llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-x86_64-debian-fast` 
running on `gribozavr4` while building `clang` at step 6 
"test-build-unified-tree-check-all".

Full details are available at: 
https://lab.llvm.org/buildbot/#/builders/56/builds/659

Here is the relevant piece of the build log for the reference:
```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'Clang :: Index/overriding-ftemplate-comments.cpp' 
FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 1: rm -rf 
/b/1/clang-x86_64-debian-fast/llvm.obj/tools/clang/test/Index/Output/overriding-ftemplate-comments.cpp.tmp
+ rm -rf 
/b/1/clang-x86_64-debian-fast/llvm.obj/tools/clang/test/Index/Output/overriding-ftemplate-comments.cpp.tmp
RUN: at line 2: mkdir 
/b/1/clang-x86_64-debian-fast/llvm.obj/tools/clang/test/Index/Output/overriding-ftemplate-comments.cpp.tmp
+ mkdir 
/b/1/clang-x86_64-debian-fast/llvm.obj/tools/clang/test/Index/Output/overriding-ftemplate-comments.cpp.tmp
RUN: at line 3: /b/1/clang-x86_64-debian-fast/llvm.obj/bin/c-index-test 
-test-load-source all 
-comments-xml-schema=/b/1/clang-x86_64-debian-fast/llvm.src/clang/test/Index/../../bindings/xml/comment-xml-schema.rng
 
/b/1/clang-x86_64-debian-fast/llvm.src/clang/test/Index/overriding-ftemplate-comments.cpp
 > 
/b/1/clang-x86_64-debian-fast/llvm.obj/tools/clang/test/Index/Output/overriding-ftemplate-comments.cpp.tmp/out
+ /b/1/clang-x86_64-debian-fast/llvm.obj/bin/c-index-test -test-load-source all 
-comments-xml-schema=/b/1/clang-x86_64-debian-fast/llvm.src/clang/test/Index/../../bindings/xml/comment-xml-schema.rng
 
/b/1/clang-x86_64-debian-fast/llvm.src/clang/test/Index/overriding-ftemplate-comments.cpp
RUN: at line 4: /b/1/clang-x86_64-debian-fast/llvm.obj/bin/FileCheck 
/b/1/clang-x86_64-debian-fast/llvm.src/clang/test/Index/overriding-ftemplate-comments.cpp
 < 
/b/1/clang-x86_64-debian-fast/llvm.obj/tools/clang/test/Index/Output/overriding-ftemplate-comments.cpp.tmp/out
+ /b/1/clang-x86_64-debian-fast/llvm.obj/bin/FileCheck 
/b/1/clang-x86_64-debian-fast/llvm.src/clang/test/Index/overriding-ftemplate-comments.cpp
/b/1/clang-x86_64-debian-fast/llvm.src/clang/test/Index/overriding-ftemplate-comments.cpp:80:11:
 error: CHECK: expected string not found in input
// CHECK: FullCommentAsXML=[<Function templateKind="template" 
file="{{[^"]+}}overriding-ftemplate-comments.cpp" line="[[@LINE-2]]" 
column="6"><Name>comment_to_html_conversion_22</Name><USR>c:@FT@&gt;2#T#t&gt;2#T#t&gt;2#T#Tcomment_to_html_conversion_22#v#</USR><Declaration>template
 &lt;class C1, template &lt;class C2, template &lt;class C3, class C4&gt; class 
BBB&gt;\n class AAA&gt;\nvoid 
comment_to_html_conversion_22()</Declaration><TemplateParameters><Parameter><Name>C1</Name><Index>0</Index><Discussion><Para>
 Ccc 1 
</Para></Discussion></Parameter><Parameter><Name>AAA</Name><Index>1</Index><Discussion><Para>
 Zzz 
</Para></Discussion></Parameter><Parameter><Name>C2</Name><Discussion><Para> 
Ccc 2 
</Para></Discussion></Parameter><Parameter><Name>C3</Name><Discussion><Para> 
Ccc 3 
</Para></Discussion></Parameter><Parameter><Name>C4</Name><Discussion><Para> 
Ccc 4 
</Para></Discussion></Parameter><Parameter><Name>BBB</Name><Discussion><Para> 
Bbb</Para></Discussion></Parameter></TemplateParameters></Function>]
          ^
<stdin>:604:1454: note: scanning from here
