llvm-project

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// RUN: %clang_cc1 -fsyntax-only -verify %s
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class A {};
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namespace B {
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  namespace A {} // expected-note{{namespace '::B::A' defined here}} \
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                 // expected-note 2{{namespace 'B::A' defined here}}
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  using namespace A ;
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}
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namespace C {} // expected-note{{namespace 'C' defined here}}
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namespace D {
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  class C {
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    using namespace B ; // expected-error{{not allowed}}
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  };
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  namespace B {}
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  using namespace C ;
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  using namespace B::A ; // expected-error{{no namespace named 'A' in namespace 'D::B'; did you mean '::B::A'?}}
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  using namespace ::B::A ;
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  using namespace ::D::F ; // expected-error{{expected namespace name}}
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  using namespace ::D::C ; // expected-error{{no namespace named 'C' in namespace 'D'; did you mean simply 'C'?}}
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}
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using namespace ! ; // expected-error{{expected namespace name}}
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using namespace A ; // expected-error{{no namespace named 'A'; did you mean 'B::A'?}}
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using namespace ::A // expected-error{{no namespace named 'A' in the global namespace; did you mean 'B::A'?}} \
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                    // expected-error{{expected ';' after namespace name}}
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                    B ; 
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void test_nslookup() {
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  int B;
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  class C;
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  using namespace B;
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  using namespace C;
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}
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