Is this feature fully functional in Xcode 16.3 betas? I've tried using it but haven't gotten far, it's unclear to me if I'm using the wrong identifiers (I've read through the thread) or the flags work differently than I thought they would.
In other words setting SWIFT_TREAT_WARNINGS_AS_ERRORS = YES and SWIFT_WARNINGS_AS_WARNING_GROUPS = "DeprecatedDeclaration" doesn't seem to stop any deprecation warnings from being treated as errors. I tried a number of other identifiers suggested in this thread as well.