// CHECK: overriding-ftemplate-comments.cpp:65:6: 
FunctionTemplate=comment_to_html_conversion_21:65:6 RawComment=[/// \tparam AAA 
Aaa\n/// \tparam BBB Bbb\n/// \tparam CCC Ccc\n/// \tparam DDD Ddd] 
RawCommentRange=[55:1 - 58:20] FullCommentAsHTML=[<dl><dt 
class="tparam-name-index-0">PPP</dt><dd class="tparam-descr-index-0"> Aaa 
</dd><dt class="tparam-name-index-other">QQQ</dt><dd 
class="tparam-descr-index-other"> Bbb </dd><dt 
class="tparam-name-index-other">RRR</dt><dd class="tparam-descr-index-other"> 
Ccc </dd><dt class="tparam-name-index-other">SSS</dt><dd 
class="tparam-descr-index-other"> Ddd</dd></dl>] FullCommentAsXML=[<Function 
templateKind="template" 
file="/b/1/clang-x86_64-debian-fast/llvm.src/clang/test/Index/overriding-ftemplate-comments.cpp"
 line="65" 
column="6"><Name>comment_to_html_conversion_21</Name><USR>c:@FT@&gt;1#t&gt;2#t&gt;1#T#Tcomment_to_html_conversion_21#v#</USR><Declaration>template
 &lt;template &lt;template &lt;typename RRR&gt; class SSS, class QQQ&gt; class 
PPP&gt;\nvoid 
comment_to_html_conversion_21()</Declaration><TemplateParameters><Parameter><Name>PPP</Name><Index>0</Index><Discussion><Para>
 Aaa 
</Para></Discussion></Parameter><Parameter><Name>QQQ</Name><Discussion><Para> 
Bbb 
</Para></Discussion></Parameter><Parameter><Name>RRR</Name><Discussion><Para> 
Ccc 
</Para></Discussion></Parameter><Parameter><Name>SSS</Name><Discussion><Para> 
Ddd</Para></Discussion></Parameter></TemplateParameters></Function>] 
CommentXMLValid
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
             ^
<stdin>:604:1454: note: with "@LINE-2" equal to "78"
// CHECK: overriding-ftemplate-comments.cpp:65:6: 
FunctionTemplate=comment_to_html_conversion_21:65:6 RawComment=[/// \tparam AAA 
Aaa\n/// \tparam BBB Bbb\n/// \tparam CCC Ccc\n/// \tparam DDD Ddd] 
RawCommentRange=[55:1 - 58:20] FullCommentAsHTML=[<dl><dt 
class="tparam-name-index-0">PPP</dt><dd class="tparam-descr-index-0"> Aaa 
</dd><dt class="tparam-name-index-other">QQQ</dt><dd 
class="tparam-descr-index-other"> Bbb </dd><dt 
class="tparam-name-index-other">RRR</dt><dd class="tparam-descr-index-other"> 
Ccc </dd><dt class="tparam-name-index-other">SSS</dt><dd 
class="tparam-descr-index-other"> Ddd</dd></dl>] FullCommentAsXML=[<Function 
templateKind="template" 
file="/b/1/clang-x86_64-debian-fast/llvm.src/clang/test/Index/overriding-ftemplate-comments.cpp"
 line="65" 
column="6"><Name>comment_to_html_conversion_21</Name><USR>c:@FT@&gt;1#t&gt;2#t&gt;1#T#Tcomment_to_html_conversion_21#v#</USR><Declaration>template
 &lt;template &lt;template &lt;typename RRR&gt; class SSS, class QQQ&gt; class 
PPP&gt;\nvoid 
comment_to_html_conversion_21()</Declaration><TemplateParameters><Parameter><Name>PPP</Name><Index>0</Index><Discussion><Para>
 Aaa 
</Para></Discussion></Parameter><Parameter><Name>QQQ</Name><Discussion><Para> 
Bbb 
</Para></Discussion></Parameter><Parameter><Name>RRR</Name><Discussion><Para> 
Ccc 
</Para></Discussion></Parameter><Parameter><Name>SSS</Name><Discussion><Para> 
Ddd</Para></Discussion></Parameter></TemplateParameters></Function>] 
CommentXMLValid
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
             ^

Input file: <stdin>
Check file: 
/b/1/clang-x86_64-debian-fast/llvm.src/clang/test/Index/overriding-ftemplate-comments.cpp

-dump-input=help explains the following input dump.

