[clang] crash on the simplest code.

[yaoxinliu]

#include <concepts>

template<typename T>
concept IsOK = []<typename U> consteval -> bool {    
    return requires { requires std::same_as<typename U::InnerType, void>; };
}.template operator()<T>();

static_assert(!IsOK<int>);

int main() {}

The above code is simple and legal. However, clangd will crash when parsing it.

This is a regression back to clang-16. clang-15 is ok, see https://godbolt.org/z/e5jof54eo

Related issue: #141732

[tbaederr]

This also happens with clang: https://godbolt.org/z/YhYhcMv4Y

 #0 0x0000000003c7e538 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3c7e538)
 #1 0x0000000003c7c67c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x3c7c67c)
 #2 0x0000000003bcce48 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x0000752e6b042520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00000000074c610c clang::StmtVisitorBase<llvm::make_const_ptr, (anonymous namespace)::IntExprEvaluator, bool>::Visit(clang::Stmt const*) ExprConstant.cpp:0:0
 #5 0x000000000748b83e Evaluate(clang::APValue&, (anonymous namespace)::EvalInfo&, clang::Expr const*) ExprConstant.cpp:0:0
 #6 0x00000000074a419a EvaluateInPlace(clang::APValue&, (anonymous namespace)::EvalInfo&, (anonymous namespace)::LValue const&, clang::Expr const*, bool) ExprConstant.cpp:0:0
 #7 0x00000000074ac694 clang::Expr::EvaluateAsConstantExpr(clang::Expr::EvalResult&, clang::ASTContext const&, clang::Expr::ConstantExprKind) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x74ac694)
 #8 0x000000000654c6a9 calculateConstraintSatisfaction(clang::Sema&, clang::Expr const*, clang::NamedDecl const*, clang::SourceLocation, clang::MultiLevelTemplateArgumentList const&, clang::ConstraintSatisfaction&) SemaConcept.cpp:0:0
 #9 0x000000000654de99 CheckConstraintSatisfaction(clang::Sema&, clang::NamedDecl const*, llvm::ArrayRef<clang::AssociatedConstraint>, llvm::SmallVectorImpl<clang::Expr*>&, clang::MultiLevelTemplateArgumentList const&, clang::SourceRange, clang::ConstraintSatisfaction&) SemaConcept.cpp:0:0
#10 0x000000000654e59e clang::Sema::CheckConstraintSatisfaction(clang::NamedDecl const*, llvm::ArrayRef<clang::AssociatedConstraint>, llvm::SmallVectorImpl<clang::Expr*>&, clang::MultiLevelTemplateArgumentList const&, clang::SourceRange, clang::ConstraintSatisfaction&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x654e59e)
#11 0x0000000006e3cbbb clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformRequiresExpr(clang::RequiresExpr*) SemaTemplateInstantiate.cpp:0:0
#12 0x0000000006e0b50e clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#13 0x0000000006e0d0d5 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformInitializer(clang::Expr*, bool) SemaTemplateInstantiate.cpp:0:0
#14 0x0000000006e0d2c7 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformReturnStmt(clang::ReturnStmt*) SemaTemplateInstantiate.cpp:0:0
#15 0x0000000006e46255 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformCompoundStmt(clang::CompoundStmt*, bool) SemaTemplateInstantiate.cpp:0:0
#16 0x0000000006e0a846 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformLambdaExpr(clang::LambdaExpr*) SemaTemplateInstantiate.cpp:0:0
#17 0x0000000006e0b9b8 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#18 0x0000000006e32d85 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformCXXDependentScopeMemberExpr(clang::CXXDependentScopeMemberExpr*) SemaTemplateInstantiate.cpp:0:0
#19 0x0000000006e0af8f clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#20 0x0000000006e14e84 clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformCallExpr(clang::CallExpr*) SemaTemplateInstantiate.cpp:0:0
#21 0x0000000006e0b05a clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformExpr(clang::Expr*) SemaTemplateInstantiate.cpp:0:0
#22 0x0000000006e173c5 clang::Sema::SubstConstraintExpr(clang::Expr*, clang::MultiLevelTemplateArgumentList const&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x6e173c5)
#23 0x000000000654be66 calculateConstraintSatisfaction(clang::Sema&, clang::Expr const*, clang::NamedDecl const*, clang::SourceLocation, clang::MultiLevelTemplateArgumentList const&, clang::ConstraintSatisfaction&) SemaConcept.cpp:0:0
#24 0x000000000654de99 CheckConstraintSatisfaction(clang::Sema&, clang::NamedDecl const*, llvm::ArrayRef<clang::AssociatedConstraint>, llvm::SmallVectorImpl<clang::Expr*>&, clang::MultiLevelTemplateArgumentList const&, clang::SourceRange, clang::ConstraintSatisfaction&) SemaConcept.cpp:0:0
#25 0x000000000654e3c7 clang::Sema::CheckConstraintSatisfaction(clang::NamedDecl const*, llvm::ArrayRef<clang::AssociatedConstraint>, llvm::SmallVectorImpl<clang::Expr*>&, clang::MultiLevelTemplateArgumentList const&, clang::SourceRange, clang::ConstraintSatisfaction&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x654e3c7)
#26 0x0000000006ccf7d0 clang::Sema::CheckConceptTemplateId(clang::CXXScopeSpec const&, clang::SourceLocation, clang::DeclarationNameInfo const&, clang::NamedDecl*, clang::ConceptDecl*, clang::TemplateArgumentListInfo const*) (.constprop.0) SemaTemplate.cpp:0:0
#27 0x0000000006ce22a6 clang::Sema::BuildTemplateIdExpr(clang::CXXScopeSpec const&, clang::SourceLocation, clang::LookupResult&, bool, clang::TemplateArgumentListInfo const*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x6ce22a6)
#28 0x0000000006799d55 clang::Sema::ActOnIdExpression(clang::Scope*, clang::CXXScopeSpec&, clang::SourceLocation, clang::UnqualifiedId&, bool, bool, clang::CorrectionCandidateCallback*, bool, clang::Token*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x6799d55)

