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

[via cfe-commits]

================
@@ -10267,6 +10267,9 @@ def ext_ms_anonymous_record : ExtWarn<
 def err_reference_to_local_in_enclosing_context : Error<
   "reference to local %select{variable|binding}1 %0 declared in enclosing "
   "%select{%3|block literal|lambda expression|context}2">;
+def err_local_nested_class_invalid_scope : Error<
+  "nested local class %0 must be defined in the same block scope as "
----------------
Sirraide wrote:

> Sorry, your test case is actually ill-formed and is on line 69 in `p3.cpp`

I don’t think it’s that one either because `A` is not inside another class

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