[clang] Assertion failure when prefix increment is deleted and postfix increment is overloaded

[Fznamznon]

Simple example:

class b {
  void operator++() = delete;
  template <class> void operator++(int) {
    b bb;
    ++bb;
  }
};

Output:

<source>:11:5: error: overload resolution selected deleted operator '++'
   11 |     ++bb;
      |     ^ ~~
<source>:8:8: note: candidate function has been explicitly deleted
    8 |   void operator++() = delete;
      |        ^
clang++: /root/llvm-project/clang/lib/Sema/SemaOverload.cpp:11346: bool CheckArityMismatch(clang::Sema&, clang::OverloadCandidate*, unsigned int): Assertion `(Cand->FailureKind == ovl_fail_too_many_arguments) || (Cand->FailureKind == ovl_fail_bad_deduction && Cand->DeductionFailure.Result == Sema::TDK_TooManyArguments)' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.	Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/clang++ -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics <source>
1.	<source>:11:9: current parser token ';'
2.	<source>:7:1: parsing struct/union/class body 'b'
3.	<source>:9:41: parsing function body 'b::operator++'
4.	<source>:9:41: in compound statement ('{}')
 #0 0x00000000037fbef8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x37fbef8)
 #1 0x00000000037f9bdc llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x37f9bdc)
 #2 0x00000000037426b8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007fee89242520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007fee892969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x00007fee89242476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x00007fee892287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x00007fee8922871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x00007fee89239e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x00000000068e2d1e CheckArityMismatch(clang::Sema&, clang::OverloadCandidate*, unsigned int) (.isra.0) SemaOverload.cpp:0:0
#10 0x0000000006925079 clang::OverloadCandidateSet::NoteCandidates(clang::Sema&, llvm::ArrayRef<clang::Expr*>, llvm::ArrayRef<clang::OverloadCandidate*>, llvm::StringRef, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6925079)
#11 0x0000000006925791 clang::OverloadCandidateSet::NoteCandidates(std::pair<clang::SourceLocation, clang::PartialDiagnostic>, clang::Sema&, clang::OverloadCandidateDisplayKind, llvm::ArrayRef<clang::Expr*>, llvm::StringRef, clang::SourceLocation, llvm::function_ref<bool (clang::OverloadCandidate&)>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6925791)
#12 0x000000000692a876 clang::Sema::CreateOverloadedUnaryOp(clang::SourceLocation, clang::UnaryOperatorKind, clang::UnresolvedSetImpl const&, clang::Expr*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x692a876)
#13 0x00000000065b31ab clang::Sema::BuildUnaryOp(clang::Scope*, clang::SourceLocation, clang::UnaryOperatorKind, clang::Expr*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65b31ab)
#14 0x00000000060786de clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x60786de)
#15 0x000000000607a31a clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x607a31a)
#16 0x000000000607a4b9 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x607a4b9)
#17 0x000000000607f039 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x607f039)
#18 0x00000000060fabe9 clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x60fabe9)
#19 0x00000000060f12a7 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x60f12a7)
#20 0x00000000060f2167 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x60f2167)
#21 0x00000000060f3089 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x60f3089)
#22 0x00000000060f49aa clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x60f49aa)
#23 0x0000000006022d96 clang::Parser::ParseLexedMethodDef(clang::Parser::LexedMethod&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6022d96)
#24 0x0000000006022a9d clang::Parser::ParseLexedMethodDefs(clang::Parser::ParsingClass&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6022a9d)
#25 0x000000000606ec95 clang::Parser::ParseCXXMemberSpecification(clang::SourceLocation, clang::SourceLocation, clang::ParsedAttributes&, unsigned int, clang::Decl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x606ec95)
#26 0x0000000006070cd0 clang::Parser::ParseClassSpecifier(clang::tok::TokenKind, clang::SourceLocation, clang::DeclSpec&, clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6070cd0)
#27 0x0000000006049f08 clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&, clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6049f08)
#28 0x000000000600f144 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x600f144)
#29 0x000000000600fad1 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x600fad1)
#30 0x0000000006016d86 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6016d86)
#31 0x0000000006017c2d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6017c2d)
#32 0x000000000600ac1a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x600ac1a)
#33 0x000000000407f038 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x407f038)
#34 0x00000000042ec069 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x42ec069)
#35 0x000000000426b11e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x426b11e)
#36 0x00000000043cb23e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x43cb23e)
#37 0x0000000000c0d476 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc0d476)
#38 0x0000000000c04cfa ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#39 0x00000000040c0309 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#40 0x0000000003742b64 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3742b64)
#41 0x00000000040c08ff clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (.part.0) Job.cpp:0:0
#42 0x00000000040888d5 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x40888d5)
#43 0x000000000408933d clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x408933d)
#44 0x0000000004091235 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4091235)
#45 0x0000000000c0a86c clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc0a86c)
#46 0x0000000000b02574 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xb02574)
#47 0x00007fee89229d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#48 0x00007fee89229e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#49 0x0000000000c047de _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc047de)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134

