang/rust/issues/28937
+T-lang +I-lang-nominated
"Create a benchmark suite for uncovering runtime regressions" rust#31265
Link: https://github.com/rust-lang/rust/issues/31265
Close/move to rustc-perf repo
"Tracking issue for #[link(kind)] connecting libraries on Windows" rust#37403
Link: https://github.com/rust-lang/rust/issues/37403
+S-tracking-needs-summary
"debuginfo: How to (ideally) represent reference and pointer types in DWARF" rust#37504
Link: https://github.com/rust-lang/rust/issues/37504
Not a tracking issue
"Tracking issue to stabilize –print target-spec-json" rust#38338
Link: https://github.com/rust-lang/rust/issues/38338
-T-dev-tools +T-compiler +S-tracking-design-concerns
Processed issues (2022-03-18 meeting)
Link: https://github.com/rust-lang/rust/issues/38789
- pnkfelix left comment. Marked S-tracking-needs-summary
"Tracking issue for MIR-only RLIBs" rust#38913
Link: https://github.com/rust-lang/rust/issues/38913
- Does this really classify as a tracking issue? Should probably track implementation, but needs a direction, I think. - Jack
- pnkfelix is leaving this on our queue to get visibility; eddyb had very interesting thoughts on doing this just for libcore through libstd to improve rustc development cycle time.
- Discussed in meeting. We decided that this is at best S-tracking-unimplemented, but it also just represents an experimental idea that was being floated around, not something that anyone committed to.
- pnkfelix left comment saying that this needs an MCP, not a tracking issue, and closed.
"Tracking issue for resolve_trait_on_defaulted_unit
compatibility lint" rust#39216
Link: https://github.com/rust-lang/rust/issues/39216
- This has a blocking bug #51125
- pnkfelix left comment and tagged as S-tracking-impl-incomplete due to the blocking bug.
"Tracking issue for sanitizer support" rust#39699
Link: https://github.com/rust-lang/rust/issues/39699
- pnkfelix left comment and tagged as S-tracking-needs-summary.
- wesley also noted that there may be design concerns; they said they would follow up async on issue with that, and tag as necessary.
"Tracking issue for 1.0.0 tracking issues" rust#39954
Link: https://github.com/rust-lang/rust/issues/39954
- Are these "meta" tracking issues helpful? I ticked off the checkboxes where the linked issue is closed. - Jack
- meeting attendees agreed that a meta-tracking issue like this isn't as useful anymore, especially given that we are now doing things like the backlog bonanzas to work through the old issue queue.
- pnkfelix left comment and closed.
Link: https://github.com/rust-lang/rust/issues/40460
- Maybe reclassify as T-devtools? Or just close this in favor of specific issues. - Jack
- meeting attendees agreed that an ever growing wish list of desired features is not a good tracking issue. (It will never get closed.)
- better to have an established set of goals in an issue, and open up new issues with new goals.
- pnkfelix left comment and closed
"Tracking issue for the thiscall
calling convention" rust#42202
Link: https://github.com/rust-lang/rust/issues/42202
- There is a comment for stabilization, but also a question of duplication of a everything but the abi for a function.
- Wesley noted that this needs more tests; there were signs as of 6 months ago that the feature was broken on LLVM's side, w.r.t. name mangling, and nothing on the rustc test suite had to be updated accordingly, which to Wesley indicates that the test coverage is insufficient.
- pnkfelix had several concerns, mostly reflecting the points raised in comment thread of issue
- but, allowing macro expansion in for the ABI in
extern ABI
might be a reasonable way to work-around the concerns raised there.
- pnkfelix left a comment and tagged as S-tracking-design-concerns (w.r.t. the code duplication issue that was raised) and S-tracking-needs-summary (w.r.t. current lint behavior vs other similar ABI variations).
"underscore_literal_suffix
future-compatibility warnings" rust#42326
Link: https://github.com/rust-lang/rust/issues/42326
- Underscores after float literals have been an error since May 2017; underscore after string literal has been warn since then. Can probably change underscore after string literal to deny-by-default.