CC @cor3ntin

[llvmbot]

@llvm/issue-subscribers-clangd

Author: None (yaoxinliu)

``` #include <concepts>

template<typename T>
concept IsOK = []<typename U> consteval -> bool {
return requires { requires std::same_as<typename U::InnerType, void>; };
}.template operator()<T>();

static_assert(!IsOK<int>);

int main() {}

**The above code is simple and legal. However, clangd will crash when parsing it.**

clangd version:

> Ubuntu clangd version 20.1.5 (++20250510053315+4370072022e5-1~exp1~20250510173335.114)
> Features: linux+grpc
> Platform: x86_64-pc-linux-gnu

Attached is the debug info:

I[07:57:39.277] <-- textDocument/semanticTokens/full(3)
V[07:57:39.282] Build dynamic index for header symbols with estimated memory usage of 1275412 bytes
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0. /data/repo/cmn/main.cpp:28:25: current parser token ')'
V[07:57:39.340] <<< {
"id": 4,
"jsonrpc": "2.0",
"method": "textDocument/foldingRange",
"params": {
"textDocument": {
"uri": "file:///data/repo/cmn/main.cpp"
}
}
}

I[07:57:39.340] <-- textDocument/foldingRange(4)
I[07:57:39.341] --> reply:textDocument/foldingRange(4) 0 ms
V[07:57:39.341] >>> {
"id": 4,
"jsonrpc": "2.0",
"result": [
{
"endLine": 24,
"kind": "region",
"startCharacter": 49,
"startLine": 23
},
{
"endLine": 30,
"kind": "region",
"startCharacter": 12,
"startLine": 29
},
{
"endCharacter": 20,
"endLine": 4,
"kind": "comment",
"startCharacter": 2,
"startLine": 2
},
{
"endCharacter": 4,
"endLine": 10,
"kind": "comment",
"startCharacter": 2,
"startLine": 8
},
{
"endCharacter": 4,
"endLine": 14,
"kind": "comment",
"startCharacter": 2,
"startLine": 12
},
{
"endCharacter": 4,
"endLine": 18,
"kind": "comment",
"startCharacter": 2,
"startLine": 16
}
]
}

I[07:57:42.200] Indexed c++23 standard library: 14259 symbols, 1797 filtered
V[07:57:42.241] Build dynamic index for header symbols with estimated memory usage of 10554604 bytes
#0 0x00007feb8fd6d37f llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/usr/lib/llvm-20/bin/../lib/libLLVM.so.20.1+0x103337f)
#1 0x00007feb8fd6b089 llvm::sys::RunSignalHandlers() (/usr/lib/llvm-20/bin/../lib/libLLVM.so.20.1+0x1031089)
#2 0x00007feb8fd6da90 (/usr/lib/llvm-20/bin/../lib/libLLVM.so.20.1+0x1033a90)
#3 0x00007feb8de8e330 (/lib/x86_64-linux-gnu/libc.so.6+0x45330)
#4 0x00007feb987ffafd (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1133afd)
#5 0x00007feb987a8e33 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x10dce33)
#6 0x00007feb987a4ad3 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x10d8ad3)
#7 0x00007feb987a454b clang::Expr::EvaluateAsConstantExpr(clang::Expr::EvalResult&, clang::ASTContext const&, clang::Expr::ConstantExprKind) const (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x10d854b)
#8 0x00007feb98ec67d6 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x17fa7d6)
#9 0x00007feb98ebf8b5 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x17f38b5)
#10 0x00007feb994b0322 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1de4322)
#11 0x00007feb994a326b (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1dd726b)
#12 0x00007feb994c0378 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1df4378)
#13 0x00007feb994ae414 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1de2414)
#14 0x00007feb994b3d09 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1de7d09)
#15 0x00007feb994a6a24 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1ddaa24)
#16 0x00007feb994ab58b (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1ddf58b)
#17 0x00007feb994a8ae4 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1ddcae4)
#18 0x00007feb99472f47 clang::Sema::SubstConstraintExpr(clang::Expr*, clang::MultiLevelTemplateArgumentList const&) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1da6f47)
#19 0x00007feb98ec786d (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x17fb86d)
#20 0x00007feb98ec6743 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x17fa743)
#21 0x00007feb98ebf8b5 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x17f38b5)
#22 0x00007feb98ebf60e clang::Sema::CheckConstraintSatisfaction(clang::NamedDecl const*, llvm::ArrayRef<clang::Expr const*>, llvm::SmallVectorImpl<clang::Expr*>&, clang::MultiLevelTemplateArgumentList const&, clang::SourceRange, clang::ConstraintSatisfaction&) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x17f360e)
