test/SemaCXX/namespace-alias.cpp

   1 // RUN: clang-cc -fsyntax-only -verify %s
   2
   3 namespace N { };
   4
   5 namespace A = N;
   6
   7 int B; // expected-note {{previous definition is here}}
   8 namespace B = N; // expected-error {{redefinition of 'B' as different kind of symbol}}
   9
  10 namespace C { } // expected-note {{previous definition is here}}
  11 namespace C = N; // expected-error {{redefinition of 'C'}}
  12
  13 int i;
  14 namespace D = i; // expected-error {{expected namespace name}}
  15
  16 namespace E = N::Foo; // expected-error {{expected namespace name}}
  17
  18 namespace F {
  19   namespace A { namespace B { } } // expected-note {{candidate found by name lookup is 'F::A::B'}}
  20   namespace B { } // expected-note {{candidate found by name lookup is 'F::B'}}
  21   using namespace A;
  22   namespace D = B; // expected-error {{reference to 'B' is ambiguous}}
  23 }
  24
  25 namespace G {
  26   namespace B = N;
  27 }
  28
  29 namespace H {
  30   namespace A1 { }
  31   namespace A2 { }
  32
  33   // These all point to A1.
  34   namespace B = A1; // expected-note {{previous definition is here}}
  35   namespace B = A1;
  36   namespace C = B;
  37   namespace B = C;
  38
  39   namespace B = A2; // expected-error {{redefinition of 'B' as different kind of symbol}}
  40 }
  41
  42 namespace I {
  43   namespace A1 { int i; }
  44
  45   namespace A2 = A1;
  46 }
  47
  48 int f() {
  49   return I::A2::i;
  50 }
  51
  52 namespace J {
  53   namespace A {
  54     namespace B { void func (); }
  55   }
  56
  57   namespace C = A;
  58
  59   using namespace C::B;
  60
  61   void g() {
  62     func();
  63   }
  64 }