[PATCH] D56731: Add -Wimplicit-ctad warning to diagnose CTAD on types with no user defined deduction guides.

[James Dennett via Phabricator via cfe-commits]

jdennett added a comment.

In D56731#1358907 <https://reviews.llvm.org/D56731#1358907>, @Quuxplusone wrote:

> For my own use-cases, I will continue to want a 100% comprehensive `-Wctad`. All these "heuristics" you're proposing seem very ad-hoc, and make a lot of work for the compiler vendor, and seem complicated enough that I would still worry about bugs slipping through the cracks. Whereas, if the user can simply 100% outlaw CTAD, then they don't ever have to worry.


That's fair; I don't think anyone here is speaking against such a diagnostic (though maybe the name will be a bikeshed).  It's just that this patch is a solution for a different problem: allowing the sufficiently safe uses of CTAD without allowing too many bugs.


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https://reviews.llvm.org/D56731