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* [Bug testsuite/102658] New: [12 regression] Many test case failures after r12-4240
@ 2021-10-08 21:52 seurer at gcc dot gnu.org
  2021-10-09  1:06 ` [Bug testsuite/102658] " crazylht at gmail dot com
                   ` (12 more replies)
  0 siblings, 13 replies; 14+ messages in thread
From: seurer at gcc dot gnu.org @ 2021-10-08 21:52 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102658

            Bug ID: 102658
           Summary: [12 regression] Many test case failures after r12-4240
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: testsuite
          Assignee: unassigned at gcc dot gnu.org
          Reporter: seurer at gcc dot gnu.org
  Target Milestone: ---

Looks like some of the test cases were missed in the udpate

previous run: g:50e20ee6e40643c23b53bacda4db4dd9573d7c8a, r12-4239: 66 failures
this run    : g:2b8453c401b699ed93c085d0413ab4b5030bcdb8, r12-4240: 106
failures

FAIL: c-c++-common/Wstringop-overflow-2.c  -Wc++-compat   (test for warnings,
line 226)
FAIL: c-c++-common/Wstringop-overflow-2.c  -Wc++-compat   (test for warnings,
line 227)
FAIL: c-c++-common/Wstringop-overflow-2.c  -Wc++-compat   (test for warnings,
line 325)
FAIL: c-c++-common/Wstringop-overflow-2.c  -Wc++-compat   (test for warnings,
line 326)
FAIL: c-c++-common/Wstringop-overflow-2.c  -std=gnu++14  (test for warnings,
line 226)
FAIL: c-c++-common/Wstringop-overflow-2.c  -std=gnu++14  (test for warnings,
line 227)
FAIL: c-c++-common/Wstringop-overflow-2.c  -std=gnu++14  (test for warnings,
line 325)
FAIL: c-c++-common/Wstringop-overflow-2.c  -std=gnu++14  (test for warnings,
line 326)
FAIL: c-c++-common/Wstringop-overflow-2.c  -std=gnu++17  (test for warnings,
line 226)
FAIL: c-c++-common/Wstringop-overflow-2.c  -std=gnu++17  (test for warnings,
line 227)
FAIL: c-c++-common/Wstringop-overflow-2.c  -std=gnu++17  (test for warnings,
line 325)
FAIL: c-c++-common/Wstringop-overflow-2.c  -std=gnu++17  (test for warnings,
line 326)
FAIL: c-c++-common/Wstringop-overflow-2.c  -std=gnu++2a  (test for warnings,
line 226)
FAIL: c-c++-common/Wstringop-overflow-2.c  -std=gnu++2a  (test for warnings,
line 227)
FAIL: c-c++-common/Wstringop-overflow-2.c  -std=gnu++2a  (test for warnings,
line 325)
FAIL: c-c++-common/Wstringop-overflow-2.c  -std=gnu++2a  (test for warnings,
line 326)
FAIL: c-c++-common/Wstringop-overflow-2.c  -std=gnu++98  (test for warnings,
line 226)
FAIL: c-c++-common/Wstringop-overflow-2.c  -std=gnu++98  (test for warnings,
line 227)
FAIL: c-c++-common/Wstringop-overflow-2.c  -std=gnu++98  (test for warnings,
line 325)
FAIL: c-c++-common/Wstringop-overflow-2.c  -std=gnu++98  (test for warnings,
line 326)
FAIL: g++.dg/warn/Wuninitialized-13.C  -std=gnu++14  (test for warnings, line
8)
FAIL: g++.dg/warn/Wuninitialized-13.C  -std=gnu++17  (test for warnings, line
8)
FAIL: g++.dg/warn/Wuninitialized-13.C  -std=gnu++2a  (test for warnings, line
8)
FAIL: g++.dg/warn/Wuninitialized-13.C  -std=gnu++98  (test for warnings, line
8)
FAIL: gcc.dg/Warray-bounds-51.c  target { i?86-*-* x86_64-*-* }  (test for
warnings, line 41)
FAIL: gcc.dg/Wstringop-overflow-14.c  target { i?86-*-* x86_64-*-* }  (test for
warnings, line 38)
FAIL: gcc.dg/Wstringop-overflow-21.c  (test for warnings, line 29)
FAIL: gcc.dg/Wstringop-overflow-21.c  (test for warnings, line 56)
FAIL: gcc.dg/Wstringop-overflow-76.c  (test for warnings, line 117)
FAIL: gcc.dg/Wstringop-overflow-76.c  (test for warnings, line 33)
FAIL: gcc.dg/Wstringop-overflow-76.c  (test for warnings, line 50)
FAIL: gcc.dg/Wstringop-overflow-76.c  (test for warnings, line 98)
FAIL: gcc.dg/Wstringop-overflow-76.c note (test for warnings, line 105)
FAIL: gcc.dg/Wstringop-overflow-76.c note (test for warnings, line 85)
FAIL: gcc.target/powerpc/dform-1.c scan-assembler lxsd 
FAIL: gcc.target/powerpc/dform-1.c scan-assembler stxsd 
FAIL: gcc.target/powerpc/dform-2.c scan-assembler-not xscvdpspn 
FAIL: gcc.target/powerpc/pr80510-2.c scan-assembler \\mstxsspx\\M
FAIL: gcc.target/powerpc/pr80510-2.c scan-assembler-not \\mmfvsrwz\\M
FAIL: libgomp.graphite/force-parallel-8.c scan-tree-dump-times graphite "5
loops carried no dependency" 1

