<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/136119>136119</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Clang-21 crash with: Assertion `qualifier->getPrefix()' failed.
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
      </td>
    </tr>

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

    <tr>
      <th>Reporter</th>
      <td>
          hyf751175784
      </td>
    </tr>
</table>

<pre>
    ### Description
I encountered a crash in Clang-21 when compiling the following code:
```cpp
template <class T>
struct A
{
  template <class V>
 struct B
  {
    int MEM;
  };
};
struct D {};
struct C: public A<int>::B<D>
{};
template <class T, class U, class V>
auto k(T t, U u, V v) -> decltype (t.U::template B<V>::MEM)
{}
int main()
{
  k( C(), A<int>(), D() );
}
```
### Clang Version

```sh
$ clang -v
Ubuntu clang version 21.0.0 (++20250415083614+85eb44e304e0-1~exp~20250415203631.375)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/local/llvm-21/bin
Found candidate GCC installation: /usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/15.0.0
Found candidate GCC installation: /usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/15.0.1
Selected GCC installation: /usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/15.0.1
Candidate multilib: .;@m64
Selected multilib: .;@m64
```

### Command
The compilation command used was:
```sh
clang++ bug.cpp  -O3 -Wall -Wextra -fno-strict-aliasing -fwrapv -g -fsanitize=address  -c -o bug.o
```

