[Lldb-commits] [lldb] [lldb][test] Combine libstdc++ and libc++ std::variant tests into generic test (PR #147253)

[Michael Buch via lldb-commits]

Michael137 wrote:

Yea I can repro this if I use the same debugger instance to debug a target compiled against libc++, then print the typedef, and then debug a libstdc++ target.

I think the issue is that the formatter infra caches `typedef name -> formatter`. So we would try using the libc++ formatter for a libstdc++ variant because the `V1_typedef` is the thing that was cached.

Same reason as https://github.com/llvm/llvm-project/pull/110767

https://github.com/llvm/llvm-project/pull/147253