commit 2b8453c401b699ed93c085d0413ab4b5030bcdb8 (HEAD, refs/bisect/bad)
Author: liuhongt <hongtao.liu@intel.com>
Date:   Mon Sep 6 13:48:49 2021 +0800

    Enable auto-vectorization at O2 with very-cheap cost model.

^ permalink raw reply	[flat|nested] 14+ messages in thread

* [Bug testsuite/102658] [12 regression] Many test case failures after r12-4240
  2021-10-08 21:52 [Bug testsuite/102658] New: [12 regression] Many test case failures after r12-4240 seurer at gcc dot gnu.org
@ 2021-10-09  1:06 ` crazylht at gmail dot com
  2021-10-09  1:51 ` linkw at gcc dot gnu.org
                   ` (11 subsequent siblings)
  12 siblings, 0 replies; 14+ messages in thread
From: crazylht at gmail dot com @ 2021-10-09  1:06 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102658

--- Comment #1 from Hongtao.liu <crazylht at gmail dot com> ---
> Please don't add the -fno- option to the warning tests.  As I said,
> I would prefer to either suppress the vectorization for the failing
> cases by tweaking the test code or xfail them.  That way future
> regressions won't be masked by the option.  Once we've moved
> the warning to a more suitable pass we'll add a new test to verify
> it works as intended or remove the xfails.

Remove -fno-tree-vectorize from the warning tests, and add xfails to them.
The warning information is mainly affected by vectorization of 4 or 2 char
store. Some targets support both, some targets only support one of them,
and some targets supported neither, which means the warning information
would differ from targets to targets.
I only added xfail { x86_64-*-* i?86-*-* }, other backends may need to
re-adjust these xfail.


Also the backend testcases need to be updated

^ permalink raw reply	[flat|nested] 14+ messages in thread

* [Bug testsuite/102658] [12 regression] Many test case failures after r12-4240
  2021-10-08 21:52 [Bug testsuite/102658] New: [12 regression] Many test case failures after r12-4240 seurer at gcc dot gnu.org
  2021-10-09  1:06 ` [Bug testsuite/102658] " crazylht at gmail dot com
@ 2021-10-09  1:51 ` linkw at gcc dot gnu.org
  2021-10-09  2:04 ` linkw at gcc dot gnu.org
                   ` (10 subsequent siblings)
  12 siblings, 0 replies; 14+ messages in thread
From: linkw at gcc dot gnu.org @ 2021-10-09  1:51 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102658

Kewen Lin <linkw at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
                 CC|                            |linkw at gcc dot gnu.org
   Last reconfirmed|                            |2021-10-09
             Status|UNCONFIRMED                 |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |linkw at gcc dot gnu.org

--- Comment #2 from Kewen Lin <linkw at gcc dot gnu.org> ---
I'll take a look.

^ permalink raw reply	[flat|nested] 14+ messages in thread

* [Bug testsuite/102658] [12 regression] Many test case failures after r12-4240
  2021-10-08 21:52 [Bug testsuite/102658] New: [12 regression] Many test case failures after r12-4240 seurer at gcc dot gnu.org
  2021-10-09  1:06 ` [Bug testsuite/102658] " crazylht at gmail dot com
  2021-10-09  1:51 ` linkw at gcc dot gnu.org
@ 2021-10-09  2:04 ` linkw at gcc dot gnu.org
  2021-10-09 10:39 ` linkw at gcc dot gnu.org
                   ` (9 subsequent siblings)
  12 siblings, 0 replies; 14+ messages in thread
From: linkw at gcc dot gnu.org @ 2021-10-09  2:04 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102658

