[PATCH] D147920: [clang] Add test for CWG399

Tue Apr 11 11:26:01 PDT 2023

Endill added inline comments.

================
Comment at: clang/test/CXX/drs/dr3xx.cpp:1439
+
+namespace dr399 { // dr399: 11
+                  // NB: reuse dr244 test 
----------------
shafik wrote:
> Endill wrote:
> > Despite a couple of FIXME in CWG244 test (out of dozens of examples), it claims full availability since Clang 11. I'd take a more conservative approach, declaring partial support, but I think that declaring different availability for the same test would bring unnecessary confusion. So I followed CWG244 availability.
> > 
> > Alternative is to demote CWG244 to partial, but I'm not sure we should go back on our claims for CWG support that has been out for so long.
> I think the bugs are not awful, we should file bug reports if we don't already have them. Some of them seem like they should be not too bad to fix.
> 
> CC @aaron.ballman to get a second opinion
If we are to file bug reports, I'm not sure what wording makes those examples ill-formed. Is it [[ http://eel.is/c++draft/basic.lookup#qual.general-4.6 | qual.general-4.6 ]]: `The type-name that is or contains Q shall refer to its (original) lookup context (ignoring cv-qualification) under the interpretation established by at least one (successful) lookup performed.`? I interpret it as requiring names to the left and to the right of `~` to be found in the same scope (lookup context; `namespace dr244` in our case). Could it actually mean that they have to refer to the same type?

Repository:
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  https://reviews.llvm.org/D147920/new/

https://reviews.llvm.org/D147920