[clang] fix issue 73559. (PR #74926)

[via cfe-commits]

================
@@ -2702,7 +2702,7 @@ Parser::ParseCXXClassMemberDeclaration(AccessSpecifier AS,
   bool MalformedTypeSpec = false;
   if (!TemplateInfo.Kind &&
       Tok.isOneOf(tok::identifier, tok::coloncolon, tok::kw___super)) {
-    if (TryAnnotateCXXScopeToken())
+    if (getLangOpts().CPlusPlus && TryAnnotateCXXScopeToken())
----------------
ChipsSpectre wrote:

ok, it will be changed into an assert.

The assert is not triggered by the *::* test, which will be added to the cxx-in-c.c test.

https://github.com/llvm/llvm-project/pull/74926