#23 0x00007feb99383589 clang::Sema::CheckConceptTemplateId(clang::CXXScopeSpec const&, clang::SourceLocation, clang::DeclarationNameInfo const&, clang::NamedDecl*, clang::ConceptDecl*, clang::TemplateArgumentListInfo const*) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1cb7589)
#24 0x00007feb99383a34 clang::Sema::BuildTemplateIdExpr(clang::CXXScopeSpec const&, clang::SourceLocation, clang::LookupResult&, bool, clang::TemplateArgumentListInfo const*) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1cb7a34)
#25 0x00007feb98fffc62 clang::Sema::ActOnIdExpression(clang::Scope*, clang::CXXScopeSpec&, clang::SourceLocation, clang::UnqualifiedId&, bool, bool, clang::CorrectionCandidateCallback*, bool, clang::Token*) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1933c62)
#26 0x00007feb98491547 clang::Parser::tryParseCXXIdExpression(clang::CXXScopeSpec&, bool, clang::Token&) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xdc5547)
#27 0x00007feb9849275d clang::Parser::ParseCXXIdExpression(bool) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xdc675d)
#28 0x00007feb98482b32 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xdb6b32)
#29 0x00007feb98482bdc clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xdb6bdc)
#30 0x00007feb9848131b clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xdb531b)
#31 0x00007feb984805ec clang::Parser::ParseConstantExpressionInExprEvalContext(clang::Parser::TypeCastState) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xdb45ec)
#32 0x00007feb9846be8b clang::Parser::ParseStaticAssertDeclaration(clang::SourceLocation&) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xd9fe8b)
#33 0x00007feb9844dc91 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xd81c91)
#34 0x00007feb984f535e clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xe2935e)
#35 0x00007feb984f4318 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xe28318)
#36 0x00007feb9843a76e clang::ParseAST(clang::Sema&, bool, bool) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xd6e76e)
#37 0x00007feb9a39cc42 clang::FrontendAction::Execute() (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x2cd0c42)
#38 0x000055f9a3bf6fd3 (/usr/lib/llvm-20/bin/clangd+0x3f9fd3)
#39 0x000055f9a3c9a818 (/usr/lib/llvm-20/bin/clangd+0x49d818)
#40 0x000055f9a3c9a260 (/usr/lib/llvm-20/bin/clangd+0x49d260)
#41 0x000055f9a3c96aee (/usr/lib/llvm-20/bin/clangd+0x499aee)
#42 0x000055f9a3c9668b (/usr/lib/llvm-20/bin/clangd+0x49968b)
#43 0x000055f9a3e014e1 (/usr/lib/llvm-20/bin/clangd+0x6044e1)
#44 0x00007feb8dee5aa4 start_thread ./nptl/pthread_create.c:447:8
#45 0x00007feb8df72c3c clone3 ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:80:0
Signalled during AST worker action: Build AST
Filename: main.cpp
Directory: /data/repo/cmn
Command Line: /usr/lib/llvm-20/bin/clang -std=c++2c -stdlib=libc++ -isystem/usr/include/c++/v1 -g -pipe -m64 -mavx2 -pthread -D_FILE_OFFSET_BITS=64 -D_TIME_BITS=64 -DIS_DEBUGGING=true -Wall -Wextra -Werror -Wconversion -Wold-style-cast -Woverloaded-virtual -Wpointer-arith -Wshadow -Wwrite-strings -Wformat -isystem/usr/include/c++/v1 -isystem/usr/include/x86_64-linux-gnu -isystem/usr/include -isystem. -resource-dir=/usr/lib/llvm-20/lib/clang/20 -- /data/repo/cmn/main.cpp
Version: 1
[Info - 7:57:44 AM] Connection to server got closed. Server will restart.
[Error - 7:57:44 AM] Request textDocument/documentSymbol failed.
[object Object]
[Error - 7:57:44 AM] Request textDocument/codeAction failed.
[object Object]
[Error - 7:57:44 AM] Request textDocument/semanticTokens/full failed.
[object Object]
I[07:57:44.484] Ubuntu clangd version 20.1.5 (++20250510053315+4370072022e5-1exp120250510173335.114)
I[07:57:44.484] Features: linux+grpc
I[07:57:44.484] PID: 3409294
I[07:57:44.484] Working directory: /data/repo/cmn
I[07:57:44.484] argv[0]: /usr/lib/llvm-20/bin/clangd
I[07:57:44.484] argv[1]: --log=verbose
I[07:57:44.484] argv[2]: --pretty
I[07:57:44.484] argv[3]: --background-index
I[07:57:44.484] argv[4]: --header-insertion=iwyu
I[07:57:44.484] argv[5]: --pch-storage=memory
I[07:57:44.484] argv[6]: --enable-config
I[07:57:44.484] argv[7]: --limit-results=5000
I[07:57:44.484] argv[8]: --query-driver=clang++
I[07:57:44.484] argv[9]: --clang-tidy
I[07:57:44.484] argv[10]: --completion-style=detailed
I[07:57:44.484] argv[11]: -j=12
I[07:57:44.484] argv[12]: --all-scopes-completion
V[07:57:44.484] User config file is /home/liuyaoxin/.config/clangd/config.yaml
I[07:57:44.485] Starting LSP over stdin/stdout
V[07:57:44.485] <<< {
"id": 0,
"jsonrpc": "2.0",
"method": "initialize",
"params": {
"capabilities": {
