Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

using-decl-pr4450.cpp
// RUN: %clang_cc1 -fsyntax-only -verify %s
// expected-no-diagnostics

namespace A {
  void g();
}

namespace X {
  using A::g; 
}

void h()
{
  A::g();
  X::g();
}