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We previously doubled the id-expression expansion, even when the pack was expanded to empty. The previous condition for determining whether we should expand couldn't distinguish between cases where 'the expansion was previously postponed' and 'the expansion occurred but resulted in emptiness.' In the latter scenario, we crash because we have not been examining the current lambda's parent local instantiation scope since [D98068](https://reviews.llvm.org/D98068): Any Decls instantiated in the parent scope are not visible to the generic lambda, and thus any attempt of looking for instantiated Decls in the lambda is capped to the current Lambda's LIS. Fixes https://github.com/llvm/llvm-project/issues/92230
//===----------------------------------------------------------------------===// // C Language Family Front-end //===----------------------------------------------------------------------===// Welcome to Clang. This is a compiler front-end for the C family of languages (C, C++, Objective-C, and Objective-C++) which is built as part of the LLVM compiler infrastructure project. Unlike many other compiler frontends, Clang is useful for a number of things beyond just compiling code: we intend for Clang to be host to a number of different source-level tools. One example of this is the Clang Static Analyzer. If you're interested in more (including how to build Clang) it is best to read the relevant web sites. Here are some pointers: Information on Clang: http://clang.llvm.org/ Building and using Clang: http://clang.llvm.org/get_started.html Clang Static Analyzer: http://clang-analyzer.llvm.org/ Information on the LLVM project: http://llvm.org/ If you have questions or comments about Clang, a great place to discuss them is on the Clang forums: https://discourse.llvm.org/c/clang/ If you find a bug in Clang, please file it in the LLVM bug tracker: http://llvm.org/bugs/