"general": {
"markdown": {
"parser": "marked",
"version": "1.1.0"
},
"positionEncodings": [
"utf-16"
],
"regularExpressions": {
"engine": "ECMAScript",
"version": "ES2020"
},
"staleRequestSupport": {
"cancel": true,
"retryOnContentModified": [
"textDocument/semanticTokens/full",
"textDocument/semanticTokens/range",
"textDocument/semanticTokens/full/delta"
]
}
},
"notebookDocument": {
"synchronization": {
"dynamicRegistration": true,
"executionSummarySupport": true
}
},
"textDocument": {
"callHierarchy": {
"dynamicRegistration": true
},
"codeAction": {
"codeActionLiteralSupport": {
"codeActionKind": {
"valueSet": [
"",
"quickfix",
"refactor",
"refactor.extract",
"refactor.inline",
"refactor.rewrite",
"source",
"source.organizeImports"
]
}
},
"dataSupport": true,
"disabledSupport": true,
"dynamicRegistration": true,
"honorsChangeAnnotations": false,
"isPreferredSupport": true,
"resolveSupport": {
"properties": [
"edit"
]
}
},
"codeLens": {
"dynamicRegistration": true
},
"colorProvider": {
"dynamicRegistration": true
},
"completion": {
"completionItem": {
"commitCharactersSupport": true,
"deprecatedSupport": true,
"documentationFormat": [
"markdown",
"plaintext"
],
"insertReplaceSupport": true,
"insertTextModeSupport": {
"valueSet": [
1,
2
]
},
"labelDetailsSupport": true,
"preselectSupport": true,
"resolveSupport": {
"properties": [
"documentation",
"detail",
"additionalTextEdits"
]
},
"snippetSupport": true,
"tagSupport": {
"valueSet": [
1
]
}
},
"completionItemKind": {
"valueSet": [
1,
2,
3,
4,
5,
6,
7,
8,
9,
10,
11,
12,
13,
14,
15,
16,
17,
18,
19,
20,
21,
22,
23,
24,
25
]
},
"completionList": {
"itemDefaults": [
"commitCharacters",
"editRange",
"insertTextFormat",
"insertTextMode"
]
},
"contextSupport": true,
"dynamicRegistration": true,
"editsNearCursor": true,
"insertTextMode": 2
},
"declaration": {
"dynamicRegistration": true,
"linkSupport": true
},
"definition": {
"dynamicRegistration": true,
"linkSupport": true
},
"diagnostic": {
"dynamicRegistration": true,
"relatedDocumentSupport": false
},
"documentHighlight": {
"dynamicRegistration": true
},
"documentLink": {
"dynamicRegistration": true,
"tooltipSupport": true
},
"documentSymbol": {
"dynamicRegistration": true,
"hierarchicalDocumentSymbolSupport": true,
"labelSupport": true,
"symbolKind": {
"valueSet": [
1,
2,
3,
4,
5,
6,
7,
8,
9,
10,
11,
12,
13,
14,
15,
16,
17,
18,
19,
20,
21,
22,
23,
24,
25,
26
]
},
"tagSupport": {
"valueSet": [
1
]
}
},
"foldingRange": {
"dynamicRegistration": true,
"foldingRange": {
"collapsedText": false
},
"foldingRangeKind": {
"valueSet": [
"comment",
"imports",
"region"
]
},
"lineFoldingOnly": true,
"rangeLimit": 5000
},
"formatting": {
"dynamicRegistration": true
},
"hover": {
"contentFormat": [
"markdown",
"plaintext"
],
"dynamicRegistration": true
},
"implementation": {
"dynamicRegistration": true,
"linkSupport": true
},
"inactiveRegionsCapabilities": {
"inactiveRegions": true
},
"inlayHint": {
"dynamicRegistration": true,
"resolveSupport": {
"properties": [
"tooltip",
"textEdits",
"label.tooltip",
"label.location",
"label.command"
]
}
},
"inlineValue": {
"dynamicRegistration": true
},
"linkedEditingRange": {
"dynamicRegistration": true
},
"onTypeFormatting": {
"dynamicRegistration": true
},
"publishDiagnostics": {
"codeDescriptionSupport": true,
"dataSupport": true,
"relatedInformation": true,
"tagSupport": {
"valueSet": [
1,
2
]
},
"versionSupport": false
},
"rangeFormatting": {
"dynamicRegistration": true
},
"references": {
"dynamicRegistration": true
},
"rename": {
"dynamicRegistration": true,
"honorsChangeAnnotations": true,
"prepareSupport": true,
"prepareSupportDefaultBehavior": 1
},
"selectionRange": {
"dynamicRegistration": true
},
"semanticTokens": {
"augmentsSyntaxTokens": true,
"dynamicRegistration": true,
"formats": [
"relative"
],
"multilineTokenSupport": false,
"overlappingTokenSupport": false,
"requests": {
"full": {
"delta": true
},
"range": true
},
"serverCancelSupport": true,
"tokenModifiers": [
"declaration",
"definition",
"readonly",
"static",
"deprecated",
"abstract",
"async",
"modification",
"documentation",
"defaultLibrary"
],
"tokenTypes": [
"namespace",
"type",
"class",
"enum",
"interface",
"struct",
"typeParameter",
"parameter",
"variable",
"property",
"enumMember",
"event",
"function",
"method",
"macro",
"keyword",
"modifier",
"comment",
"string",
"number",
"regexp",
"operator",
"decorator"
]
},
"signatureHelp": {
"contextSupport": true,
"dynamicRegistration": true,
"signatureInformation": {
