[clang] [clang][Sema] Diagnose nested local classes defined in a different block scope than their parent (PR #197863)

[Vlad Serebrennikov via cfe-commits]

================
@@ -1,30 +1,91 @@
-// RUN: %clang_cc1 -fsyntax-only -verify %s 
-
-void f1() {
-  struct X {
-    struct Y;
-  };
-  
-  struct X::Y {
-    void f() {}
-  };
-}
-
-void f2() {
-  struct X {
-    struct Y;
-    
-    struct Y {
-      void f() {}
-    };
-  };
-}
-
-// A class nested within a local class is a local class.
-void f3(int a) { // expected-note{{'a' declared here}}
-  struct X {
-    struct Y {
-      int f() { return a; } // expected-error{{reference to local variable 'a' declared in enclosing function 'f3'}}
-    };
-  };
-}
+// RUN: %clang_cc1 -fsyntax-only -verify %s
----------------
Endilll wrote:

Can you switch this test to `-verify-directives`? In general I think this test would benefit from C++ DR test conventions, like `@-1`.

https://github.com/llvm/llvm-project/pull/197863