li.zhe.hua marked an inline comment as done.
li.zhe.hua added a comment.

In D120360#3341118 <https://reviews.llvm.org/D120360#3341118>, @ymandel wrote:

> High level question: why use `Any` rather than templating?

(Aside: Not sure how to "respond" to comments... just quote in a new comment?)

So, I had a version of this, but I ended up bifurcating the type into 
`RewriteRule` (with no metadata) and `RewriteRuleWith<T>` (with `T` metadata). 
I wasn't sure if the cost of having two types here was worth it. For interfaces 
that didn't care about the metadata generation, there wasn't an easy way to 
accept a `RewriteRule`-like parameter.

Finally, there was a question of migration. All uses of `RewriteRule` with 
`TransformerClangTidyCheck` would need to switch over to 
`RewriteRuleWith<std::string>`, and I wasn't sure how pervasive that might be. 
I'm not set on `Any`, but splitting the type does seem rather costly.


Repository:
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