riccibruno added inline comments.

================
Comment at: 
clang-tools-extra/test/clang-tidy/checkers/modernize-use-trailing-return-type.cpp:1
-// RUN: %check_clang_tidy -std=c++14,c++17 %s 
modernize-use-trailing-return-type %t -- -- -fdeclspec -fexceptions
+// RUN: %check_clang_tidy -std=c++14-or-later %s 
modernize-use-trailing-return-type %t -- -- -fdeclspec -fexceptions 
-DCOMMAND_LINE_INT=int
 // FIXME: Fix the checker to work in C++20 mode, it is performing a
----------------
riccibruno wrote:
> aaron.ballman wrote:
> > bernhardmgruber wrote:
> > > aaron.ballman wrote:
> > > > The change to the language standard line makes me wonder if the fixme 
> > > > below it is now stale, or if the test will fail in C++20 mode.
> > > I just ran the tests again using `python .\check_clang_tidy.py -std=c++20 
> > > .\checkers\modernize-use-trailing-return-type.cpp 
> > > modernize-use-trailing-return-type aa -- -- -DCOMMAND_LINE_INT=int` and I 
> > > did not see mentioning of the use of an uninitialized variable. But I run 
> > > on Windows, maybe the issue just surfaces on another OS? Is there a way 
> > > to trigger the CI again?
> > > 
> > > I removed the FIXME in question in the hope the issue resolved itself.
> > > But I run on Windows, maybe the issue just surfaces on another OS? Is 
> > > there a way to trigger the CI again?
> > 
> > I also run on Windows so I can't easily test the behavior elsewhere for 
> > you. The CI will get triggered on new patch uploads, but I still don't 
> > always trust it. The bots are usually a more reliable source of CI truth 
> > but we have no way to speculatively trigger all the bots.
> I can run it for you with asan/msan.
No warning with either asan or msan on x86-64 linux with clang 10.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D80514/new/

https://reviews.llvm.org/D80514

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