[libc-commits] [libc] [libc][hdrgen] Extend guard attribute support for types (PR #191663)

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un-pixelated wrote:

@Holo-xy
I noticed that there's no test which checks whether an error is being thrown when a type's guard references a macro with 'macro_header` field set to `None`. In my original PR, I had a test case for that, if that's useful could we use that here?

https://github.com/llvm/llvm-project/pull/191663