AaronBallman wrote:

> > which also begs the question as to what change actually caused this to break
> 
> Since I’m not sure how that is usually done here, is bisecting a reasonable 
> approach? I’m asking because rebuilding a project the size of Clang 
> unfortunately ends up taking a rather substantial amount of time...

Bisecting is one useful approach (with the drawback of how resource-intensive 
it is), but you can also sometimes do well with `git blame` on the surrounding 
code to see how the code evolved and what comments there were on the reviews. 

https://github.com/llvm/llvm-project/pull/80959
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