[clang] [clang] fix matching of nested template template parameters (PR #130447)

[Younan Zhang via cfe-commits]

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@@ -11363,14 +11363,17 @@ class Sema final : public SemaBase {
 
   /// The context in which we are checking a template parameter list.
   enum TemplateParamListContext {
-    TPC_ClassTemplate,
-    TPC_VarTemplate,
+    // For this context, Class, Variable, TypeAlias, and non-pack Template
+    // Template
+    // Parameters are the same.
+    TPC_Normal,
+
     TPC_FunctionTemplate,
     TPC_ClassTemplateMember,
     TPC_FriendClassTemplate,
     TPC_FriendFunctionTemplate,
     TPC_FriendFunctionTemplateDefinition,
-    TPC_TypeAliasTemplate
+    TPC_TemplateTemplateParameterPack
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zyn0217 wrote:

nit: Can we have a trailing comma here?

https://github.com/llvm/llvm-project/pull/130447