erichkeane wrote:

> > @AaronBallman @erichkeane Thank you for your comments. There's a question 
> > here about whether to report an error or a warning here, and you're in a 
> > divided opinion. My opinion is that it is better to use the error report 
> > here. Because these are two mutually exclusive conditions, it is 
> > semantically unreasonable to set tail calls or non-tail calls even if the 
> > program is still run after a warning is reported. I still want to hear your 
> > opinions. Regarding the PR title, PR information, test cases, I will fill 
> > in the next submission. Thank you both again.
> 
> I favor an error in this case because the whole point to `musttail` is to 
> _ensure_ that a tail call happens or the code is rejected: 
> https://clang.llvm.org/docs/AttributeReference.html#musttail

I lean towards warning, only because the behavior is 'ignored attribute', and 
those are a specific warning group.

https://github.com/llvm/llvm-project/pull/134465
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