[clang] [Clang][Sema] Reject declaring an alias template with the same name as its template parameter. (PR #123533)

[via cfe-commits]

================
@@ -13464,6 +13464,14 @@ Decl *Sema::ActOnAliasDeclaration(Scope *S, 
AccessSpecifier AS,
     }
     TemplateParameterList *TemplateParams = TemplateParamLists[0];
 
+    // Check shadowing of a template parameter name
+    for (NamedDecl *TP : TemplateParams->asArray()) {
+      if (NameInfo.getName() == TP->getDeclName()) {
+        DiagnoseTemplateParameterShadow(Name.StartLocation, TP);
+        return nullptr;
+      }
+    }
+
----------------
MagentaTreehouse wrote:

Code to skip up scope was originally added here: 
https://github.com/llvm/llvm-project/commit/3f1b5d077b7e68c0c801a56f17b05dab96f7f992#diff-9ced4fa47ee2b9c03b6996ce89a1d131c0f5b71013993bc582209f50d5e934daR4713-R4715

https://github.com/llvm/llvm-project/pull/123533
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