<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/150195>150195</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clangd] crash when parsing the code
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          noirgif
      </td>
    </tr>
</table>

<pre>
    ❯ clangd --version
clangd version 20.1.8 (Fedora 20.1.8-1.fc42)
Features: linux
Platform: aarch64-unknown-linux-gnu; target=aarch64-redhat-linux-gnu 

Constantly crashes at this location.

```
  diff = diff.unaryExpr(
     [this](matrix::Value value) -> matrix::Value {
        if (abs(value) > delta_) {
          if (value > 0) {
              return delta_;
            } else {
              return -delta_;
            }
        }
        return value;
    });
```

Stack dump:
0.      xxxxxx:26:22: current parser token ')'  --> the right bracket after `abs(value`
1.      xxxxxx:6:1: parsing namespace 'xxxxxx'
2.      xxxxxx: parsing function body 'xxxxxx'
3.      xxxxxx: in compound statement ('{}')
4.      xxxxxx: lambda expression parsing
5.      xxxxxx: in compound statement ('{}')


#0 0x0000ffffaf905e0c llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/lib64/libLLVM.so.20.1+0x695e0c)
 #1 0x0000ffffaf9036f0 llvm::sys::RunSignalHandlers() (/lib64/libLLVM.so.20.1+0x6936f0)
 #2 0x0000ffffaf90662c (/lib64/libLLVM.so.20.1+0x69662c)
 #3 0x0000ffffbb240840 (linux-vdso.so.1+0x840)
 #4 0x0000ffffb83b9038 (/lib64/libclang-cpp.so.20.1+0x12c9038)
 #5 0x0000ffffb83b9730 (/lib64/libclang-cpp.so.20.1+0x12c9730)
 #6 0x0000ffffb83af460 clang::Sema::CheckAbsoluteValueFunction(clang::CallExpr const*, clang::FunctionDecl const*) (/lib64/libclang-cpp.so.20.1+0x12bf460)
 #7 0x0000ffffb83ae85c clang::Sema::CheckFunctionCall(clang::FunctionDecl*, clang::CallExpr*, clang::FunctionProtoType const*) (/lib64/libclang-cpp.so.20.1+0x12be85c)
 #8 0x0000ffffb85b49f8 clang::Sema::BuildResolvedCallExpr(clang::Expr*, clang::NamedDecl*, clang::SourceLocation, llvm::ArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool, clang::CallExpr::ADLCallKind) (/lib64/libclang-cpp.so.20.1+0x14c49f8)
 #9 0x0000ffffb88e7658 (/lib64/libclang-cpp.so.20.1+0x17f7658)
#10 0x0000ffffb88e73c8 clang::Sema::BuildOverloadedCallExpr(clang::Scope*, clang::Expr*, clang::UnresolvedLookupExpr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool, bool) (/lib64/libclang-cpp.so.20.1+0x17f73c8)
#11 0x0000ffffb859b638 clang::Sema::BuildCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*, bool, bool) (/lib64/libclang-cpp.so.20.1+0x14ab638)
#12 0x0000ffffb85b2670 clang::Sema::ActOnCallExpr(clang::Scope*, clang::Expr*, clang::SourceLocation, llvm::MutableArrayRef<clang::Expr*>, clang::SourceLocation, clang::Expr*) (/lib64/libclang-cpp.so.20.1+0x14c2670)
#13 0x0000ffffb7773690 clang::Parser::ParsePostfixExpressionSuffix(clang::ActionResult<clang::Expr*, true>) (/lib64/libclang-cpp.so.20.1+0x683690)
#14 0x0000ffffb7775c04 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/lib64/libclang-cpp.so.20.1+0x685c04)
#15 0x0000ffffb77712a0 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/lib64/libclang-cpp.so.20.1+0x6812a0)
#16 0x0000ffffb778d6f4 clang::Parser::ParseCXXCondition(clang::ActionResult<clang::Stmt*, true>*, clang::SourceLocation, clang::Sema::ConditionKind, bool, clang::Parser::ForRangeInfo*, bool) (/lib64/libclang-cpp.so.20.1+0x69d6f4)
#17 0x0000ffffb77e2644 clang::Parser::ParseParenExprOrCondition(clang::ActionResult<clang::Stmt*, true>*, clang::Sema::ConditionResult&, clang::SourceLocation, clang::Sema::ConditionKind, clang::SourceLocation&, clang::SourceLocation&) (/lib64/libclang-cpp.so.20.1+0x6f2644)
#18 0x0000ffffb77dbef4 clang::Parser::ParseIfStatement(clang::SourceLocation*) (/lib64/libclang-cpp.so.20.1+0x6ebef4)
#19 0x0000ffffb77d9370 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/lib64/libclang-cpp.so.20.1+0x6e9370)
#20 0x0000ffffb77d7de8 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/lib64/libclang-cpp.so.20.1+0x6e7de8)
