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This is motivated by the upcoming refactor of libc++'s `__compressed_pair` in https://github.com/llvm/llvm-project/pull/76756 As this will require changes to numerous LLDB libc++ data-formatters (see early draft https://github.com/llvm/llvm-project/pull/96538), it would be nice to have a test-suite that will actually exercise both the old and new layout. We have a matrix bot that tests old versions of Clang (but currently those only date back to Clang-15). Having them in the test-suite will give us quicker signal on what broke. We have an existing test that exercises various layouts of `std::string` over time in `TestDataFormatterLibcxxStringSimulator.py`, but that's the only STL type we have it for. This patch proposes a new `libcxx-simulators` directory which will take the same approach for all the STL types that we can feasibly support in this way (as @labath points out, for some types this might just not be possible due to their implementation complexity). Nonetheless, it'd be great to have a record of how the layout of libc++ types changed over time. Some related discussion: * https://github.com/llvm/llvm-project/pull/97568#issuecomment-2213426804