Input was:
<<<<<<
            .
            .
            .
          599: // CHECK: (CXComment_Text Text=[ Ddd]))))] Extent=[59:1 - 60:37] 
          600: // CHECK: overriding-ftemplate-comments.cpp:59:70: 
TemplateTemplateParameter=AAA:59:70 (Definition) Extent=[59:10 - 59:73] 
[access=public] 
          601: // CHECK: overriding-ftemplate-comments.cpp:59:48: 
TemplateTemplateParameter=DDD:59:48 (Definition) Extent=[59:19 - 59:51] 
[access=public] 
          602: // CHECK: overriding-ftemplate-comments.cpp:59:37: 
TemplateTypeParameter=CCC:59:37 (Definition) Extent=[59:28 - 59:40] 
[access=public] 
          603: // CHECK: overriding-ftemplate-comments.cpp:59:59: 
TemplateTypeParameter=BBB:59:59 (Definition) Extent=[59:53 - 59:62] 
[access=public] 
          604: // CHECK: overriding-ftemplate-comments.cpp:65:6: 
FunctionTemplate=comment_to_html_conversion_21:65:6 RawComment=[/// \tparam AAA 
Aaa\n/// \tparam BBB Bbb\n/// \tparam CCC Ccc\n/// \tparam DDD Ddd] 
RawCommentRange=[55:1 - 58:20] FullCommentAsHTML=[<dl><dt 
class="tparam-name-index-0">PPP</dt><dd class="tparam-descr-index-0"> Aaa 
</dd><dt class="tparam-name-index-other">QQQ</dt><dd 
class="tparam-descr-index-other"> Bbb </dd><dt 
class="tparam-name-index-other">RRR</dt><dd class="tparam-descr-index-other"> 
Ccc </dd><dt class="tparam-name-index-other">SSS</dt><dd 
class="tparam-descr-index-other"> Ddd</dd></dl>] FullCommentAsXML=[<Function 
templateKind="template" 
file="/b/1/clang-x86_64-debian-fast/llvm.src/clang/test/Index/overriding-ftemplate-comments.cpp"
 line="65" 
column="6"><Name>comment_to_html_conversion_21</Name><USR>c:@FT@&gt;1#t&gt;2#t&gt;1#T#Tcomment_to_html_conversion_21#v#</USR><Declaration>template
 &lt;template &lt;template &lt;typename RRR&gt; class SSS, class QQQ&gt; class 
PPP&gt;\nvoid 
comment_to_html_conversion_21()</Declaration><TemplateParameters><Parameter><Name>PPP</Name><Index>0</Index><Discussion><Para>
 Aaa 
</Para></Discussion></Parameter><Parameter><Name>QQQ</Name><Discussion><Para> 
Bbb 
</Para></Discussion></Parameter><Parameter><Name>RRR</Name><Discussion><Para> 
Ccc 
</Para></Discussion></Parameter><Parameter><Name>SSS</Name><Discussion><Para> 
Ddd</Para></Discussion></Parameter></TemplateParameters></Function>] 
CommentXMLValid 
check:80'0                                                                      
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                            X~~~~~~~~~~~~~~~~ error: no match found
check:80'1                                                                      
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                              with "@LINE-2" equal to "78"
          605: // CHECK: CommentAST=[ 
check:80'0     ~~~~~~~~~~~~~~~~~~~~~~~
          606: // CHECK: (CXComment_FullComment 
check:80'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          607: // CHECK: (CXComment_Paragraph IsWhitespace 
check:80'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          608: // CHECK: (CXComment_Text Text=[ ] IsWhitespace)) 
check:80'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          609: // CHECK: (CXComment_TParamCommand ParamName=[AAA] 
ParamPosition={0} 
...

```

https://github.com/llvm/llvm-project/pull/95025
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