#21 0x0000ffffb77e1bb4 clang::Parser::ParseCompoundStatementBody(bool) (/lib64/libclang-cpp.so.20.1+0x6f1bb4)
#22 0x0000ffffb778a380 clang::Parser::ParseLambdaExpressionAfterIntroducer(clang::LambdaIntroducer&) (/lib64/libclang-cpp.so.20.1+0x69a380)
#23 0x0000ffffb7787d08 clang::Parser::ParseLambdaExpression() (/lib64/libclang-cpp.so.20.1+0x697d08)
#24 0x0000ffffb7776fa4 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/lib64/libclang-cpp.so.20.1+0x686fa4)
#25 0x0000ffffb77712a0 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/lib64/libclang-cpp.so.20.1+0x6812a0)
#26 0x0000ffffb77800a0 clang::Parser::ParseExpressionList(llvm::SmallVectorImpl<clang::Expr*>&, llvm::function_ref<void ()>, bool, bool, bool*) (/lib64/libclang-cpp.so.20.1+0x6900a0)
#27 0x0000ffffb77735f8 clang::Parser::ParsePostfixExpressionSuffix(clang::ActionResult<clang::Expr*, true>) (/lib64/libclang-cpp.so.20.1+0x6835f8)
#28 0x0000ffffb7775c04 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/lib64/libclang-cpp.so.20.1+0x685c04)
#29 0x0000ffffb77712a0 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/lib64/libclang-cpp.so.20.1+0x6812a0)
#30 0x0000ffffb7771cac clang::Parser::ParseRHSOfBinaryExpression(clang::ActionResult<clang::Expr*, true>, clang::prec::Level) (/lib64/libclang-cpp.so.20.1+0x681cac)
#31 0x0000ffffb77712fc clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/lib64/libclang-cpp.so.20.1+0x6812fc)
#32 0x0000ffffb77da8b8 clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) (/lib64/libclang-cpp.so.20.1+0x6ea8b8)
#33 0x0000ffffb77d8684 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/lib64/libclang-cpp.so.20.1+0x6e8684)
#34 0x0000ffffb77d7de8 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/lib64/libclang-cpp.so.20.1+0x6e7de8)
#35 0x0000ffffb77e1bb4 clang::Parser::ParseCompoundStatementBody(bool) (/lib64/libclang-cpp.so.20.1+0x6f1bb4)
#36 0x0000ffffb77e2fc8 clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/lib64/libclang-cpp.so.20.1+0x6f2fc8)
#37 0x0000ffffb77fdd74 clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*) (/lib64/libclang-cpp.so.20.1+0x70dd74)
#38 0x0000ffffb773e014 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/lib64/libclang-cpp.so.20.1+0x64e014)
#39 0x0000ffffb77fcb18 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/lib64/libclang-cpp.so.20.1+0x70cb18)
#40 0x0000ffffb77fc3e4 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/lib64/libclang-cpp.so.20.1+0x70c3e4)
#41 0x0000ffffb77fb5a4 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/lib64/libclang-cpp.so.20.1+0x70b5a4)
#42 0x0000ffffb775a84c clang::Parser::ParseInnerNamespace(llvm::SmallVector<clang::Parser::InnerNamespaceInfo, 4u> const&, unsigned int, clang::SourceLocation&, clang::ParsedAttributes&, clang::BalancedDelimiterTracker&) (/lib64/libclang-cpp.so.20.1+0x66a84c)
#43 0x0000ffffb7759d7c clang::Parser::ParseNamespace(clang::DeclaratorContext, clang::SourceLocation&, clang::SourceLocation) (/lib64/libclang-cpp.so.20.1+0x669d7c)
#44 0x0000ffffb773c438 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/lib64/libclang-cpp.so.20.1+0x64c438)
#45 0x0000ffffb77facbc clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/lib64/libclang-cpp.so.20.1+0x70acbc)
#46 0x0000ffffb77f9a90 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/lib64/libclang-cpp.so.20.1+0x709a90)
#47 0x0000ffffb77253bc clang::ParseAST(clang::Sema&, bool, bool) (/lib64/libclang-cpp.so.20.1+0x6353bc)
#48 0x0000ffffb9b9a324 clang::FrontendAction::Execute() (/lib64/libclang-cpp.so.20.1+0x2aaa324)
#49 0x0000aaab3545f240 (/usr/bin/clangd+0x50f240)
#50 0x0000aaab3546400c (/usr/bin/clangd+0x51400c)
#51 0x0000aaab3545c738 (/usr/bin/clangd+0x50c738)
#52 0x0000aaab354c5e98 (/usr/bin/clangd+0x575e98)
#53 0x0000ffffaedad284 start_thread (/lib64/libc.so.6+0x8d284)
#54 0x0000ffffaee1804c thread_start (/lib64/libc.so.6+0xf804c)
[Error - 5:10:03 PM] Server process exited with signal SIGTRAP.
