ICE in `clang::Sema::ActOnUsingEnumDeclaration` given invalid `using enum B::E;`

[Quuxplusone]

https://godbolt.org/z/e9EPndKoY

struct D {
  using enum B::E;
};

Compile with clang++ -std=c++20 test.cpp. Clang trunk assert-fails:

<source>:2:14: error: use of undeclared identifier 'B'
    2 |   using enum B::E;
      |              ^
clang++: /root/llvm-project/clang/lib/Sema/SemaDeclCXX.cpp:12357: clang::Decl* clang::Sema::ActOnUsingEnumDeclaration(clang::Scope*, clang::AccessSpecifier, clang::SourceLocation, clang::SourceLocation, clang::SourceLocation, clang::IdentifierInfo&, clang::CXXScopeSpec*): Assertion `!SS->isInvalid() && "ScopeSpec is invalid"' 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 -S --gcc-toolchain=/opt/compiler-explorer/gcc-snapshot -fcolor-diagnostics -fno-crash-diagnostics -std=c++23 <source>
1.	<source>:2:18: current parser token ';'
2.	<source>:1:1: parsing struct/union/class body 'D'
 #0 0x00000000037c45b8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x37c45b8)
 #1 0x00000000037c229c llvm::sys::CleanupOnSignal(unsigned long) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x37c229c)
 #2 0x000000000370a0e8 CrashRecoverySignalHandler(int) CrashRecoveryContext.cpp:0:0
 #3 0x00007fa39e242520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #4 0x00007fa39e2969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #5 0x00007fa39e242476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #6 0x00007fa39e2287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #7 0x00007fa39e22871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #8 0x00007fa39e239e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #9 0x00000000063def42 clang::Sema::ActOnUsingEnumDeclaration(clang::Scope*, clang::AccessSpecifier, clang::SourceLocation, clang::SourceLocation, clang::SourceLocation, clang::IdentifierInfo&, clang::CXXScopeSpec*) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x63def42)
#10 0x00000000060115ff clang::Parser::ParseUsingDeclaration(clang::DeclaratorContext, clang::Parser::ParsedTemplateInfo const&, clang::SourceLocation, clang::SourceLocation&, clang::ParsedAttributes&, clang::AccessSpecifier) (/opt/compiler-explorer/clang-assertions-trunk/bin/clang+++0x60115ff)

llvm#57347 is related, at least in that it's another case of ActOnUsingEnumDeclaration not handling syntax errors very well.