- team discussed options here: either do a crater run (with upgrade to hard error), or rewrite as proper lint
- pnkfelix left comment outlining options and tagged as S-tracking-needs-to-bake
Processed items
Pre-processed issues (prior to 2022-03-17 meeting)
"Tracking issue for the "ptx-kernel" ABI" rust#38788
Link: https://github.com/rust-lang/rust/issues/38788
- pnkfelix left comment. Marked S-tracking-design-concerns and S-tracking-needs-summary
Pre-processed issues (prior to XX)
"In-band lifetimes: Lint against single-use lifetime names" rust#44752
Link: https://github.com/rust-lang/rust/issues/44752
- jackh726 left comment. Marked S-tracking-impl-incomplete.
"tracking issue for the Traits Working Group" rust#48416
Link: https://github.com/rust-lang/rust/issues/48416
- jackh726 left comment and closed.
"tracking issue for lifetime inference error work (E0495)" rust#42516
Link: https://github.com/rust-lang/rust/issues/42516
- There are still linked issues that are open. It's not clear that having this issue open is helpful. -Jack
- left comment and closed -pnkfelix
"Tracking issue for -Z profile
" rust#42524
Link: https://github.com/rust-lang/rust/issues/42524
- Changed to T-compiler from T-dev-tools and added S-tracking-needs-summary
"Reconsider using SVH for loading transitive crate dependencies" rust#42677
Link: https://github.com/rust-lang/rust/issues/42677
- commented, removed C-tracking-issue and added various A-labels to clarify what it is relevant to.
"Altivec/VSX support" rust#42743
Link: https://github.com/rust-lang/rust/issues/42743
- Left comment; seems correctly categorized, just stalled for now due to lack of developer investment.
"change how MIR inlining handles cycles" rust#43542
Link: https://github.com/rust-lang/rust/issues/43542
- Revised metadata, commented, and closed.
"Stabilise -Zsave-analysis
" rust#43606
Link: https://github.com/rust-lang/rust/issues/43606
- AFAIK, this is still used for rls. But we'd prefer to remove this eventually? -Jack
- Leaving comment that we want to remove eventually, changing labels and title
"MIR optimization tracking issue." rust#44285
Link: https://github.com/rust-lang/rust/issues/44285
- Mention in wg-mir-opt zulip stream and clsoed as not a tracking issue
processed on 2022-05-06
Link: https://github.com/rust-lang/rust/issues/44690
- Changing to T-compiler from T-dev-tools
- commented that it could use an update as to its current status
- added S-tracking-impl-incomplete
"Tracking issue: Allow autoderef and autoref in operators (experiment)" rust#44762
Link: https://github.com/rust-lang/rust/issues/44762
- appears to have some prototype work from a contributor
- marked as S-tracking-unimplemented, and asked contributor if they need help putting up a PR for their efforts
"Move more of src/rustllvm to upstream LLVM" rust#46437
Link: https://github.com/rust-lang/rust/issues/46437
- marked as S-tracking-impl-incomplete
processed on 2022-05-27
"Tracking Issue for Incremental Compilation" rust#47660
Link: https://github.com/rust-lang/rust/issues/47660
- marked as S-tracking-impl-incomplete
"codegen-units + ThinLTO is not as good as codegen-units = 1" rust#47745
Link: https://github.com/rust-lang/rust/issues/47745
"tracking issue for "chalkification"" rust#48049
Link: https://github.com/rust-lang/rust/issues/48049
- marked as S-tracking-impl-incomplete and S-tracking-needs-summary
Link: https://github.com/rust-lang/rust/issues/48547
- we should port this excellent content to the rustc-dev-guide (and then close this issue with a link to that page/chapter)
- marked as S-tracking-impl-incomplete
Link: https://github.com/rust-lang/rust/issues/48750
"Tracking issue for libtest JSON output" rust#49359
Link: https://github.com/rust-lang/rust/issues/49359
- Changed T-dev-tools to T-compiler
- We're not sure this belongs in our bucket. Kicking it over to T-libs-api instead.