--- Comment #3 from Kewen Lin <linkw at gcc dot gnu.org> ---
Some new XPASS:
XFAIL->XPASS: gcc.dg/Wstringop-overflow-68.c pr101475 (test for warnings, line
61)
XFAIL->XPASS: gcc.dg/Wstringop-overflow-68.c pr101475 (test for warnings, line
62)
XFAIL->XPASS: gcc.dg/Wstringop-overflow-68.c pr101475 (test for warnings, line
63)
XFAIL->XPASS: gcc.dg/Wstringop-overflow-68.c pr101475 (test for warnings, line
64)

One new FAIL spotted:
PASS->FAIL: gcc.dg/guality/pr54693-2.c   -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects  -DPREVENT_OPTIMIZATION line 21 x == 10 - i

which is from guality, not sure whether we want to recover the original
behavior since there are already some existing FAILs before. The reason why it
fails is that O2 loop vect enables dce6 which takes x in PHI useless and remove
it, further stops to reuse i for x's debug information.

^ permalink raw reply	[flat|nested] 14+ messages in thread

* [Bug testsuite/102658] [12 regression] Many test case failures after r12-4240
  2021-10-08 21:52 [Bug testsuite/102658] New: [12 regression] Many test case failures after r12-4240 seurer at gcc dot gnu.org
                   ` (2 preceding siblings ...)
  2021-10-09  2:04 ` linkw at gcc dot gnu.org
@ 2021-10-09 10:39 ` linkw at gcc dot gnu.org
  2021-10-11  8:37 ` rguenth at gcc dot gnu.org
                   ` (8 subsequent siblings)
  12 siblings, 0 replies; 14+ messages in thread
From: linkw at gcc dot gnu.org @ 2021-10-09 10:39 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102658

--- Comment #4 from Kewen Lin <linkw at gcc dot gnu.org> ---
Created attachment 51576
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51576&action=edit
rs6000-test-Adjust-test-cases-due-to-O2-vect

Tested successfully on P9LE, note that it relies on r12-4273.

Still checking force-parallel-8.c is one target specific failure or not.

^ permalink raw reply	[flat|nested] 14+ messages in thread

* [Bug testsuite/102658] [12 regression] Many test case failures after r12-4240
  2021-10-08 21:52 [Bug testsuite/102658] New: [12 regression] Many test case failures after r12-4240 seurer at gcc dot gnu.org
                   ` (3 preceding siblings ...)
  2021-10-09 10:39 ` linkw at gcc dot gnu.org
@ 2021-10-11  8:37 ` rguenth at gcc dot gnu.org
  2021-10-11 14:54 ` msebor at gcc dot gnu.org
                   ` (7 subsequent siblings)
  12 siblings, 0 replies; 14+ messages in thread
From: rguenth at gcc dot gnu.org @ 2021-10-11  8:37 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102658

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |12.0

^ permalink raw reply	[flat|nested] 14+ messages in thread

* [Bug testsuite/102658] [12 regression] Many test case failures after r12-4240
  2021-10-08 21:52 [Bug testsuite/102658] New: [12 regression] Many test case failures after r12-4240 seurer at gcc dot gnu.org
                   ` (4 preceding siblings ...)
  2021-10-11  8:37 ` rguenth at gcc dot gnu.org
@ 2021-10-11 14:54 ` msebor at gcc dot gnu.org
  2021-10-13  2:18 ` linkw at gcc dot gnu.org
                   ` (6 subsequent siblings)
  12 siblings, 0 replies; 14+ messages in thread
From: msebor at gcc dot gnu.org @ 2021-10-11 14:54 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102658

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |msebor at gcc dot gnu.org

--- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> ---
Please don't add xfails for regressions without referencing the bug that tracks
the underlying root cause.

Also, the target-specific conditionals in the xfails are going to be difficult
to maintain.  We need a better solution than that.  That said, it would seem
prudent to discuss such a large number of regressions with the author of the
affected features/warnings (yours truly in this case).