In release build note is funny:

<source>:9:25: note: candidate function template not viable: requires 1 argument, but 1 was provided
    9 |   template <class> void operator++(int) {
      |                         ^          ~~~

Demo https://godbolt.org/z/65xGK4ee7

I think I have a fix. The issue is created to provide better context.

[llvmbot]

@llvm/issue-subscribers-clang-frontend

Author: Mariya Podchishchaeva (Fznamznon)

Simple example: ``` class b { void operator++() = delete; template <class> void operator++(int) { b bb; ++bb; } }; ``` Output: ``` <source>:11:5: error: overload resolution selected deleted operator '++' 11 | ++bb; | ^ ~~ <source>:8:8: note: candidate function has been explicitly deleted 8 | void operator++() = delete; | ^ clang++: /root/llvm-project/clang/lib/Sema/SemaOverload.cpp:11346: bool CheckArityMismatch(clang::Sema&, clang::OverloadCandidate*, unsigned int): Assertion `(Cand->FailureKind == ovl_fail_too_many_arguments) || (Cand->FailureKind == ovl_fail_bad_deduction && Cand->DeductionFailure.Result == Sema::TDK_TooManyArguments)' failed. PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script. Stack dump: 0. Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/clang++ -gdwarf-4 -g -o /app/output.s -mllvm --x86-asm-syntax=intel -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics <source> 1. <source>:11:9: current parser token ';' 2. <source>:7:1: parsing struct/union/class body 'b' 3. <source>:9:41: parsing function body 'b::operator++' 4. <source>:9:41: in compound statement ('{}') #0 0x00000000037fbef8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x37fbef8) #1 0x00000000037f9bdc llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x37f9bdc) #2 0x00000000037426b8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0 #3 0x00007fee89242520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520) #4 0x00007fee892969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc) #5 0x00007fee89242476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476) #6 0x00007fee892287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3) #7 0x00007fee8922871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b) #8 0x00007fee89239e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96) #9 0x00000000068e2d1e CheckArityMismatch(clang::Sema&, clang::OverloadCandidate*, unsigned int) (.isra.0) SemaOverload.cpp:0:0 #10 0x0000000006925079 clang::OverloadCandidateSet::NoteCandidates(clang::Sema&, llvm::ArrayRef<clang::Expr*>, llvm::ArrayRef<clang::OverloadCandidate*>, llvm::StringRef, clang::SourceLocation) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6925079) #11 0x0000000006925791 clang::OverloadCandidateSet::NoteCandidates(std::pair<clang::SourceLocation, clang::PartialDiagnostic>, clang::Sema&, clang::OverloadCandidateDisplayKind, llvm::ArrayRef<clang::Expr*>, llvm::StringRef, clang::SourceLocation, llvm::function_ref<bool (clang::OverloadCandidate&)>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6925791) #12 0x000000000692a876 clang::Sema::CreateOverloadedUnaryOp(clang::SourceLocation, clang::UnaryOperatorKind, clang::UnresolvedSetImpl const&, clang::Expr*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x692a876) #13 0x00000000065b31ab clang::Sema::BuildUnaryOp(clang::Scope*, clang::SourceLocation, clang::UnaryOperatorKind, clang::Expr*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x65b31ab) #14 0x00000000060786de clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, bool&, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x60786de) #15 0x000000000607a31a clang::Parser::ParseCastExpression(clang::Parser::CastParseKind, bool, clang::Parser::TypeCastState, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x607a31a) #16 0x000000000607a4b9 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x607a4b9) #17 0x000000000607f039 clang::Parser::ParseExpression(clang::Parser::TypeCastState) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x607f039) #18 0x00000000060fabe9 clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x60fabe9) #19 