"Tracking issue for generalized two-phase borrows" rust#49434
Link: https://github.com/rust-lang/rust/issues/49434
- pnkfelix left comment
- moved to T-types and adding S-tracking-design-concerns:
processed on 2022-06-03
"Expand the Rust Bookshelf 📚" rust#49453
Link: https://github.com/rust-lang/rust/issues/49453
Bounce to T-lang (maybe they decide to bounce to T-core)
"Add compiler-internal lints" rust#49509
Link: https://github.com/rust-lang/rust/issues/49509
Tagged E-help-wanted and S-tracking-impl-incomplete
"Spurious linker error with armv7-unknown-linux-gnueabihf-gcc
: relocation truncated to fit: R_ARM_THM_JUMP24 against symbol" rust#49845
Link: https://github.com/rust-lang/rust/issues/49845
Closing - old issue with no recent problems
"Diagnostics Revamp Roadmap" rust#51528
Link: https://github.com/rust-lang/rust/issues/51528
Adding S-tracking-impl-incomplete and S-tracking-needs-summary
processed on 2022-06024
"Abort instead of unwinding past FFI functions" rust#52652
Link: https://github.com/rust-lang/rust/issues/52652
Tagged WG-project-ffi-unwind and S-tracking-needs-summary
"Tracking issue for -Z emit-stack-sizes" rust#54192
Link: https://github.com/rust-lang/rust/issues/54192
Tagged S-tracking-needs-summary
"Tracking issue for RFC 2437, "Rustfmt stability"" rust#54504
Link: https://github.com/rust-lang/rust/issues/54504
Skipped: not our team
"Tracking issue for warning for rust_2018_idioms by default" rust#54910
Link: https://github.com/rust-lang/rust/issues/54910
Tagged S-tracking-impl-incomplete
"Tracking issue for trait alias
implementation (RFC 1733)" rust#55628
Link: https://github.com/rust-lang/rust/issues/55628
Tagged WG-traits and S-tracking-needs-summary
"run-pass tests: Some tests are really slow (… has been running for over 60 seconds)" rust#55841
Link: https://github.com/rust-lang/rust/issues/55841
Closed due to inactivity
"tracking issue for "universe transition"" rust#56105
Link: https://github.com/rust-lang/rust/issues/56105
Tagged WG-traits and S-tracking-impl-incomplete
"Tracking issue: –persist-doctests flag for rustdoc" rust#56925
Link: https://github.com/rust-lang/rust/issues/56925
Skipped: not our team
"NLL: complete transition from migrate to full NLL" rust#57895
Link: https://github.com/rust-lang/rust/issues/57895
Issue was already closed
"Tracking Issue for making incremental compilation the default for Release Builds" rust#57968
Link: https://github.com/rust-lang/rust/issues/57968
Tagged S-tracking-design-concerns
"NLL: turn off migration mode" rust#58781
Link: https://github.com/rust-lang/rust/issues/58781
Issue was already closed
Link: https://github.com/rust-lang/rust/issues/59302
Tagged S-tracking-impl-incomplete
"Spurious failure "failed to remove file … Access is denied" in cargo test profile_selection_check_all_targets*
on Windows" rust#56040
Link: https://github.com/rust-lang/rust/issues/56040
Closed due to inactivity
"Spurious SIGILL (signal 4) when linking with cc
on macOS during doctest" rust#58209
Link: https://github.com/rust-lang/rust/issues/58209
Closed due to inactivity
Processed on 2022-08-12
"eventual goal: re-remove leak-check from compiler " rust#59490
Link: https://github.com/rust-lang/rust/issues/59490
- there was an update here 28 days ago from T-types:
discussed in the t-types backlog bonanza
While the plan for how we want to remove the leak check has changed, we still intend to remove the current version, so we're keeping this open to track that for now.
The goal is to pretty much add a param_env
aware leak check directly into trait solving and remove the current impl.
- added S-tracking-unimplemented
"Tracking issue for RFC 2603, "Rust Symbol Mangling (v0)"" rust#60705
Link: https://github.com/rust-lang/rust/issues/60705
Left comment: https://github.com/rust-lang/rust/issues/60705#issuecomment-1213168334
- Added S-tracking-needs-to-bake
"Add missing long error code explanations" rust#61137
Link: https://github.com/rust-lang/rust/issues/61137
- Removed C-tracking-issue and added metabug label.
"Tracking issue for -Z binary-dep-depinfo" rust#63012
Link: https://github.com/rust-lang/rust/issues/63012
"Decide whether to suggest anything when encountering break
and expecting !
