[clang] Assertion `!MayBePseudoDestructor && "unexpected annot_cxxscope"' failed.

Reproducer:
https://godbolt.org/z/YMnhxhPfs
```cpp
void foo() { (auto()->bar::); }
```

Backtrace:
```console
clang++: /root/llvm-project/llvm/tools/clang/lib/Parse/ParseExprCXX.cpp:117: bool clang::Parser::ParseOptionalCXXScopeSpecifier(clang::CXXScopeSpec&, clang::ParsedType, bool, bool, bool*, bool, const clang::IdentifierInfo**, bool, bool, bool, bool, bool): Assertion `!MayBePseudoDestructor && "unexpected annot_cxxscope"' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and dumped files.
Stack dump:
0. Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/clang++ -g -o /app/output.s -mllvm --x86-asm-syntax=intel -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics
1. :1:23: at annotation token
2. :1:12: parsing function body 'foo'
3. :1:12: in compound statement ('{}')
#0 0x0000000004411d88 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4411d88)
#1 0x000000000440ec34 llvm::sys::RunSignalHandlers() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x440ec34)
#2 0x000000000440f26c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x440f26c)
#3 0x000000000434d098 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
#4 0x0000705f5a445330 (/lib/x86_64-linux-gnu/libc.so.6+0x45330)
#5 0x0000705f5a49ec0c pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x9ec0c)
#6 0x0000705f5a44527e raise (/lib/x86_64-linux-gnu/libc.so.6+0x4527e)
#7 0x0000705f5a4288ff abort (/lib/x86_64-linux-gnu/libc.so.6+0x288ff)
#8 0x0000705f5a42881b (/lib/x86_64-linux-gnu/libc.so.6+0x2881b)
#9 0x0000705f5a43b517 (/lib/x86_64-linux-gnu/libc.so.6+0x3b517)
#10 0x0000000006e009f0 clang::Parser::ParseOptionalCXXScopeSpecifier(clang::CXXScopeSpec&, clang::OpaquePtr, bool, bool, bool*, bool, clang::IdentifierInfo const**, bool, bool, bool, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6e009f0)
#11 0x0000000006de69c8 clang::Parser::ParsePostfixExpressionSuffix(clang::ActionResult) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6de69c8)
#12 0x0000000006ddf7ba clang::Parser::ParseCastExpression(clang::CastParseKind, bool, bool&, clang::TypoCorrectionTypeBehavior, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6ddf7ba)
#13 0x0000000006de1a67 clang::Parser::ParseCastExpression(clang::CastParseKind, bool, clang::TypoCorrectionTypeBehavior, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6de1a67)
#14 0x0000000006de1af9 clang::Parser::ParseAssignmentExpression(clang::TypoCorrectionTypeBehavior) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6de1af9)
#15 0x0000000006de63e9 clang::Parser::ParseExpression(clang::TypoCorrectionTypeBehavior) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6de63e9)
#16 0x0000000006dea274 clang::Parser::ParseParenExpression(clang::ParenParseOption&, bool, clang::ParenExprKind, clang::TypoCorrectionTypeBehavior, clang::OpaquePtr&, clang::SourceLocation&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6dea274)
#17 0x0000000006de043d clang::Parser::ParseCastExpression(clang::CastParseKind, bool, bool&, clang::TypoCorrectionTypeBehavior, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6de043d)
#18 0x0000000006de1a67 clang::Parser::ParseCastExpression(clang::CastParseKind, bool, clang::TypoCorrectionTypeBehavior, bool, bool*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6de1a67)
#19 0x0000000006de1af9 clang::Parser::ParseAssignmentExpression(clang::TypoCorrectionTypeBehavior) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6de1af9)
#20 0x0000000006de63e9 clang::Parser::ParseExpression(clang::TypoCorrectionTypeBehavior) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6de63e9)
#21 0x0000000006e72fa9 clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6e72fa9)
#22 0x0000000006e6a8ef clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::ParsedAttributes&, clang::ParsedAttributes&, clang::LabelDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6e6a8ef)
#23 0x0000000006e6b269 clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector&, clang::Parser::ParsedStmtContext, clang::SourceLocation*, clang::LabelDecl*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6e6b269)
#24 0x0000000006e73785 clang::Parser::ParseCompoundStatementBody(bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6e73785)
#25 0x0000000006e73fca clang::Parser::ParseFunctionStatementBody(clang::Decl*, clang::Parser::ParseScope&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6e73fca)
#26 0x0000000006d703dd clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&, clang::LateParsedAttrList*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6d703dd)
#27 0x0000000006db9d96 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::ParsedAttributes&, clang::Parser::ParsedTemplateInfo&, clang::SourceLocation*, clang::Parser::ForRangeInit*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6db9d96)
#28 0x0000000006d644bb clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6d644bb)
#29 0x0000000006d64caf clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6d64caf)
#30 0x0000000006d717c8 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributes&, clang::ParsedAttributes&, clang::ParsingDeclSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6d717c8)
#31 0x0000000006d72705 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6d72705)
#32 0x0000000006d72af0 clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr&, clang::Sema::ModuleImportState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6d72af0)
#33 0x0000000006d4eabc clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x6d4eabc)
#34 0x0000000004f1edc8 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4f1edc8)
#35 0x000000000524e9e8 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x524e9e8)
#36 0x00000000051dc27d clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x51dc27d)
#37 0x0000000005322cdd clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x5322cdd)
#38 0x0000000000d8e15c cc1_main(llvm::ArrayRef, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd8e15c)
#39 0x0000000000d84e5a ExecuteCC1Tool(llvm::SmallVectorImpl&, llvm::ToolContext const&, llvm::IntrusiveRefCntPtr) driver.cpp:0:0
#40 0x0000000000d84fdd int llvm::function_ref&)>::callback_fn&)>(long, llvm::SmallVectorImpl&) driver.cpp:0:0
#41 0x0000000004f976d9 void llvm::function_ref::callback_fn>, std::__cxx11::basic_string, std::allocator>*, bool*) const::'lambda'()>(long) Job.cpp:0:0
#42 0x000000000434d4d4 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x434d4d4)
#43 0x0000000004f98245 clang::driver::CC1Command::Execute(llvm::ArrayRef>, std::__cxx11::basic_string, std::allocator>*, bool*) const (.part.0) Job.cpp:0:0
#44 0x0000000004f4ffc2 clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4f4ffc2)
#45 0x0000000004f54927 clang::driver::Compilation::ExecuteJobs(clang::driver::JobList const&, llvm::SmallVectorImpl>&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4f54927)
#46 0x0000000004f5f075 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4f5f075)
#47 0x0000000000d8a64a clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd8a64a)
#48 0x0000000000cc859a main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xcc859a)
#49 0x0000705f5a42a1ca (/lib/x86_64-linux-gnu/libc.so.6+0x2a1ca)
#50 0x0000705f5a42a28b __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2a28b)
#51 0x0000000000d84805 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd84805)
clang++: error: clang frontend command failed due to signal (use -v to see invocation)
Compiler returned: 134
```

Start by compiling the reported C++ reproducer with clang++ and then read llvm/tools/clang/lib/Parse/ParseExprCXX.cpp, especially ParseOptionalCXXScopeSpecifier and the annotation-token path shown in the backtrace. Trace how `(auto()->bar::);` is parsed and determine the expected diagnostic. Done means the reproducer no longer triggers the assertion and the behavior is covered by a regression test.

Written by the indexing model from the issue text.