"activeParameterSupport": true,
"documentationFormat": [
"markdown",
"plaintext"
],
"parameterInformation": {
"labelOffsetSupport": true
}
}
},
"synchronization": {
"didSave": true,
"dynamicRegistration": true,
"willSave": true,
"willSaveWaitUntil": true
},
"typeDefinition": {
"dynamicRegistration": true,
"linkSupport": true
},
"typeHierarchy": {
"dynamicRegistration": true
}
},
"window": {
"showDocument": {
"support": true
},
"showMessage": {
"messageActionItem": {
"additionalPropertiesSupport": true
}
},
"workDoneProgress": true
},
"workspace": {
"applyEdit": true,
"codeLens": {
"refreshSupport": true
},
"configuration": true,
"diagnostics": {
"refreshSupport": true
},
"didChangeConfiguration": {
"dynamicRegistration": true
},
"didChangeWatchedFiles": {
"dynamicRegistration": true,
"relativePatternSupport": true
},
"executeCommand": {
"dynamicRegistration": true
},
"fileOperations": {
"didCreate": true,
"didDelete": true,
"didRename": true,
"dynamicRegistration": true,
"willCreate": true,
"willDelete": true,
"willRename": true
},
"inlayHint": {
"refreshSupport": true
},
"inlineValue": {
"refreshSupport": true
},
"semanticTokens": {
"refreshSupport": true
},
"symbol": {
"dynamicRegistration": true,
"resolveSupport": {
"properties": [
"location.range"
]
},
"symbolKind": {
"valueSet": [
1,
2,
3,
4,
5,
6,
7,
8,
9,
10,
11,
12,
13,
14,
15,
16,
17,
18,
19,
20,
21,
22,
23,
24,
25,
26
]
},
"tagSupport": {
"valueSet": [
1
]
}
},
"workspaceEdit": {
"changeAnnotationSupport": {
"groupsOnLabel": true
},
"documentChanges": true,
"failureHandling": "textOnlyTransactional",
"normalizesLineEndings": true,
"resourceOperations": [
"create",
"rename",
"delete"
]
},
"workspaceFolders": true
}
},
"clientInfo": {
"name": "Visual Studio Code",
"version": "1.100.2"
},
"initializationOptions": {
"clangdFileStatus": true,
"fallbackFlags": []
},
"locale": "en",
"processId": 3409019,
"rootPath": "/data/repo/cmn",
"rootUri": "file:///data/repo/cmn",
"trace": "off",
"workspaceFolders": [
{
"name": "cmn",
"uri": "file:///data/repo/cmn"
}
]
}
}

I[07:57:44.485] <-- initialize(0)
I[07:57:44.516] --> reply:initialize(0) 30 ms
V[07:57:44.516] >>> {
"id": 0,
"jsonrpc": "2.0",
"result": {
"capabilities": {
"astProvider": true,
"callHierarchyProvider": true,
"clangdInlayHintsProvider": true,
"codeActionProvider": {
"codeActionKinds": [
"quickfix",
"refactor",
"info"
]
},
"compilationDatabase": {
"automaticReload": true
},
"completionProvider": {
"resolveProvider": false,
"triggerCharacters": [
".",
"<",
">",
":",
""",
"/",
"*"
]
},
"declarationProvider": true,
"definitionProvider": true,
"documentFormattingProvider": true,
"documentHighlightProvider": true,
"documentLinkProvider": {
"resolveProvider": false
},
"documentOnTypeFormattingProvider": {
"firstTriggerCharacter": "\n",
"moreTriggerCharacter": []
},
"documentRangeFormattingProvider": true,
"documentSymbolProvider": true,
"executeCommandProvider": {
"commands": [
"clangd.applyFix",
"clangd.applyRename",
"clangd.applyTweak"
]
},
"foldingRangeProvider": true,
"hoverProvider": true,
"implementationProvider": true,
"inactiveRegionsProvider": true,
"inlayHintProvider": true,
"memoryUsageProvider": true,
"referencesProvider": true,
"renameProvider": {
"prepareProvider": true
},
"selectionRangeProvider": true,
"semanticTokensProvider": {
"full": {
"delta": true
},
"legend": {
"tokenModifiers": [
"declaration",
"definition",
"deprecated",
"deduced",
"readonly",
"static",
"abstract",
"virtual",
"dependentName",
"defaultLibrary",
"usedAsMutableReference",
"usedAsMutablePointer",
"constructorOrDestructor",
"userDefined",
"functionScope",
"classScope",
"fileScope",
"globalScope"
],
"tokenTypes": [
"variable",
"variable",
"parameter",
"function",
"method",
"function",
"property",
"variable",
"class",
"interface",
"enum",
"enumMember",
"type",
"type",
"unknown",
"namespace",
"typeParameter",
"concept",
"type",
"macro",
"modifier",
"operator",
"bracket",
"label",
"comment"
]
},
"range": false
},
"signatureHelpProvider": {
"triggerCharacters": [
"(",
")",
"{",
"}",
"<",
">",
","
]
},
"standardTypeHierarchyProvider": true,
"textDocumentSync": {
"change": 2,
"openClose": true,
"save": true
},
"typeDefinitionProvider": true,
"typeHierarchyProvider": true,
"workspaceSymbolProvider": true
},
"serverInfo": {
"name": "clangd",
"version": "Ubuntu clangd version 20.1.5 (++20250510053315+4370072022e5-1exp120250510173335.114) linux+grpc x86_64-pc-linux-gnu"
}
}
}

V[07:57:44.518] <<< {
"jsonrpc": "2.0",
"method": "initialized",