" rust#63390
Link: https://github.com/rust-lang/rust/issues/63390
"Tracking issue for dual-proc-macros" rust#64671
Link: https://github.com/rust-lang/rust/issues/64671
Processed on 2022-09-09
"create a lint for tracking "tainted" fallback around abrupt expressions and !
type" rust#66173
- left comment, tagged as S-tracking-design-concerns, and closed
Link: https://github.com/rust-lang/rust/issues/66173
Link: https://github.com/rust-lang/rust/issues/67799
- left comment but otherwise skipped as a T-rustdoc specific item
"Tracking Issue for Generator Memory Usage" rust#69826
Link: https://github.com/rust-lang/rust/issues/69826
- not really a tracking issue in the sense of C-tracking-issue
- left comment, added metabug and removed C-tracking-issue
"Tracking Issue for -Z src-hash-algorithm
" rust#70401
Link: https://github.com/rust-lang/rust/issues/70401
- open question about whether this should be command line flag, or part of the target specification.
- left comment, tagged as S-tracking-needs-summary
"Cargotest enhancements" rust#70659
Link: https://github.com/rust-lang/rust/issues/70659
"Tracking issue for generator code quality" rust#71407
Link: https://github.com/rust-lang/rust/issues/71407
- not really a tracking issue in the sense of C-tracking-issue
- left comment, added metabug and removed C-tracking-issue
"Tracking Issue for making ptr offset methods "const fn"" rust#71499
Link: https://github.com/rust-lang/rust/issues/71499
- already closed as complete
"Use lld by default on x64 Ubuntu 20.04 LTS" rust#71515
Link: https://github.com/rust-lang/rust/issues/71515
- lqd's work on compiler-team#510 is meant to address this
- left comment and tagged as S-tracking-impl-incomplete
"Use lld by default on x64 msvc windows" rust#71520
Link: https://github.com/rust-lang/rust/issues/71520
- left comment, tagged as S-tracking-needs-summary
"Tracking issue for Lazy Normalization of Constants" rust#72219
Link: https://github.com/rust-lang/rust/issues/72219
- already closed by lcnr as "having no purpose"
- skipping in meeting
"Tracking issue for supporting macOS on Apple Silicon (a.k.a arm64, M1, aarch64)" rust#73908
Link: https://github.com/rust-lang/rust/issues/73908
- left comment, marked S-tracking-impl-incomplete
Processed on 2022-09-16
"Tracking Issue for tracked access to environment variables from proc macros" rust#74690
Link: https://github.com/rust-lang/rust/issues/74690
- This was closed back on 2022-07-20 in favor of #99515
"Tracking issue for new LLVM pass manager (-Znew-llvm-pass-manager)" rust#74705
Link: https://github.com/rust-lang/rust/issues/74705
"Tracking Issue for assert_eq
in constants" rust#74925
Link: https://github.com/rust-lang/rust/issues/74925
- should either close or removing
C-tracking-issue
label
"Tracking Issue for the use of ?
in constants" rust#74935
- should either close or removing
C-tracking-issue
label
Link: https://github.com/rust-lang/rust/issues/74935
"Tracking issue for const <*const T>::is_null
" rust#74939
Link: https://github.com/rust-lang/rust/issues/74939
Processed on 2022-09-23
"Tracking Issue for const MaybeUninit::as(_mut)_ptr (feature: const_maybe_uninit_as_ptr)" rust#75251
Link: https://github.com/rust-lang/rust/issues/75251
- left comment, added label: +T-libs +S-tracking-needs-summary
"Tracking Issue for improved item code blocks" rust#75303
Link: https://github.com/rust-lang/rust/issues/75303
"Tracking Issue for pointer methods returning MaybeUninit<T>
" rust#75402
Link: https://github.com/rust-lang/rust/issues/75402
- S-tracking-design-concerns
Processed on 2022-10-14
Link: https://github.com/rust-lang/rust/issues/75890
"Tracking issue for const Ordering
methods" rust#76113
Link: https://github.com/rust-lang/rust/issues/76113
- left comment, added T-libs-api and S-tracking-need-summary
"Tracking Issue for const_caller_location" rust#76156
Link: https://github.com/rust-lang/rust/issues/76156
- Not clear whether this is useful to stabilize without also stably providing Location accessors in stable.
- left comment, tagged with S-tracking-needs-to-bake
"Tracking issue for MIR-level integer range analysis" rust#76579
Link: https://github.com/rust-lang/rust/issues/76579
- not a real tracking issue in sense intended by C-tracking-issue. added comment and removed label.
"Support stack probing for arm64 (aarch64)" rust#77071
Link: https://github.com/rust-lang/rust/issues/77071
- left comment, tagged as unimplemented