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
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