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Compiler Error C2881

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'namespace1' : is already used as an alias for 'namespace2'

You cannot use the same name as an alias for two namespaces.

The following sample generates C2881:

// C2881.cpp
// compile with: /c
namespace A {
   int k;
}

namespace B {
   int i;
}

namespace C = A;
namespace C = B;   // C2881 C is already an alias for A