"params": {}
}

I[07:57:44.518] <-- initialized
V[07:57:44.521] <<< {
"jsonrpc": "2.0",
"method": "textDocument/didOpen",
"params": {
"textDocument": {
"languageId": "cpp",
"text": "// #include <cmn/tester.hpp>\n\n// #include <chrono>\n// #include <stdexcept>\n// #include <thread>\n\n// #include <cmn/test/test_all.hpp>\n\n// TEST_CASE (test1) {\n// std::this_thread::sleep_for(2s);\n// }\n\n// TEST_CASE (test2) {\n// std::this_thread::sleep_for(3s);\n// }\n\n// TEST_CASE (test3) {\n// std::this_thread::sleep_for(1s);\n// }\n\n#include <concepts>\n\ntemplate<typename T>\nconcept IsOK = []<typename U> consteval -> bool { \n return requires { requires std::same_as<typename U::InnerType, void>; };\n}.template operator()<T>();\n\nstatic_assert(!IsOK<int>);\n\nint main() {\n // cmn::run_test_cases();\n}\n",
"uri": "file:///data/repo/cmn/main.cpp",
"version": 1
}
}
}

I[07:57:44.521] <-- textDocument/didOpen
V[07:57:44.552] System include extraction: driver clang expanded to /usr/lib/llvm-20/bin/clang
V[07:57:44.552] System include extraction: not allowed driver /usr/lib/llvm-20/bin/clang
V[07:57:44.552] <<< {
"id": 1,
"jsonrpc": "2.0",
"method": "textDocument/documentSymbol",
"params": {
"textDocument": {
"uri": "file:///data/repo/cmn/main.cpp"
}
}
}

I[07:57:44.552] <-- textDocument/documentSymbol(1)
V[07:57:44.552] <<< {
"id": 2,
"jsonrpc": "2.0",
"method": "textDocument/codeAction",
"params": {
"context": {
"diagnostics": [],
"triggerKind": 2
},
"range": {
"end": {
"character": 49,
"line": 23
},
"start": {
"character": 49,
"line": 23
}
},
"textDocument": {
"uri": "file:///data/repo/cmn/main.cpp"
}
}
}

I[07:57:44.552] <-- textDocument/codeAction(2)
V[07:57:44.553] config note at /data/repo/cmn/.clangd:4:0: Parsing config fragment
V[07:57:44.553] config note at /data/repo/cmn/.clangd:1:0: Parsed 1 fragments from file
V[07:57:44.553] Config fragment: compiling /data/repo/cmn/.clangd:4 -> 0x00007F3790002C60 (trusted=false)
I[07:57:44.553] config warning at :-1:-1: Invalid MissingIncludes value 'true'. Valid values are Strict, None.
I[07:57:44.553] --> textDocument/publishDiagnostics
V[07:57:44.553] >>> {
"jsonrpc": "2.0",
"method": "textDocument/publishDiagnostics",
"params": {
"diagnostics": [],
"uri": "file:///data/repo/cmn/.clangd"
}
}

I[07:57:44.554] Failed to find compilation database for /data/repo/cmn/main.cpp
V[07:57:44.580] System include extraction: driver clang expanded to /usr/lib/llvm-20/bin/clang
V[07:57:44.580] System include extraction: not allowed driver /usr/lib/llvm-20/bin/clang
I[07:57:44.580] ASTWorker building file /data/repo/cmn/main.cpp version 1 with command clangd fallback
[/data/repo/cmn]
/usr/lib/llvm-20/bin/clang -std=c++2c -stdlib=libc++ -isystem/usr/include/c++/v1 -g -pipe -m64 -mavx2 -pthread -D_FILE_OFFSET_BITS=64 -D_TIME_BITS=64 -DIS_DEBUGGING=true -Wall -Wextra -Werror -Wconversion -Wold-style-cast -Woverloaded-virtual -Wpointer-arith -Wshadow -Wwrite-strings -Wformat -isystem/usr/include/c++/v1 -isystem/usr/include/x86_64-linux-gnu -isystem/usr/include -isystem. -resource-dir=/usr/lib/llvm-20/lib/clang/20 -- /data/repo/cmn/main.cpp
V[07:57:44.581] Driver produced command: cc1 -cc1 -triple x86_64-pc-linux-gnu -fsyntax-only -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name main.cpp -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -target-feature +avx2 -tune-cpu generic -debug-info-kind=constructor -dwarf-version=5 -debugger-tuning=gdb -fdebug-compilation-dir=/data/repo/cmn -fcoverage-compilation-dir=/data/repo/cmn -resource-dir /usr/lib/llvm-20/lib/clang/20 -isystem /usr/include/c++/v1 -isystem /usr/include/c++/v1 -isystem /usr/include/x86_64-linux-gnu -isystem /usr/include -isystem . -D _FILE_OFFSET_BITS=64 -D _TIME_BITS=64 -D IS_DEBUGGING=true -internal-isystem /usr/lib/llvm-20/bin/../include/c++/v1 -internal-isystem /usr/lib/llvm-20/lib/clang/20/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/13/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -Wall -Wextra -Werror -Wconversion -Wold-style-cast -Woverloaded-virtual -Wpointer-arith -Wshadow -Wwrite-strings -Wformat -std=c++2c -fdeprecated-macro -ferror-limit 19 -pthread -fgnuc-version=4.2.1 -fno-implicit-modules -fskip-odr-check-in-gmf -fcxx-exceptions -fexceptions -no-round-trip-args -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -x c++ /data/repo/cmn/main.cpp
I[07:57:44.581] --> textDocument/clangd.fileStatus
V[07:57:44.581] >>> {
"jsonrpc": "2.0",
"method": "textDocument/clangd.fileStatus",
