gcc/testsuite/g++.old-deja/g++.ns/main1.C

// { dg-do assemble  }

// main is only reserved in the global namespace [basic.start.main]/3

// submitted by Gerald Gutierrez <gutier@intergate.bc.ca>

namespace A { void main () { } }
namespace B { void main () { } }
namespace C {
  void main () { }
  namespace D {
    void main () { }
  }
}