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

[Valentyn Yukhymenko via cfe-commits]

================
@@ -65,7 +65,8 @@ namespace InFunctions {
   template<typename...T> struct S3 { // expected-note {{template parameter is 
declared here}}
     template<typename Z> using T = int; // expected-error {{declaration of 'T' 
shadows template parameter}}
   };
-  template<typename Z> using Z = Z;
+  template<typename Z> // expected-note {{template parameter is declared here}}
+  using Z = Z; // expected-error {{declaration of 'Z' shadows template 
parameter}}
----------------
BaLiKfromUA wrote:

I am not sure that `InFunctions` is the correct namespace for this test but it 
was here before and I adapted this use case to the new behavior.

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