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Macro Expansion Hangs/OOMs

A-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

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

I-compilememIssue: Problems and improvements with respect to memory usage during compilation.Issue: Problems and improvements with respect to memory usage during compilation.

I-hangIssue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc.Issue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc.

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.

#146767 In rust-lang/rust;

· levinwinter opened on Sep 19, 2025

rust newer than 1.82.0 unable to build firefox on NetBSD "i386" port (really i586 or i686 in 32-bit mode)

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

I-compilememIssue: Problems and improvements with respect to memory usage during compilation.Issue: Problems and improvements with respect to memory usage during compilation.

O-x86_32Target: x86 processors, 32 bit (like i686-*) (also known as IA-32, i386, i586, i686)Target: x86 processors, 32 bit (like i686-*) (also known as IA-32, i386, i586, i686)

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

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.

#143904 In rust-lang/rust;

· he32 opened on Jul 13, 2025

Compile-time resource exhaustion from type complexity via recursive generic traits

A-trait-systemArea: Trait systemArea: Trait system

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

E-needs-mcveCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable ExampleCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example

I-compilememIssue: Problems and improvements with respect to memory usage during compilation.Issue: Problems and improvements with respect to memory usage during compilation.

I-hangIssue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc.Issue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc.

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.

#142840 In rust-lang/rust;

· caomingpei opened on Jun 21, 2025

stack overflow while compiling async recursion

A-async-awaitArea: Async & AwaitArea: Async & Await

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

I-compilememIssue: Problems and improvements with respect to memory usage during compilation.Issue: Problems and improvements with respect to memory usage during compilation.

I-crashIssue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.

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.

#140725 In rust-lang/rust;

· ehaydenr opened on May 6, 2025

transmutability: high memory unsage for types containing references

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

F-transmutability`#![feature(transmutability)]``#![feature(transmutability)]`

I-compilememIssue: Problems and improvements with respect to memory usage during compilation.Issue: Problems and improvements with respect to memory usage during compilation.

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.

#140610 In rust-lang/rust;

· tmiasko opened on May 3, 2025

ICE: <code>unable to allocate fiber: The paging file is too small for this operation to complete. (os error 1455)</code>

A-incr-compArea: Incremental compilationArea: Incremental compilation

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

E-needs-mcveCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable ExampleCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example

I-compilememIssue: Problems and improvements with respect to memory usage during compilation.Issue: Problems and improvements with respect to memory usage during compilation.

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.

#137536 In rust-lang/rust;

· ABouttefeux opened on Feb 24, 2025

Trait implementation causes <code>Object File Too Large</code> error and compilation crash

A-trait-systemArea: Trait systemArea: Trait system

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

I-compilememIssue: Problems and improvements with respect to memory usage during compilation.Issue: Problems and improvements with respect to memory usage during compilation.

I-compiletimeIssue: Problems and improvements with respect to compile times.Issue: Problems and improvements with respect to compile times.

I-crashIssue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.

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-trait-system-refactorThe Rustc Trait System Refactor Initiative (-Znext-solver)The Rustc Trait System Refactor Initiative (-Znext-solver)

Status: Open.

#135849 In rust-lang/rust;

· benwis opened on Jan 21, 2025

Large files containing many tokens of <code>const</code> data compile very slowly and use a lot of memory (in MIR_borrow_checking and expand_crate)

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

I-compilememIssue: Problems and improvements with respect to memory usage during compilation.Issue: Problems and improvements with respect to memory usage during compilation.

I-slowIssue: Problems and improvements with respect to performance of generated code.Issue: Problems and improvements with respect to performance of generated code.

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.

#134404 In rust-lang/rust;

· Manishearth opened on Dec 17, 2024

Hang on TAIT with diverging projection in its ParamEnv

A-trait-systemArea: Trait systemArea: Trait system

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

F-type_alias_impl_trait`#[feature(type_alias_impl_trait)]``#[feature(type_alias_impl_trait)]`

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

I-compilememIssue: Problems and improvements with respect to memory usage during compilation.Issue: Problems and improvements with respect to memory usage during compilation.

I-hangIssue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc.Issue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc.

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.

#132797 In rust-lang/rust;

· ym-xie opened on Nov 9, 2024

High memory usage with cargo build in match statement

A-patternsRelating to patterns and pattern matchingRelating to patterns and pattern matching

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

I-compilememIssue: Problems and improvements with respect to memory usage during compilation.Issue: Problems and improvements with respect to memory usage during compilation.

I-crashIssue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.

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.

#131410 In rust-lang/rust;

· Joshix-1 opened on Oct 8, 2024

rustc consumes &gt; 50GB memory, completes eventually but def. stuck on something

A-type-systemArea: Type systemArea: Type system

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

E-needs-mcveCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable ExampleCall for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example

I-compilememIssue: Problems and improvements with respect to memory usage during compilation.Issue: Problems and improvements with respect to memory usage during compilation.

I-compiletimeIssue: Problems and improvements with respect to compile times.Issue: Problems and improvements with respect to compile times.

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.

#129844 In rust-lang/rust;

· GlenDC opened on Sep 1, 2024

Compiler hangs and consumes unbounded memory with complex trait bounds

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-compilememIssue: Problems and improvements with respect to memory usage during compilation.Issue: Problems and improvements with respect to memory usage during compilation.

I-hangIssue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc.Issue: The compiler never terminates, due to infinite loops, deadlock, livelock, etc.

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.

#126952 In rust-lang/rust;

· i1i1 opened on Jun 25, 2024