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Draft release notes for 1.91
#147010 ·
Mark-Simulacrum
opened
on Sep 25, 2025
19
Issues
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state
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label
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A-cranelift
state:open label:A-cranelift
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Open
Closed
ICE: rustc_query_system: dep_graph: assertion failed (dep node index out of range)
-Zshare-generics
Unstable options: Share generic instantiations.
Unstable options: Share generic instantiations.
A-cranelift
Things relevant to the [future] cranelift backend
Things relevant to the [future] cranelift backend
A-incr-comp
Area: Incremental compilation
Area: Incremental compilation
A-query-system
Area: The rustc query system (https://rustc-dev-guide.rust-lang.org/query.html)
Area: The rustc query system (https://rustc-dev-guide.rust-lang.org/query.html)
C-bug
Category: This is a bug.
Category: This is a bug.
I-ICE
Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️
Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️
requires-nightly
This issue requires a nightly compiler in some way.
This issue requires a nightly compiler in some way.
S-needs-repro
Status: This issue has no reproduction and needs a reproduction to make progress.
Status: This issue has no reproduction and needs a reproduction to make progress.
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
Relevant to the compiler team, which will review and decide on the PR/issue.
Status: Open.
#142778
In rust-lang/rust;
·
olekspickle
opened
on Jun 20, 2025
Call stack exhaustion (overflow) in parser with a very large generated file
A-cranelift
Things relevant to the [future] cranelift backend
Things relevant to the [future] cranelift backend
A-parser
Area: The lexing & parsing of Rust source code to an AST
Area: The lexing & parsing of Rust source code to an AST
C-bug
Category: This is a bug.
Category: This is a bug.
I-ICE
Issue: The compiler panicked, giving an Internal Compilation Error (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.
Relevant to the compiler team, which will review and decide on the PR/issue.
Status: Open.
#128422
In rust-lang/rust;
·
sunshowers
opened
on Jul 31, 2024
Cleanup: Share DST size/align computation logic between codegen backends (and interpreter)
A-codegen
Area: Code generation
Area: Code generation
A-const-eval
Area: Constant evaluation, covers all const contexts (static, const fn, ...)
Area: Constant evaluation, covers all const contexts (static, const fn, ...)
A-cranelift
Things relevant to the [future] cranelift backend
Things relevant to the [future] cranelift backend
C-cleanup
Category: PRs that clean code up or issues documenting cleanup.
Category: PRs that clean code up or issues documenting cleanup.
Status: Open.
#103728
In rust-lang/rust;
·
RalfJung
opened
on Oct 29, 2022
Inconsistency in behavior of MIR and SIMD shifts
A-cranelift
Things relevant to the [future] cranelift backend
Things relevant to the [future] cranelift backend
A-LLVM
Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues.
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
Area: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html
A-SIMD
Area: SIMD (Single Instruction Multiple Data)
Area: SIMD (Single Instruction Multiple Data)
C-discussion
Category: Discussion or questions that doesn't represent real issues.
Category: Discussion or questions that doesn't represent real issues.
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
Relevant to the compiler team, which will review and decide on the PR/issue.
Status: Open.
#91237
In rust-lang/rust;
·
RalfJung
opened
on Nov 25, 2021
Index argument for simd_insert no longer a const
A-cranelift
Things relevant to the [future] cranelift backend
Things relevant to the [future] cranelift backend
A-SIMD
Area: SIMD (Single Instruction Multiple Data)
Area: SIMD (Single Instruction Multiple Data)
C-bug
Category: This is a bug.
Category: This is a bug.
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
Relevant to the compiler team, which will review and decide on the PR/issue.
Status: Open.
#85105
In rust-lang/rust;
·
bjorn3
opened
on May 9, 2021
Add in memory object files support to CompiledModule and ArchiveBuilder
A-codegen
Area: Code generation
Area: Code generation
A-cranelift
Things relevant to the [future] cranelift backend
Things relevant to the [future] cranelift backend
C-enhancement
Category: An issue proposing an enhancement or a PR with one.
