[clang] [SemaCXX] Disallow deducing "this" on operator new and delete

Resolves Issue #82249

Author: Rajveer100

clang/lib/Sema/SemaDeclCXX.cpp

@@ -11391,7 +11391,9 @@ void Sema::CheckExplicitObjectMemberFunction(Declarator &D,
         << ExplicitObjectParam->getSourceRange();
   }
 
-  if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static) {
+  if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static ||
+      (D.getContext() == clang::DeclaratorContext::Member &&
+       D.isStaticMember())) {
     Diag(ExplicitObjectParam->getBeginLoc(),
          diag::err_explicit_object_parameter_nonmember)
         << D.getSourceRange() << /*static=*/0 << IsLambda;

clang/test/SemaCXX/cxx2b-deducing-this.cpp

@@ -16,6 +16,10 @@ struct S {
     static void f(this auto); // expected-error{{an explicit object parameter cannot appear in a static function}}
     virtual void f(this S); // expected-error{{an explicit object parameter cannot appear in a virtual function}}
 
+    // new and delete are implicitly static
+    void *operator new(this unsigned long); // expected-error{{an explicit object parameter cannot appear in a static function}}
+    void operator delete(this void*); // expected-error{{an explicit object parameter cannot appear in a static function}}
+    
     void g(this auto) const; // expected-error{{explicit object member function cannot have 'const' qualifier}}
     void h(this auto) &; // expected-error{{explicit object member function cannot have '&' qualifier}}
     void i(this auto) &&; // expected-error{{explicit object member function cannot have '&&' qualifier}}