AaronBallman wrote:

We talked about this PR a bit in my office hours yesterday and one thing which 
came up for feedback to WG14 is that this should be spelled `_Defer` and not 
`defer` if the committee is serious about the feature (which I believe they 
are). It's going into a TS, and so users have to opt-in for `defer` to become a 
keyword which may break their code. That's fine and we can live with it. But 
when `defer` is rolled into the IS, that makes for a harder migration path. But 
more importantly, we like this feature -- we want to expose it as a conforming 
extension in other language modes; that's not possible with the keyword spelled 
`defer` because that'd be a non-conforming extension. And from looking at 
available open source code, the identifier `defer` is used quite frequently.

https://github.com/llvm/llvm-project/pull/162848
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