^ permalink raw reply	[flat|nested] 14+ messages in thread

* [Bug testsuite/102658] [12 regression] Many test case failures after r12-4240
  2021-10-08 21:52 [Bug testsuite/102658] New: [12 regression] Many test case failures after r12-4240 seurer at gcc dot gnu.org
                   ` (5 preceding siblings ...)
  2021-10-11 14:54 ` msebor at gcc dot gnu.org
@ 2021-10-13  2:18 ` linkw at gcc dot gnu.org
  2021-10-13  2:24 ` linkw at gcc dot gnu.org
                   ` (5 subsequent siblings)
  12 siblings, 0 replies; 14+ messages in thread
From: linkw at gcc dot gnu.org @ 2021-10-13  2:18 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102658

--- Comment #6 from Kewen Lin <linkw at gcc dot gnu.org> ---
*** Bug 102713 has been marked as a duplicate of this bug. ***

^ permalink raw reply	[flat|nested] 14+ messages in thread

* [Bug testsuite/102658] [12 regression] Many test case failures after r12-4240
  2021-10-08 21:52 [Bug testsuite/102658] New: [12 regression] Many test case failures after r12-4240 seurer at gcc dot gnu.org
                   ` (6 preceding siblings ...)
  2021-10-13  2:18 ` linkw at gcc dot gnu.org
@ 2021-10-13  2:24 ` linkw at gcc dot gnu.org
  2021-10-13  5:22 ` cvs-commit at gcc dot gnu.org
                   ` (4 subsequent siblings)
  12 siblings, 0 replies; 14+ messages in thread
From: linkw at gcc dot gnu.org @ 2021-10-13  2:24 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102658

--- Comment #7 from Kewen Lin <linkw at gcc dot gnu.org> ---
r12-4273 caused some new expected failures:

FAIL: c-c++-common/Wstringop-overflow-2.c  -Wc++-compat  (test for excess
errors)
FAIL: c-c++-common/Wstringop-overflow-2.c  -std=gnu++14 (test for excess
errors)
FAIL: c-c++-common/Wstringop-overflow-2.c  -std=gnu++17 (test for excess
errors)
FAIL: c-c++-common/Wstringop-overflow-2.c  -std=gnu++2a (test for excess
errors)
FAIL: c-c++-common/Wstringop-overflow-2.c  -std=gnu++98 (test for excess
errors)
FAIL: gcc.dg/Warray-parameter-3.c (test for excess errors)
FAIL: gcc.dg/Wstringop-overflow-21.c (test for excess errors)
FAIL: gcc.dg/Wstringop-overflow-76.c (test for excess errors)

which have been considered in the associated patch already.

^ permalink raw reply	[flat|nested] 14+ messages in thread

* [Bug testsuite/102658] [12 regression] Many test case failures after r12-4240
  2021-10-08 21:52 [Bug testsuite/102658] New: [12 regression] Many test case failures after r12-4240 seurer at gcc dot gnu.org
                   ` (7 preceding siblings ...)
  2021-10-13  2:24 ` linkw at gcc dot gnu.org
@ 2021-10-13  5:22 ` cvs-commit at gcc dot gnu.org
  2021-10-13  5:49 ` linkw at gcc dot gnu.org
                   ` (3 subsequent siblings)
  12 siblings, 0 replies; 14+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-10-13  5:22 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102658

--- Comment #8 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Kewen Lin <linkw@gcc.gnu.org>:

https://gcc.gnu.org/g:a124c1b0a2595f285c0d8ed863b37b83e14a6566

commit r12-4364-ga124c1b0a2595f285c0d8ed863b37b83e14a6566
Author: Kewen Lin <linkw@linux.ibm.com>
Date:   Wed Oct 13 00:20:45 2021 -0500

    rs6000/test: Adjust test cases due to O2 vect [PR102658]

    Commit r12-4240 enables vectorization at O2, this patch is to
    adjust some test cases for rs6000 port accordingly.

    It simply adds -fno-tree-vectorize to retain original test points.

    gcc/testsuite/ChangeLog:

            PR testsuite/102658
            * gcc.target/powerpc/dform-1.c: Adjust as vectorization enabled at
O2.
            * gcc.target/powerpc/dform-2.c: Likewise.
            * gcc.target/powerpc/pr80510-2.c: Likewise.

^ permalink raw reply	[flat|nested] 14+ messages in thread

* [Bug testsuite/102658] [12 regression] Many test case failures after r12-4240
  2021-10-08 21:52 [Bug testsuite/102658] New: [12 regression] Many test case failures after r12-4240 seurer at gcc dot gnu.org
                   ` (8 preceding siblings ...)
  2021-10-13  5:22 ` cvs-commit at gcc dot gnu.org
@ 2021-10-13  5:49 ` linkw at gcc dot gnu.org
  2021-10-13  5:51 ` crazylht at gmail dot com
                   ` (2 subsequent siblings)
  12 siblings, 0 replies; 14+ messages in thread
From: linkw at gcc dot gnu.org @ 2021-10-13  5:49 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102658

--- Comment #9 from Kewen Lin <linkw at gcc dot gnu.org> ---
There are some discussions [1] to improve the fixing way for the test cases in
g++.dg and c-c++-common. So I hold the changes adding powerpc*-*-* onto them,
just updated the testcases under gcc.target/powerpc/. Will revisit them once
one better solution comes out.

