erichkeane added a comment.

In D146178#4312473 <https://reviews.llvm.org/D146178#4312473>, @davidtgoldblatt 
wrote:

> This breaks ~the world in the versions of libstdc++ I can easily check -- see 
> e.g. https://gcc.godbolt.org/z/ETeGzc3ve (crashes at this commit, changes to 
> an error at ce861ec782ae3f41807b61e855512aaccf3c2149 
> <https://reviews.llvm.org/rGce861ec782ae3f41807b61e855512aaccf3c2149>).
>
> I'm not deep enough into this nook of the language to tell if the bug is here 
> or libstdc++, though.

Anything that is fixed by e861ec782 is almost definitely a clang bug. I 
objected to that quite strongly in this patch, and am quite disappointed that 
it made it back in.  We're likely going to have a significant number of clang 
bugs that were previously an assert now be an odd, incorrect diagnostic.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D146178/new/

https://reviews.llvm.org/D146178

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