Hi,

In [basic.lookup.unqual]:

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An unqualified search in a scope S from a program point P includes the results
of searches from P in
— S, and
— for any scope U that contains P and is or is contained by S, each namespace
contained by S that is nominated by a using-directive that is active in U at P.

**********************************************

namespace A {
     int a;
}

namespace S {
     namespace T {
      namespace U {
          using namespace A;
     int p = a;
 }
     }
}

int main()
{
}

**********************************************

"namespace A" is not contained in "namespace S". So what does the second
statement mean ?