[cfe-dev] AST matcher "refersToType"

[Brian Schiller via cfe-dev]

I believe I've found a mistake in the documentation for the `refersToType`
AST matcher:
https://clang.llvm.org/docs/LibASTMatchersReference.html#refersToType0

The example code makes use of a matcher called `class`, but I am unable to
find such a matcher in the docs, and when I try to use it in clang-query I
get a "matcher not found" error.

I'd be happy to make a patch to the docs, but am actually having trouble
using the `refersToType` matcher at the moment. I'm trying to match calls
to `std::make_unique` specialized with a particular class. That is, I want
`std::make_unique<Demo::Widget>`, but not
`std::make_unique<Something::Else>`. I'd also be happy with a way to filter
for the correct matches in the MatchCallback.

There's a stackoverflow post with a complete code example and a couple
things I've tried available at https://stackoverflow.com/q/58443058/1586229

Thanks,
-Brian
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