For the failure:
  FAIL: libgomp.graphite/force-parallel-8.c scan-tree-dump-times graphite "5
loops carried no dependency" 1

It's not a target specific failure, Hongtao already posted one patch [2] for
it.

[1] https://gcc.gnu.org/pipermail/gcc-patches/2021-October/581371.html
[2] https://gcc.gnu.org/pipermail/gcc-patches/2021-October/581260.html

^ permalink raw reply	[flat|nested] 14+ messages in thread

* [Bug testsuite/102658] [12 regression] Many test case failures after r12-4240
  2021-10-08 21:52 [Bug testsuite/102658] New: [12 regression] Many test case failures after r12-4240 seurer at gcc dot gnu.org
                   ` (9 preceding siblings ...)
  2021-10-13  5:49 ` linkw at gcc dot gnu.org
@ 2021-10-13  5:51 ` crazylht at gmail dot com
  2021-10-13  5:57 ` linkw at gcc dot gnu.org
  2021-10-20  6:30 ` linkw at gcc dot gnu.org
  12 siblings, 0 replies; 14+ messages in thread
From: crazylht at gmail dot com @ 2021-10-13  5:51 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102658

--- Comment #10 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Kewen Lin from comment #9)
> There are some discussions [1] to improve the fixing way for the test cases
> in g++.dg and c-c++-common. So I hold the changes adding powerpc*-*-* onto
> them, just updated the testcases under gcc.target/powerpc/. Will revisit
> them once one better solution comes out.
> 
> For the failure:
>   FAIL: libgomp.graphite/force-parallel-8.c scan-tree-dump-times graphite "5
> loops carried no dependency" 1
> 
> It's not a target specific failure, Hongtao already posted one patch [2] for
> it.
> 
> [1] https://gcc.gnu.org/pipermail/gcc-patches/2021-October/581371.html
> [2] https://gcc.gnu.org/pipermail/gcc-patches/2021-October/581260.html

Should be fixed by r12-4338

^ permalink raw reply	[flat|nested] 14+ messages in thread

* [Bug testsuite/102658] [12 regression] Many test case failures after r12-4240
  2021-10-08 21:52 [Bug testsuite/102658] New: [12 regression] Many test case failures after r12-4240 seurer at gcc dot gnu.org
                   ` (10 preceding siblings ...)
  2021-10-13  5:51 ` crazylht at gmail dot com
@ 2021-10-13  5:57 ` linkw at gcc dot gnu.org
  2021-10-20  6:30 ` linkw at gcc dot gnu.org
  12 siblings, 0 replies; 14+ messages in thread
From: linkw at gcc dot gnu.org @ 2021-10-13  5:57 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102658

--- Comment #11 from Kewen Lin <linkw at gcc dot gnu.org> ---
> > For the failure:
> >   FAIL: libgomp.graphite/force-parallel-8.c scan-tree-dump-times graphite "5
> > loops carried no dependency" 1
> > 
> > It's not a target specific failure, Hongtao already posted one patch [2] for
> > it.
> > 
> > [2] https://gcc.gnu.org/pipermail/gcc-patches/2021-October/581260.html
> 
> Should be fixed by r12-4338

Nice, thanks!

^ permalink raw reply	[flat|nested] 14+ messages in thread

* [Bug testsuite/102658] [12 regression] Many test case failures after r12-4240
  2021-10-08 21:52 [Bug testsuite/102658] New: [12 regression] Many test case failures after r12-4240 seurer at gcc dot gnu.org
                   ` (11 preceding siblings ...)
  2021-10-13  5:57 ` linkw at gcc dot gnu.org
@ 2021-10-20  6:30 ` linkw at gcc dot gnu.org
  12 siblings, 0 replies; 14+ messages in thread
From: linkw at gcc dot gnu.org @ 2021-10-20  6:30 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102658

Kewen Lin <linkw at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #12 from Kewen Lin <linkw at gcc dot gnu.org> ---
I think Hongtao's recent commit r12-4523 would fix the remaining failures, mark
this resolved, please reopen it if I'm wrong.

^ permalink raw reply	[flat|nested] 14+ messages in thread

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