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ICE if returned lambda unpacks captured parameter pack in requires clause

clang:frontendLanguage frontend issues, e.g. anything involving "Sema"Language frontend issues, e.g. anything involving "Sema"

conceptsC++20 conceptsC++20 concepts

crash-on-valid

lambdaC++11 lambda expressionsC++11 lambda expressions

regression:18Regression in 18 releaseRegression in 18 release

Status: Open.

Bug

#169968 In llvm/llvm-project;

· FalcoGer opened on Nov 29, 2025

return-type deduction failure for lambda inside decltype.

clang:frontendLanguage frontend issues, e.g. anything involving "Sema"Language frontend issues, e.g. anything involving "Sema"

diverges-from:gccDoes the clang frontend diverge from gcc on this issueDoes the clang frontend diverge from gcc on this issue

lambdaC++11 lambda expressionsC++11 lambda expressions

Status: Open.

#168249 In llvm/llvm-project;

· jehelset opened on Nov 15, 2025

Lambda evaluated for constant template parameter of function inside templated generic lambda incorrectly complains about local variables needing captures

clang:frontendLanguage frontend issues, e.g. anything involving "Sema"Language frontend issues, e.g. anything involving "Sema"

confirmedVerified by a second partyVerified by a second party

lambdaC++11 lambda expressionsC++11 lambda expressions

Status: Open.

Bug

#163837 In llvm/llvm-project;

· MitalAshok opened on Oct 16, 2025

Type of capture is broken in body of lambda with explicit object parameter

accepts-invalid

clang:frontendLanguage frontend issues, e.g. anything involving "Sema"Language frontend issues, e.g. anything involving "Sema"

confirmedVerified by a second partyVerified by a second party

lambdaC++11 lambda expressionsC++11 lambda expressions

Status: Open.

#163582 In llvm/llvm-project;

· xiaosa-zhz opened on Oct 15, 2025

[Clang] [Sema] Crash when <code>this</code> is used in the return type (or <code>noexcept</code> clause) of a lambda in a static member function

clang:frontendLanguage frontend issues, e.g. anything involving "Sema"Language frontend issues, e.g. anything involving "Sema"

crash-on-invalid

lambdaC++11 lambda expressionsC++11 lambda expressions

regression:18Regression in 18 releaseRegression in 18 release

Status: Open.

Bug

#163089 In llvm/llvm-project;

· Sirraide opened on Oct 12, 2025

[clang] concepts/require crash clang

clang:frontendLanguage frontend issues, e.g. anything involving "Sema"Language frontend issues, e.g. anything involving "Sema"

conceptsC++20 conceptsC++20 concepts

crash-on-valid

lambdaC++11 lambda expressionsC++11 lambda expressions

regression:17Regression in 17 releaseRegression in 17 release

Status: Open.

Bug

#161348 In llvm/llvm-project;

· kikaxa opened on Sep 30, 2025

[Clang] Crash on pack expansion with lambda capture

clang:frontendLanguage frontend issues, e.g. anything involving "Sema"Language frontend issues, e.g. anything involving "Sema"

confirmedVerified by a second partyVerified by a second party

crashPrefer [crash-on-valid] or [crash-on-invalid]Prefer [crash-on-valid] or [crash-on-invalid]

lambdaC++11 lambda expressionsC++11 lambda expressions

Status: Open.

Bug

#161002 In llvm/llvm-project;

· MagentaTreehouse opened on Sep 27, 2025

[clang] Valid constexpr noexcept expression with explicit lambda return type is rejected

clang:frontendLanguage frontend issues, e.g. anything involving "Sema"Language frontend issues, e.g. anything involving "Sema"

constexprAnything related to constant evaluationAnything related to constant evaluation

lambdaC++11 lambda expressionsC++11 lambda expressions

Status: Open.

#157103 In llvm/llvm-project;

· TheAliceBaskerville opened on Sep 5, 2025

[Clang] Global closure types are never handled by <code>ASTConsumer</code>

clang:frontendLanguage frontend issues, e.g. anything involving "Sema"Language frontend issues, e.g. anything involving "Sema"

lambdaC++11 lambda expressionsC++11 lambda expressions

Status: Open.

#157101 In llvm/llvm-project;

· zwuis opened on Sep 5, 2025

Clang argument deduction failure within nested generic lambda

clang:frontendLanguage frontend issues, e.g. anything involving "Sema"Language frontend issues, e.g. anything involving "Sema"

lambdaC++11 lambda expressionsC++11 lambda expressions

regression:15Regression in 15 releaseRegression in 15 release

Status: Open.

Bug

#154065 In llvm/llvm-project;

· sneed-deens opened on Aug 18, 2025

[clang] Crash in lambda return type involving decltype of bound argument

clang:codegenIR generation bugs: mangling, exceptions, etc.IR generation bugs: mangling, exceptions, etc.

crashPrefer [crash-on-valid] or [crash-on-invalid]Prefer [crash-on-valid] or [crash-on-invalid]

lambdaC++11 lambda expressionsC++11 lambda expressions

regression:19Regression in 19 releaseRegression in 19 release

Status: Open.

Bug

#153493 In llvm/llvm-project;

· MR2K5 opened on Aug 13, 2025

[Clang] Crash (SIGSEGV) in template argument deduction involving nested generic lambdas and local classes

clang:frontendLanguage frontend issues, e.g. anything involving "Sema"Language frontend issues, e.g. anything involving "Sema"

confirmedVerified by a second partyVerified by a second party

crash-on-invalid

generated by fuzzer

lambdaC++11 lambda expressionsC++11 lambda expressions

regression:13Regression in 13 releaseRegression in 13 release

Status: Open.

Bug

#152689 In llvm/llvm-project;

· Xniao opened on Aug 8, 2025