Category: An issue proposing an enhancement or a PR with one.
I-compiletime
Issue: Problems and improvements with respect to compile times.
Issue: Problems and improvements with respect to compile times.
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
Relevant to the compiler team, which will review and decide on the PR/issue.
Status: Open.
#69946
In rust-lang/rust;
·
bjorn3
opened
on Mar 12, 2020
Let custom codegen backends opt out of LTO
A-codegen
Area: Code generation
Area: Code generation
A-cranelift
Things relevant to the [future] cranelift backend
Things relevant to the [future] cranelift backend
A-linkage
Area: linking into static, shared libraries and binaries
Area: linking into static, shared libraries and binaries
C-feature-request
Category: A feature request, i.e: not implemented / a PR.
Category: A feature request, i.e: not implemented / a PR.
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
Relevant to the compiler team, which will review and decide on the PR/issue.
Status: Open.
#68349
In rust-lang/rust;
·
bjorn3
opened
on Jan 18, 2020
[cg_ssa] TerminatorCodegenHelper::do_call assumes that destination doesnt have more than one predecessor
A-codegen
Area: Code generation
Area: Code generation
A-cranelift
Things relevant to the [future] cranelift backend
Things relevant to the [future] cranelift backend
C-bug
Category: This is a bug.
Category: This is a bug.
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
Relevant to the compiler team, which will review and decide on the PR/issue.
Status: Open.
#67161
In rust-lang/rust;
·
bjorn3
opened
on Dec 8, 2019
[rustc_codegen_ssa] Let function calls and definitions use OperandValue or custom enum instead of Bx::Value
A-codegen
Area: Code generation
Area: Code generation
A-cranelift
Things relevant to the [future] cranelift backend
Things relevant to the [future] cranelift backend
C-enhancement
Category: An issue proposing an enhancement or a PR with one.
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.
Relevant to the compiler team, which will review and decide on the PR/issue.
Status: Open.
#67097
In rust-lang/rust;
·
bjorn3
opened
on Dec 6, 2019
Refactorings for rustc_codegen_ssa
A-codegen
Area: Code generation
Area: Code generation
A-cranelift
Things relevant to the [future] cranelift backend
Things relevant to the [future] cranelift backend
A-gcc
Things relevant to the [future] GCC backend
Things relevant to the [future] GCC backend
C-cleanup
Category: PRs that clean code up or issues documenting cleanup.
Category: PRs that clean code up or issues documenting cleanup.
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
Relevant to the compiler team, which will review and decide on the PR/issue.
Status: Open.
#56108
In rust-lang/rust;
·
bjorn3
opened
on Nov 20, 2018
Consider using pair mode to return scalar pair bools as i1
A-codegen
Area: Code generation
Area: Code generation
A-cranelift
Things relevant to the [future] cranelift backend
Things relevant to the [future] cranelift backend
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
Relevant to the compiler team, which will review and decide on the PR/issue.
Status: Open.
#52198
In rust-lang/rust;
·
cuviper
opened
on Jul 10, 2018
Refactor librustc_codegen_llvm for multiple codegen backends.
A-codegen
Area: Code generation
Area: Code generation
A-cranelift
Things relevant to the [future] cranelift backend
Things relevant to the [future] cranelift backend
A-gcc
Things relevant to the [future] GCC backend
Things relevant to the [future] GCC backend
C-feature-request
Category: A feature request, i.e: not implemented / a PR.
Category: A feature request, i.e: not implemented / a PR.
T-compiler
Relevant to the compiler team, which will review and decide on the PR/issue.
Relevant to the compiler team, which will review and decide on the PR/issue.
Status: Open.
#45274
In rust-lang/rust;
·
eddyb
opened
on Oct 14, 2017
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