### Error Message
```sh
<source>:14:15: warning: unused parameter 'u' [-Wunused-parameter]
   14 | auto k(T t, U u, V v) -> decltype (t.U::template B<V>::MEM)
      |               ^
<source>:14:20: warning: unused parameter 'v' [-Wunused-parameter]
   14 | auto k(T t, U u, V v) -> decltype (t.U::template B<V>::MEM)
      |                    ^
clang++: /root/llvm-project/llvm/tools/clang/lib/AST/ItaniumMangle.cpp:2230: void {anonymous}::CXXNameMangler::manglePrefix(clang::NestedNameSpecifier*): Assertion `qualifier->getPrefix()' 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 -fno-verbose-asm -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics -O3 -Wall -Wextra -fno-strict-aliasing -fwrapv -g -fsanitize=address <source>
1.      <eof> parser at end of file
2.      <source>:16:5: LLVM IR generation of declaration 'main'
3.      <source>:16:5: Generating code for declaration 'main'
4.      <source>:14:6: Mangling declaration 'k'
 #0 0x0000000003edfde8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3edfde8)
 #1 0x0000000003edda74 llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3edda74)
 #2 0x0000000003e225b8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x0000751c19042520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x0000751c190969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x0000751c19042476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x0000751c190287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x0000751c1902871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x0000751c19039e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x0000000007a38fb4 (anonymous namespace)::CXXNameMangler::manglePrefix(clang::NestedNameSpecifier*) ItaniumMangle.cpp:0:0
#10 0x0000000007a39244 (anonymous namespace)::CXXNameMangler::mangleTemplatePrefix(clang::TemplateName) ItaniumMangle.cpp:0:0
#11 0x0000000007a39a8f (anonymous namespace)::CXXNameMangler::mangleUnresolvedPrefix(clang::NestedNameSpecifier*, bool) ItaniumMangle.cpp:0:0
#12 0x0000000007a3b039 (anonymous namespace)::CXXNameMangler::mangleUnresolvedName(clang::NestedNameSpecifier*, clang::DeclarationName, clang::TemplateArgumentLoc const*, unsigned int, unsigned int) ItaniumMangle.cpp:0:0
#13 0x0000000007a2af90 (anonymous namespace)::CXXNameMangler::mangleExpression(clang::Expr const*, unsigned int, bool) ItaniumMangle.cpp:0:0
#14 0x0000000007a2230d (anonymous namespace)::CXXNameMangler::mangleType(clang::QualType) ItaniumMangle.cpp:0:0
#15 0x0000000007a2e89e (anonymous namespace)::CXXNameMangler::mangleBareFunctionType(clang::FunctionProtoType const*, bool, clang::FunctionDecl const*) ItaniumMangle.cpp:0:0
#16 0x0000000007a2ff25 (anonymous namespace)::CXXNameMangler::mangleFunctionEncoding(clang::GlobalDecl) ItaniumMangle.cpp:0:0
#17 0x0000000007a31047 (anonymous namespace)::CXXNameMangler::mangle(clang::GlobalDecl) ItaniumMangle.cpp:0:0
#18 0x0000000007a336d1 (anonymous namespace)::ItaniumMangleContextImpl::mangleCXXName(clang::GlobalDecl, llvm::raw_ostream&) ItaniumMangle.cpp:0:0
#19 0x0000000007a58463 clang::MangleContext::mangleName(clang::GlobalDecl, llvm::raw_ostream&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x7a58463)
#20 0x000000000444e934 getMangledNameImpl(clang::CodeGen::CodeGenModule&, clang::GlobalDecl, clang::NamedDecl const*, bool) CodeGenModule.cpp:0:0
#21 0x00000000044665bd clang::CodeGen::CodeGenModule::getMangledName(clang::GlobalDecl) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x44665bd)
#22 0x00000000044a07d5 clang::CodeGen::CodeGenModule::GetAddrOfFunction(clang::GlobalDecl, llvm::Type*, bool, bool, clang::CodeGen::ForDefinition_t) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x44a07d5)
#23 0x000000000421830e clang::CodeGen::CodeGenModule::getRawFunctionPointer(clang::GlobalDecl, llvm::Type*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x421830e)
#24 0x0000000004224724 EmitDirectCallee(clang::CodeGen::CodeGenFunction&, clang::GlobalDecl) CGExpr.cpp:0:0
#25 0x0000000004243912 clang::CodeGen::CodeGenFunction::EmitCallee(clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4243912)
#26 0x000000000424388f clang::CodeGen::CodeGenFunction::EmitCallee(clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x424388f)
#27 0x00000000042456a3 clang::CodeGen::CodeGenFunction::EmitCallExpr(clang::CallExpr const*, clang::CodeGen::ReturnValueSlot, llvm::CallBase**) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x42456a3)
#28 0x00000000042b72e4 (anonymous namespace)::ScalarExprEmitter::VisitCallExpr(clang::CallExpr const*) CGExprScalar.cpp:0:0
#29 0x00000000042aa550 clang::StmtVisitorBase<std::add_pointer, (anonymous namespace)::ScalarExprEmitter, llvm::Value*>::Visit(clang::Stmt*) CGExprScalar.cpp:0:0
#30 0x00000000042b02dc clang::CodeGen::CodeGenFunction::EmitScalarExpr(clang::Expr const*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x42b02dc)
#31 0x000000000421c68e clang::CodeGen::CodeGenFunction::EmitAnyExpr(clang::Expr const*, clang::CodeGen::AggValueSlot, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x421c68e)
#32 0x000000000424360d clang::CodeGen::CodeGenFunction::EmitIgnoredExpr(clang::Expr const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x424360d)
#33 0x00000000043b5e2e clang::CodeGen::CodeGenFunction::EmitStmt(clang::Stmt const*, llvm::ArrayRef<clang::Attr const*>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x43b5e2e)
#34 0x00000000043bdd9c clang::CodeGen::CodeGenFunction::EmitCompoundStmtWithoutScope(clang::CompoundStmt const&, bool, clang::CodeGen::AggValueSlot) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x43bdd9c)
#35 0x0000000004423c52 clang::CodeGen::CodeGenFunction::EmitFunctionBody(clang::Stmt const*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4423c52)
#36 0x0000000004437005 clang::CodeGen::CodeGenFunction::GenerateCode(clang::GlobalDecl, llvm::Function*, clang::CodeGen::CGFunctionInfo const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4437005)
#37 0x00000000044a0d9a clang::CodeGen::CodeGenModule::EmitGlobalFunctionDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x44a0d9a)
#38 0x000000000449bb34 clang::CodeGen::CodeGenModule::EmitGlobalDefinition(clang::GlobalDecl, llvm::GlobalValue*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x449bb34)
#39 0x000000000449bf4b clang::CodeGen::CodeGenModule::EmitGlobal(clang::GlobalDecl) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x449bf4b)
#40 0x00000000044a67a3 clang::CodeGen::CodeGenModule::EmitTopLevelDecl(clang::Decl*) (.part.0) CodeGenModule.cpp:0:0
#41 0x0000000004880ab6 (anonymous namespace)::CodeGeneratorImpl::HandleTopLevelDecl(clang::DeclGroupRef) ModuleBuilder.cpp:0:0
#42 0x00000000048705b4 clang::BackendConsumer::HandleTopLevelDecl(clang::DeclGroupRef) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x48705b4)
#43 0x000000000652bfc4 clang::ParseAST(clang::Sema&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x652bfc4)
#44 0x000000000487cc58 clang::CodeGenAction::ExecuteAction() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x487cc58)
#45 0x0000000004b6f1f5 clang::FrontendAction::Execute() (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4b6f1f5)
#46 0x0000000004aee25e clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4aee25e)
#47 0x0000000004c5e51e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x4c5e51e)
#48 0x0000000000d99d8f cc1_main(llvm::ArrayRef<char const*>, char const*, void*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd99d8f)
#49 0x0000000000d9149a ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&, llvm::ToolContext const&) driver.cpp:0:0
#50 0x00000000048e3139 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
#51 0x0000000003e22a54 llvm::CrashRecoveryContext::RunSafely(llvm::function_ref<void ()>) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x3e22a54)
#52 0x00000000048e374f 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
#53 0x00000000048a5bad clang::driver::Compilation::ExecuteCommand(clang::driver::Command const&, clang::driver::Command const*&, bool) const (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x48a5bad)
#54 0x00000000048a6c3e 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+++0x48a6c3e)
#55 0x00000000048aea95 clang::driver::Driver::ExecuteCompilation(clang::driver::Compilation&, llvm::SmallVectorImpl<std::pair<int, clang::driver::Command const*>>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x48aea95)
#56 0x0000000000d96ad8 clang_main(int, char**, llvm::ToolContext const&) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd96ad8)
#57 0x0000000000c21504 main (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xc21504)
#58 0x0000751c19029d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#59 0x0000751c19029e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#60 0x0000000000d90f45 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0xd90f45)
clang++: error: clang frontend command failed with exit code 134 (use -v to see invocation)
Compiler returned: 134
```

The issue can also be reproduced on Compiler Explorer:https://godbolt.org/z/Tccqcd45x
Please let me know if you need any more details.
</pre>
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