sammccall added a comment.

In https://reviews.llvm.org/D54061#1286956, @JonasToth wrote:

> > Theoretically, we could replace `ClangTidyCheck::check` with 
> > `ClangTidyCheck::run`, but I'm not sure it is worth, 
> > `ClangTidyCheck::check` is a public API, and is widely-used (for all 
> > clang-tidy checks), replacing it requires large changes (although it is 
> > one-line change), it might break downstream clang-tidy checks.
>
> We can add a deprecation warning and remove the `check` method in the
>  next version?


As Haojian says, this is a lot of churn.
I don't think the benefit of pushing people to migrate, even with a grace 
period, is clear.

Additionally it's *possible* that future refactorings may mean we want to run 
additional "framework" logic when the MatchFinder calls us, and so requiring 
`ClangTidy::check` and `MatchCallback::run` to be the same function seems a 
little risky.

I'll add a comment explaining why the two functions exist.


Repository:
  rCTE Clang Tools Extra

https://reviews.llvm.org/D54061



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