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Draft release notes for 1.87
#140133 opened Apr 21, 2025 by BoxyUwU
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Issues list

DWARF does not emit DW_TAG_label A-debuginfo Area: Debugging information in compiled programs (DWARF, PDB, etc.) A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-enhancement Category: An issue proposing an enhancement or a PR with one. needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#140407 opened Apr 28, 2025 by ratmice
1
Should comments about deaggregation be deleted ? A-docs Area: Documentation for any part of the project, including the compiler, standard library, and tools A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#139323 opened Apr 3, 2025 by y1lan
Promoted constants lead to poor MIR from comparisons A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html A-mir-opt Area: MIR optimizations needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. WG-mir-opt Working group: MIR optimizations
#139093 opened Mar 29, 2025 by scottmcm
FakeReads create inconsistent results with equivalent examples involving partial moves A-docs Area: Documentation for any part of the project, including the compiler, standard library, and tools A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#137677 opened Feb 26, 2025 by meithecatte
MIR debuginfo: Capture by value contains additional dereference with --edition 2021 A-debuginfo Area: Debugging information in compiled programs (DWARF, PDB, etc.) A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#136486 opened Feb 3, 2025 by prusovak2
Rust compiler hangs when pretty-printing MIR for a constant A-const-eval Area: Constant evaluation, covers all const contexts (static, const fn, ...) A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-bug Category: This is a bug. I-hang Issue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#132122 opened Oct 25, 2024 by celinval
3
Box sometimes forgets to drop its allocator when the Box is conditionally initialized. A-allocators Area: Custom and system allocators A-box Area: Our favorite opsem complication A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#131082 opened Oct 1, 2024 by theemathas
1
@beepster4096
2
tests/debuginfo/macro-stepping.rs remains broken with SingleUseConsts A-debuginfo Area: Debugging information in compiled programs (DWARF, PDB, etc.) A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html A-testsuite Area: The testsuite used to check the correctness of rustc C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. WG-debugging Working group: Bad Rust debugging experiences WG-llvm Working group: LLVM backend code generation
#130896 opened Sep 26, 2024 by khuey
MIR building generates mistyped assignments for opaques in dead code A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-bug Category: This is a bug. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#129084 opened Aug 14, 2024 by lcnr
Unexpected unsizing coercion introduced by unsafe block A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html T-opsem Relevant to the opsem team T-types Relevant to the types team, which will review and decide on the PR/issue.
#128880 opened Aug 9, 2024 by RalfJung
3
MIR_borrow_checking and MIR_effect_checking are very slow A-borrow-checker Area: The borrow checker A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-bug Category: This is a bug. E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#126440 opened Jun 13, 2024 by programmerjake
4
ICE: called Option::unwrap() on a None value in rustc_middle/src/mir/tcx.rs A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-bug Category: This is a bug. F-generic_const_exprs `#![feature(generic_const_exprs)]` I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ requires-incomplete-features This issue requires the use of incomplete features. S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#125801 opened May 31, 2024 by cushionbadak
2
Change SwitchTarget (in TerminatorKind::SwitchInt) to use ScalarInt A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-enhancement Category: An issue proposing an enhancement or a PR with one. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#124127 opened Apr 18, 2024 by RalfJung
ICE: broken mir with temporary lifetime extention A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#123810 opened Apr 11, 2024 by matthiaskrgr
@dingxiangfei2009
2
ICE: Unsigned value 0x100 does not fit in 8 bits A-layout Area: Memory layout of types A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-bug Category: This is a bug. E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#123690 opened Apr 9, 2024 by matthiaskrgr
4
Try to hoist the conversion of diverging calls to aborts to a layer above MIR lowering A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html E-help-wanted Call for participation: Help is requested to fix this issue. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#122956 opened Mar 23, 2024 by saethlin
12
ICE: b.index() < self.live_nodes A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#121623 opened Feb 26, 2024 by matthiaskrgr
1
4
ICE: called 'Result::unwrap()' on an 'Err' value: Unknown(Aligned) A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#121097 opened Feb 14, 2024 by matthiaskrgr
3
ICE: Broken MIR: NoSolution A-GATs Area: Generic associated types (GATs) A-lifetimes Area: Lifetimes / regions A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ S-bug-has-test Status: This bug is tracked inside the repo by a `known-bug` test. S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#120811 opened Feb 8, 2024 by antiguru
6
Custom MIR: ICE on assigning to reference in enum variant A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#119940 opened Jan 13, 2024 by cbeuw
2
ICE: Failed to extract DefId: def_kind e8...bc A-incr-comp Area: Incremental compilation A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#119132 opened Dec 19, 2023 by 0xTiger
@cjgillot
7
Closure field capturing leads to inconsistent MIR printing A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html
#115307 opened Aug 28, 2023 by RalfJung
2
Can MIR have irreducible control flow? A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html
#114047 opened Jul 25, 2023 by RalfJung
12
Custom MIR: bad span for assignments A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#113549 opened Jul 10, 2023 by RalfJung
1
Removing DropAndReplace MIR allowed more code to compile A-MIR Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html T-lang Relevant to the language team, which will review and decide on the PR/issue.
#113501 opened Jul 9, 2023 by cjgillot
2 tasks
1.70.0
@cjgillot
1
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