[Error - 5:10:03 PM] The Clang Language Server server crashed 5 times in the last 3 minutes. The server will not be restarted. See the output for more information.
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzsWktz4zYS_jXwBWUVBPB58IF-KHGtJ3ZZ3lRuUyAJStyhAC0Ieux_v9WkZJCwRJmTSTazm6kp64Xu_vrrRqMBgtd1uZJCXCD_EvnXZ7wxa6UvpCr1qizOUpW_XqAbiuJrlCxwVnG5yvH5-bPQdakkIsnuq90XmJLZfBZhRKOFyJXmuy_O57Mi8yiiMSLJQnDTaFEjluCqlM0LIslDxU2h9Aa-41xn68A7b-QXqb7K83bM-Uo2iF1iw_VKGMSu96O0yNfc2EEYkQSR5ErJ2nBpqlecaV6vRY25wWZd1rhSGTelkrNuJArI7j9JMM7LosCIXbdvZo3k-vXmZasRjdqfMcbIvwQ1yL9GNNpwo8sXxBLEkl951Qj8DH8RjfE5Yjf4_e8ovNxrwhiXBXDF0xrR6E0SBHNRGf65_TQQ2Is8d8rYDSaHBsE_LUyj5V4Tcweg8BqLqnYRDWTPR4R73ww_7WQ7d94kYQyNu899yhFJloZnX3DebLZAFEnIDJH4pf2HWEID-EMhM7JGayEN3nJdC42N-iIkRjQExTTE-Lzl3KwF1uVqbXCqefZFGMwLIzRGAekT3VqfD0yBpTkYAgOlXGHJN6Le8kyAld0wGiKS0IHc2_iikRmkFoaJ48qwoUwpcaY2W9XIHNeGG7EB1yDRaAghAb7CbsZ4Q8mKb9KcY_Gy1aJup93OPiKJ_81Gdv8pI5i8EEJIURQFL2LiC5LhqnredGlcv9bdmwddStPG7knzTCAa2UGaf_2saqMF3yAaIHqFS2naRAXTi6pMA697vbv79dOsVjMoFIhekpcgBoMdJowomztwWFCQQ3AeG7ksV5JXP3OZV0LXramPWQSd1iJ1LAYBzT6kBgZaNaynJk2pRyKPgJquVD3ntQLxTjbyeva9vmDE0piw6L39tvKeZ9vtAMScZjDcKvNdZSEjU5SFrIcsGCrjhReQblXoYrAUG969u1qL7EuS1qpqjGgr32I3NxCNehJXvKqgwOIMCjaiCeRK7_e91LXIqt6YA2E95kIKIK0LoeOCiPxsxIW9fcA5RN5H9h733q_jHj1oZdTT61Z8o1sA3LoVDdzyUy8uosNuXTZllT-KWlXPIrcw-64dBv4L34j8sLdL1ehM3O0WVvjRTtBEa_76KArErg6YYDcnVR0GlipVHeO8s3t9B1_8o5T5FGK9DKizxMYDYiMRBv7HJ2NYwPBdfaVsTlxlLBuL0v2z0JXi-bE4LTO1Fe-jcTh8_5R6F_Q7pb4028OjxiL5qTE8rcQfHNDu9eMBCwtg0XI8H86EOA3YGMffgdkfjzOPAyuWM-pUDxqER-p6kpl7-QNzNqUQAAuWo8FyHoYhC-IBRw9tU9p7_6BqU5QvN29t2rIpivJlSFrSrgWPom4qc9hReoWNhk76ZgL6IAJ4FrzngPcz4o2Cv-K1sciHmPuDYVz7uauzbkoGThz6orD2gfgS-tL3olOCFUTgkHXXd9ydUz4eq6TdB0Nz_BGnHeQTYAIQCzMYwozyoDgRld9-u1IyL9_3UcfzaGk2xs2j07PxcEe0t-0G-wjmhdKPXK7ErSzUoGJ9nLEYOLGMhUPGBA28ccYeuBYSYnqv_xjm3pOzU_Uu97-V5BEVp0wEU6gugExLdTSkOk_FieS8LZb7HaazMDioJs1sAXYtqthBFbNwfGa_YbrX0Lty3YJICiN0Yowu08aIerB3XW54Vf0qMqP00XxgtGnTYay-te9zELpS0ogXcyJYbmp18n2QB625IyZQC-S9UUuJQ22Yi-gbqP2rcDmBB_DU8jB3asw8TU9U5d0Jyxsflyp_RTSaWusKsGRxUGd14CwaT_W79lzILmBtkt9Ko1XeZMLp1rrB_V8n5U4MaCxWpzmKwpyM546L9dhhzTHzYMCad9uboOD_W-0NOGTd_THaG-q2N4ScgGnB3ZW1OVZIbjfb6vieIBjuJfYnsp91u5F4VmXeuRPvdhDDqHxTdGJwzLoduhsFvxifC__ljYJf9GZS9H-1UaDxDzGTGHFhZjwbhfn48_K-uCz3j68O4ZyWUIPgbLXIdquIeBaT1rgIoFvH5u_4L8Yd-_P4L3ownaU451E6PqUB3JFu-ERbM6FtARQWo7ME51EQjc_cvzvj49QCeZZa7-_OuOXB_2t0xixwTwGKbDwe-2cuLo6ezOEHG-8j2x1yTtxYF70Daub0B0Weh-Ms2idNRSkPnGA8dE9_95mm9Ecy5klsthU37dnM_gnUmNQdN8LOqq4_m5JLIQE_LQtOo8EEmY-zAO79pFWzPer8ciuy905YWg5PkA8Wk6PknT6FGUsqe0RWTiQ08IAyS6jTyhRZOh-fFEDMve4l1600QkteHVivphfbdyNGg5Rkmahr-K0sStiMTsgrcPSNBo-4NDBxOq92BXrAxtGp9t3JcPPjd5HBhM0Jz2mvitQ_sS--eelSYLhq_QkETHARnLAuOq2ZzyNvvIO8lVLoX_YXez62JveVDOW7CnCFPVipB3W0ke3Vury7-TLpGPc0hZe84jIT-bWoyk1phH5qrzpNPcUJgC3LpdNC-nEejnPZp3FCyZ16jD3BIYBsHXIaN5Z57HRNPJj3v9el7zFvflcr54HvlhmnlSt4lo6H-keoDOCEddHpEouYn3hg-6S27X62awX7vt1v-b8b8WCcsvDWkrRPqQ806vapzieVN5W43WyV3u9Gp8zUkAB665vTQ1KfHQhfsnxyHsQAnA7kN94cCBhYsjgGXVycxpzRwQKz0DBbZN4dNuyPF0TWAAFTTnwp56DbWt63O5zzlPmeX1Bvf6-tqTWii7SUiC5abXmrwicw5k2DT4YaAo-Q7ISGOYyxGuYOhix8u6h3FAOMsRroUEPmi_iUhhDGWA39ms1FznMaebg2XJvPZq0Fzw8wDMwG3b1DGG6VeQNlYh4RL8Odms-tzlFlBQzfKfMvb7RWGp9jH7FkThBLCMMPn5B_jZdCPwuNt1pBn4PFS2lEjr-WZo3r9gYnXt7-9PSYPMxOaXpaC3wF3OA7LlcNX4m98rp76e5-59jHptyIGpeyvR5c8dpghjelhDo0a_XsJL6WVYWlMjgVWIvWaZHP8FKIVlI1ZtsYXCiNN0oLXMpC6U13n_wsv2B5zGJ-Ji7moc9oQEOPnK0vPO5HNMxIBktSTnwesigXacQDz2fBnJ2VF5RQn4SUkZj6HpmFoR9mnh9wRn0WzinyiNjwsppBszJTenVW1nUjLuY-mcf-WcVTUdXtJX5KpfiK218Rpci_PtMXIHSeNqsaeaQqa1NbNaY0VXv7f5di_nXHGf66Fm_3ilvPM5WLs0ZXF2tjtu2dW7pAdLEqzbpJZ5naQD5AK9W9nG-1-pfIDKKLFkyN6GKH9vmC_icAAP__IMeZqA">