[clang] [Clang] disallow the use of asterisks preceding constructor and destructor names (PR #122621)

[Oleksandr T. via cfe-commits]

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@@ -96,3 +96,49 @@ namespace PR38286 {
   template<typename> struct C; // expected-note {{non-type declaration found}}
   template<typename T> C<T>::~C() {} // expected-error {{identifier 'C' after '~' in destructor name does not name a type}}
 }
+
+namespace GH121706 {
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a-tarasyuk wrote:

@cor3ntin I've added tests to cover these cases and additional tests to address 
https://eel.is/c++draft/class.conv.fct#1., if I've missed any cases from the spec, I'd appreciate it if you could point them out. thanks

https://github.com/llvm/llvm-project/pull/122621