[clang] [clang][Diagnostics] Highlight code snippets (PR #66514)

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eaeltsin wrote:

I don't understand the push back on introducing a command line flag to disable - it is needed anyway and doesn't prevent further work on the feature. Moreover, I think that all risky features should first appear under the flag, especially when not fully baked.

For us, these crashes block a solid piece of internal testing, thus new unnoticed errors accumulate and make things exponentially harder for the future. By insisting to block until this is resolved you basically block reports for other errors which might be very valuable for the authors of the new commits.


https://github.com/llvm/llvm-project/pull/66514