"params": {
"state": "parsing includes, running Update",
"uri": "file:///data/repo/cmn/main.cpp"
}
}

V[07:57:44.581] Building first preamble for /data/repo/cmn/main.cpp version 1
I[07:57:44.630] Built preamble of size 636760 for file /data/repo/cmn/main.cpp version 1 in 0.05 seconds
I[07:57:44.631] --> workspace/semanticTokens/refresh(0)
I[07:57:44.631] Indexing c++23 standard library in the context of /data/repo/cmn/main.cpp
V[07:57:44.631] >>> {
"id": 0,
"jsonrpc": "2.0",
"method": "workspace/semanticTokens/refresh",
"params": null
}

I[07:57:44.631] --> textDocument/clangd.fileStatus
V[07:57:44.631] >>> {
"jsonrpc": "2.0",
"method": "textDocument/clangd.fileStatus",
"params": {
"state": "parsing includes, running Build AST",
"uri": "file:///data/repo/cmn/main.cpp"
}
}

V[07:57:44.631] <<< {
"id": 0,
"jsonrpc": "2.0",
"result": null
}

I[07:57:44.631] <-- reply(0)
V[07:57:44.636] <<< {
"id": 3,
"jsonrpc": "2.0",
"method": "textDocument/semanticTokens/full",
"params": {
"textDocument": {
"uri": "file:///data/repo/cmn/main.cpp"
}
}
}

I[07:57:44.636] <-- textDocument/semanticTokens/full(3)
V[07:57:44.639] Ignored diagnostic. invalid configuration value 'lower_space' for option 'readability-identifier-naming.NamespaceCase' [clang-tidy-config]
V[07:57:44.641] indexed preamble AST for /data/repo/cmn/main.cpp version 1:
symbol slab: 739 symbols, 204336 bytes
ref slab: 0 symbols, 0 refs, 128 bytes
relations slab: 58 relations, 1112 bytes
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0. /data/repo/cmn/main.cpp:28:25: current parser token ')'
V[07:57:44.647] Build dynamic index for header symbols with estimated memory usage of 1275412 bytes
V[07:57:44.725] <<< {
"id": 4,
"jsonrpc": "2.0",
"method": "textDocument/foldingRange",
"params": {
"textDocument": {
"uri": "file:///data/repo/cmn/main.cpp"
}
}
}

I[07:57:44.725] <-- textDocument/foldingRange(4)
I[07:57:44.725] --> reply:textDocument/foldingRange(4) 0 ms
V[07:57:44.725] >>> {
"id": 4,
"jsonrpc": "2.0",
"result": [
{
"endLine": 24,
"kind": "region",
"startCharacter": 49,
"startLine": 23
},
{
"endLine": 30,
"kind": "region",
"startCharacter": 12,
"startLine": 29
},
{
"endCharacter": 20,
"endLine": 4,
"kind": "comment",
"startCharacter": 2,
"startLine": 2
},
{
"endCharacter": 4,
"endLine": 10,
"kind": "comment",
"startCharacter": 2,
"startLine": 8
},
{
"endCharacter": 4,
"endLine": 14,
"kind": "comment",
"startCharacter": 2,
"startLine": 12
},
{
"endCharacter": 4,
"endLine": 18,
"kind": "comment",
"startCharacter": 2,
"startLine": 16
}
]
}

I[07:57:47.622] Indexed c++23 standard library: 14259 symbols, 1797 filtered
V[07:57:47.664] Build dynamic index for header symbols with estimated memory usage of 10554860 bytes
#0 0x00007f37ce32137f llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/usr/lib/llvm-20/bin/../lib/libLLVM.so.20.1+0x103337f)
#1 0x00007f37ce31f089 llvm::sys::RunSignalHandlers() (/usr/lib/llvm-20/bin/../lib/libLLVM.so.20.1+0x1031089)
#2 0x00007f37ce321a90 (/usr/lib/llvm-20/bin/../lib/libLLVM.so.20.1+0x1033a90)
#3 0x00007f37cc442330 (/lib/x86_64-linux-gnu/libc.so.6+0x45330)
#4 0x00007f37d6db3afd (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1133afd)
#5 0x00007f37d6d5ce33 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x10dce33)
#6 0x00007f37d6d58ad3 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x10d8ad3)
#7 0x00007f37d6d5854b clang::Expr::EvaluateAsConstantExpr(clang::Expr::EvalResult&, clang::ASTContext const&, clang::Expr::ConstantExprKind) const (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x10d854b)
#8 0x00007f37d747a7d6 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x17fa7d6)
#9 0x00007f37d74738b5 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x17f38b5)
#10 0x00007f37d7a64322 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1de4322)
#11 0x00007f37d7a5726b (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1dd726b)
#12 0x00007f37d7a74378 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1df4378)
#13 0x00007f37d7a62414 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1de2414)
#14 0x00007f37d7a67d09 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1de7d09)
#15 0x00007f37d7a5aa24 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1ddaa24)
#16 0x00007f37d7a5f58b (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1ddf58b)
#17 0x00007f37d7a5cae4 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1ddcae4)
