aeubanks wrote:
ah there's a stack trace in an asserts build of clang
```
F0000 00:00:1728077756.977871 3296 logging.cc:62] assert.h assertion failed at third_party/llvm/llvm-project/clang/lib/Sema/SemaTemplateInstantiate.cpp:4602 in llvm::PointerUnion<Decl *, LocalInstantiationScope::DeclArgumentPack *> *clang::LocalInstantiationScope::findInstantiationOf(const Decl *): isa<
LabelDecl>(D) && "declaration not instantiated in this scope"
@ 0x563ef889e824 __assert_fail
@ 0x563ef47a3bf4 clang::LocalInstantiationScope::findInstantiationOf()
@ 0x563ef4836942 clang::Sema::FindInstantiatedDecl()
@ 0x563ef4810491 clang::TreeTransform<>::TransformLambdaExpr()
@ 0x563ef47ffb91 (anonymous namespace)::TemplateInstantiator::TransformLambdaExpr()
@ 0x563ef47a1dc2 clang::TreeTransform<>::TransformExprs()
@ 0x563ef480293d clang::TreeTransform<>::TransformCallExpr()
@ 0x563ef479f7fa clang::TreeTransform<>::TransformStmt()
@ 0x563ef4809f34 clang::TreeTransform<>::TransformCompoundStmt()
@ 0x563ef479f788 clang::Sema::SubstStmt()
@ 0x563ef484a01d clang::Sema::InstantiateFunctionDefinition()
@ 0x563ef484d0bf clang::Sema::PerformPendingInstantiations()
@ 0x563ef484a108 clang::Sema::InstantiateFunctionDefinition()
@ 0x563ef484d0bf clang::Sema::PerformPendingInstantiations()
@ 0x563ef484a108 clang::Sema::InstantiateFunctionDefinition()
@ 0x563ef484d0bf clang::Sema::PerformPendingInstantiations()
@ 0x563ef484a108 clang::Sema::InstantiateFunctionDefinition()
@ 0x563ef484d0bf clang::Sema::PerformPendingInstantiations()
@ 0x563ef3dbb8fb clang::Sema::ActOnEndOfTranslationUnitFragment()
@ 0x563ef3dbc021 clang::Sema::ActOnEndOfTranslationUnit()
@ 0x563ef3ae663a clang::Parser::ParseTopLevelDecl()
```
still trying to reduce the reproducer...
https://github.com/llvm/llvm-project/pull/109167