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      1 // RUN: %clang_cc1 -fsyntax-only -verify %s
      2 
      3 class A {};
      4 
      5 namespace B {
      6   namespace A {} // expected-note{{namespace '::B::A' defined here}}
      7   using namespace A ;
      8 }
      9 
     10 namespace C {}
     11 
     12 namespace D {
     13 
     14   class C {
     15 
     16     using namespace B ; // expected-error{{not allowed}}
     17   };
     18 
     19   namespace B {}
     20 
     21   using namespace C ;
     22   using namespace B::A ; // expected-error{{no namespace named 'A' in namespace 'D::B'; did you mean '::B::A'?}}
     23   using namespace ::B::A ;
     24   using namespace ::D::C ; // expected-error{{expected namespace name}}
     25 }
     26 
     27 using namespace ! ; // expected-error{{expected namespace name}}
     28 using namespace A ; // expected-error{{expected namespace name}}
     29 using namespace ::A // expected-error{{expected namespace name}} \
     30                     // expected-error{{expected ';' after namespace name}}
     31                     B ;
     32 
     33 void test_nslookup() {
     34   int B;
     35   class C;
     36   using namespace B;
     37   using namespace C;
     38 }
     39