#18 0x00007f37d7a26f47 clang::Sema::SubstConstraintExpr(clang::Expr*, clang::MultiLevelTemplateArgumentList const&) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1da6f47)
#19 0x00007f37d747b86d (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x17fb86d)
#20 0x00007f37d747a743 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x17fa743)
#21 0x00007f37d74738b5 (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x17f38b5)
#22 0x00007f37d747360e clang::Sema::CheckConstraintSatisfaction(clang::NamedDecl const*, llvm::ArrayRef<clang::Expr const*>, llvm::SmallVectorImpl<clang::Expr*>&, clang::MultiLevelTemplateArgumentList const&, clang::SourceRange, clang::ConstraintSatisfaction&) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x17f360e)
#23 0x00007f37d7937589 clang::Sema::CheckConceptTemplateId(clang::CXXScopeSpec const&, clang::SourceLocation, clang::DeclarationNameInfo const&, clang::NamedDecl*, clang::ConceptDecl*, clang::TemplateArgumentListInfo const*) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1cb7589)
#24 0x00007f37d7937a34 clang::Sema::BuildTemplateIdExpr(clang::CXXScopeSpec const&, clang::SourceLocation, clang::LookupResult&, bool, clang::TemplateArgumentListInfo const*) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1cb7a34)
#25 0x00007f37d75b3c62 clang::Sema::ActOnIdExpression(clang::Scope*, clang::CXXScopeSpec&, clang::SourceLocation, clang::UnqualifiedId&, bool, bool, clang::CorrectionCandidateCallback*, bool, clang::Token*) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x1933c62)
#26 0x00007f37d6a45547 clang::Parser::tryParseCXXIdExpression(clang::CXXScopeSpec&, bool, clang::Token&) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xdc5547)
#27 0x00007f37d6a4675d clang::Parser::ParseCXXIdExpression(bool) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xdc675d)
#28 0x00007f37d6a36b32 clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xdb6b32)
#29 0x00007f37d6a36bdc clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xdb6bdc)
#30 0x00007f37d6a3531b clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xdb531b)
#31 0x00007f37d6a345ec clang::Parser::ParseConstantExpressionInExprEvalContext(clang::Parser::TypeCastState) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xdb45ec)
#32 0x00007f37d6a1fe8b clang::Parser::ParseStaticAssertDeclaration(clang::SourceLocation&) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xd9fe8b)
#33 0x00007f37d6a01c91 clang::Parser::ParseDeclaration(clang::DeclaratorContext, clang::SourceLocation&, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::SourceLocation*) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xd81c91)
#34 0x00007f37d6aa935e clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xe2935e)
#35 0x00007f37d6aa8318 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xe28318)
#36 0x00007f37d69ee76e clang::ParseAST(clang::Sema&, bool, bool) (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0xd6e76e)
#37 0x00007f37d8950c42 clang::FrontendAction::Execute() (/usr/lib/llvm-20/bin/../lib/libclang-cpp.so.20.1+0x2cd0c42)
#38 0x0000563bd4ecefd3 (/usr/lib/llvm-20/bin/clangd+0x3f9fd3)
#39 0x0000563bd4f72818 (/usr/lib/llvm-20/bin/clangd+0x49d818)
#40 0x0000563bd4f72260 (/usr/lib/llvm-20/bin/clangd+0x49d260)
#41 0x0000563bd4f6eaee (/usr/lib/llvm-20/bin/clangd+0x499aee)
#42 0x0000563bd4f6e68b (/usr/lib/llvm-20/bin/clangd+0x49968b)
#43 0x0000563bd50d94e1 (/usr/lib/llvm-20/bin/clangd+0x6044e1)
#44 0x00007f37cc499aa4 start_thread ./nptl/pthread_create.c:447:8
#45 0x00007f37cc526c3c clone3 ./misc/../sysdeps/unix/sysv/linux/x86_64/clone3.S:80:0
Signalled during AST worker action: Build AST
Filename: main.cpp
Directory: /data/repo/cmn
Command Line: /usr/lib/llvm-20/bin/clang -std=c++2c -stdlib=libc++ -isystem/usr/include/c++/v1 -g -pipe -m64 -mavx2 -pthread -D_FILE_OFFSET_BITS=64 -D_TIME_BITS=64 -DIS_DEBUGGING=true -Wall -Wextra -Werror -Wconversion -Wold-style-cast -Woverloaded-virtual -Wpointer-arith -Wshadow -Wwrite-strings -Wformat -isystem/usr/include/c++/v1 -isystem/usr/include/x86_64-linux-gnu -isystem/usr/include -isystem. -resource-dir=/usr/lib/llvm-20/lib/clang/20 -- /data/repo/cmn/main.cpp
Version: 1
[Error - 7:57:49 AM] 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.
[Error - 7:57:49 AM] Request textDocument/documentSymbol failed.
[object Object]
[Error - 7:57:49 AM] Request textDocument/codeAction failed.
[object Object]
[Error - 7:57:49 AM] Request textDocument/semanticTokens/full failed.
[object Object]

</details>

[kadircet]

oops, nvm missed #141693 (comment).