0x00000000060f12a7 clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x60f12a7) #20 0x00000000060f2167 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*, 32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x60f2167) #21 0x00000000060f3089 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x60f3089) #22 0x00000000060f49aa clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x60f49aa) #23 0x0000000006022d96 clang::Parser::ParseLexedMethodDef(clang::Parser::LexedMethod&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6022d96) #24 0x0000000006022a9d clang::Parser::ParseLexedMethodDefs(clang::Parser::ParsingClass&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6022a9d) #25 0x000000000606ec95 clang::Parser::ParseCXXMemberSpecification(clang::SourceLocation, clang::SourceLocation, clang::ParsedAttributes&, unsigned int, clang::Decl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x606ec95) #26 0x0000000006070cd0 clang::Parser::ParseClassSpecifier(clang::tok::TokenKind, clang::SourceLocation, clang::DeclSpec&, clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier, bool, clang::Parser::DeclSpecContext, clang::ParsedAttributes&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6070cd0) #27 0x0000000006049f08 clang::Parser::ParseDeclarationSpecifiers(clang::DeclSpec&, clang::Parser::ParsedTemplateInfo const&, clang::AccessSpecifier, clang::Parser::DeclSpecContext, clang::Parser::LateParsedAttrList*, clang::ImplicitTypenameContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6049f08) #28 0x000000000600f144 clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x600f144) #29 0x000000000600fad1 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x600fad1) #30 0x0000000006016d86 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6016d86) #31 0x0000000006017c2d clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6017c2d) #32 0x000000000600ac1a clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x600ac1a) #33 0x000000000407f038 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x407f038) #34 0x00000000042ec069 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x42ec069) #35 0x000000000426b11e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x426b11e) #36 0x00000000043cb23e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x43cb23e) #37 0x0000000000c0d476 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc0d476) #38 0x0000000000c04cfa ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0 #39 0x00000000040c0309 void llvm::function_ref<void ()>::callback_fn<clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const::'lambda'()>(long) Job.cpp:0:0 #40 0x0000000003742b64 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3742b64) #41 0x00000000040c08ff clang::driver::CC1Command::Execute(llvm::ArrayRef<std::optional<llvm::StringRef>>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>*, bool*) const (.part.0) Job.cpp:0:0 #42 0x00000000040888d5 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x40888d5) #43 0x000000000408933d clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x408933d) #44 0x0000000004091235 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4091235) #45 0x0000000000c0a86c clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc0a86c) #46 0x0000000000b02574 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xb02574) #47 0x00007fee89229d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90) #48 0x00007fee89229e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40) #49 0x0000000000c047de _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc047de) clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation) Compiler returned: 134 ```

In release build note is funny:

<source>:9:25: note: candidate function template not viable: requires 1 argument, but 1 was provided
    9 |   template <class> void operator++(int) {
      |                         ^          ~~~

Demo https://godbolt.org/z/65xGK4ee7

I think I have a fix. The issue is created to provide better context.

[shafik]

Confirmed