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Figure out all debugging information representations of statements

A-debuginfoArea: Debugging information in compiled programs (DWARF, PDB, etc.)Area: Debugging information in compiled programs (DWARF, PDB, etc.)

A-mir-optArea: MIR optimizationsArea: MIR optimizations

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

Status: Open.

#147679 In rust-lang/rust;

· dianqk opened on Oct 14, 2025

Cycle detected when optimizing MIR

A-mir-optArea: MIR optimizationsArea: MIR optimizations

C-bugCategory: This is a bug.Category: This is a bug.

I-cycleIssue: A query cycle occurred while none was expectedIssue: A query cycle occurred while none was expected

P-mediumMedium priorityMedium priority

regression-from-stable-to-stablePerformance or correctness regression from one stable version to another.Performance or correctness regression from one stable version to another.

S-has-bisectionStatus: A bisection has been found for this issueStatus: A bisection has been found for this issue

S-has-mcveStatus: A Minimal Complete and Verifiable Example has been found for this issueStatus: A Minimal Complete and Verifiable Example has been found for this issue

T-compilerRelevant 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.

#146998 In rust-lang/rust;

· FlixCoder opened on Sep 24, 2025

SignatureMismatch ICE

A-associated-itemsArea: Associated items (types, constants & functions)Area: Associated items (types, constants & functions)

A-mir-optArea: MIR optimizationsArea: MIR optimizations

A-mir-opt-inliningArea: MIR inliningArea: MIR inlining

A-trait-systemArea: Trait systemArea: Trait system

C-bugCategory: This is a bug.Category: This is a bug.

fixed-by-next-solverFixed by the next-generation trait solver, `-Znext-solver`.Fixed by the next-generation trait solver, `-Znext-solver`.

I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

P-highHigh priorityHigh priority

regression-from-stable-to-stablePerformance or correctness regression from one stable version to another.Performance or correctness regression from one stable version to another.

S-has-mcveStatus: A Minimal Complete and Verifiable Example has been found for this issueStatus: A Minimal Complete and Verifiable Example has been found for this issue

T-compilerRelevant 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.

T-typesRelevant to the types team, which will review and decide on the PR/issue.Relevant to the types team, which will review and decide on the PR/issue.

Status: Open.

#146965 In rust-lang/rust;

· benruijl opened on Sep 24, 2025

Aliasing-related miscompile in CopyProp (use after Move of place)

A-mir-optArea: MIR optimizationsArea: MIR optimizations

A-rustlantisA miscompilation found by RustlantisA miscompilation found by Rustlantis

C-bugCategory: This is a bug.Category: This is a bug.

I-miscompileIssue: Correct Rust code lowers to incorrect machine codeIssue: Correct Rust code lowers to incorrect machine code

P-highHigh priorityHigh priority

S-has-mcveStatus: A Minimal Complete and Verifiable Example has been found for this issueStatus: A Minimal Complete and Verifiable Example has been found for this issue

T-compilerRelevant 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.

#146423 In rust-lang/rust;

· saethlin opened on Sep 10, 2025

Missed optimization: multiple instances of a small struct don't reuse the stack allocation

A-codegenArea: Code generationArea: Code generation

A-MIRArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.htmlArea: Mid-level IR (MIR) - https://blog.rust-lang.org/2016/04/19/MIR.html

A-mir-optArea: MIR optimizationsArea: MIR optimizations

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

T-compilerRelevant 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.

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#141649 In rust-lang/rust;

· ohadravid opened on May 27, 2025

ICE: mir opts crash rustc with -Zmir-preserve-ub in compiler/rustc_mir_transform/src/simplify_comparison_integral.rs

A-mir-optArea: MIR optimizationsArea: MIR optimizations

C-bugCategory: This is a bug.Category: This is a bug.

I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

T-compilerRelevant 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.

#141454 In rust-lang/rust;

· matthiaskrgr opened on May 23, 2025

GVN misunderstands aliasing, can create overlapping assignments (again)

A-mir-optArea: MIR optimizationsArea: MIR optimizations

A-mir-opt-GVNArea: MIR opt Global Value Numbering (GVN)Area: MIR opt Global Value Numbering (GVN)

A-rustlantisA miscompilation found by RustlantisA miscompilation found by Rustlantis

C-bugCategory: This is a bug.Category: This is a bug.

I-miscompileIssue: Correct Rust code lowers to incorrect machine codeIssue: Correct Rust code lowers to incorrect machine code

I-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness

P-highHigh priorityHigh priority

T-compilerRelevant 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.

#141313 In rust-lang/rust;

· saethlin opened on May 20, 2025

Ensure we can optimize out does-nothing <code>drop</code>s like <code>array::IntoIter&lt;NotNeedsDrop, N&gt;</code>

A-mir-optArea: MIR optimizationsArea: MIR optimizations

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

T-compilerRelevant 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.

#139422 In rust-lang/rust;

· scottmcm opened on Apr 5, 2025

Simple <code>Option</code> use, like in <code>checked_sub</code>, should optimize out fully in MIR

A-mir-optArea: MIR optimizationsArea: MIR optimizations

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

T-compilerRelevant 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.

Enhancement

#138544 In rust-lang/rust;

· scottmcm opened on Mar 15, 2025

ICE：called <code>Result::unwrap()</code> on an <code>Err</code> value: ReferencesError(ErrorGuaranteed(()))

A-mir-optArea: MIR optimizationsArea: MIR optimizations

C-bugCategory: This is a bug.Category: This is a bug.

E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.

I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

T-compilerRelevant 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.

#138225 In rust-lang/rust;

· sososopy opened on Mar 8, 2025

CopyProp miscompilation when src is moved more than once

A-mir-optArea: MIR optimizationsArea: MIR optimizations

C-bugCategory: This is a bug.Category: This is a bug.

I-miscompileIssue: Correct Rust code lowers to incorrect machine codeIssue: Correct Rust code lowers to incorrect machine code

I-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness

requires-nightlyThis issue requires a nightly compiler in some way.This issue requires a nightly compiler in some way.

T-compilerRelevant 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.

T-opsemRelevant to the opsem teamRelevant to the opsem team

Status: Open.

#137936 In rust-lang/rust;

· tmiasko opened on Mar 3, 2025

MIR passes do not take into account if an operation is convergent

A-mir-optArea: MIR optimizationsArea: MIR optimizations

C-bugCategory: This is a bug.Category: This is a bug.

I-miscompileIssue: Correct Rust code lowers to incorrect machine codeIssue: Correct Rust code lowers to incorrect machine code

I-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness

O-amdgcnTarget: the Radeon 9001XT and suchTarget: the Radeon 9001XT and such

O-NVPTXTarget: the NVPTX LLVM backend for running rust on GPUs, https://llvm.org/docs/NVPTXUsage.htmlTarget: the NVPTX LLVM backend for running rust on GPUs, https://llvm.org/docs/NVPTXUsage.html

T-compilerRelevant 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.

WG-mir-optWorking group: MIR optimizationsWorking group: MIR optimizations

Status: Open.

#137086 In rust-lang/rust;

· kulst opened on Feb 15, 2025