Create a new channel as a copy of main.
Rename main to:
Delete main? This cannot be undone.
// RUN: %clang_cc1 -fsyntax-only -verify %s struct A { }; void f() { struct B : private A {}; // expected-note{{declared private here}} B b; A *a = &b; // expected-error{{cannot cast 'B' to its private base class 'A'}} }