================
@@ -1581,26 +1581,33 @@ class TemplateTemplateParmDecl final
       DefaultArgStorage<TemplateTemplateParmDecl, TemplateArgumentLoc *>;
   DefArgStorage DefaultArgument;
 
+  /// Whether this template template parameter was declaration with
+  /// the 'typename' keyword.
+  ///
+  /// If false, it was declared with the 'class' keyword.
+  bool Typename : 1;
----------------
erichkeane wrote:

I like the bitfield nature here, but would prefer we do an 'unsigned' for each, 
and just 'treat' them as a bool later (it is a bit of a convention here).

Additionally, `Typename` should have an enum value that it gets compared to, 
rather than true meaning typename, false meaning class.

https://github.com/llvm/llvm-project/pull/88139
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