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  1. #include <iostream>
  2.  
  3. namespace X {namespace A {struct A {A() {std::cout << "X::A::A\n";}};}}
  4. struct A {A() {std::cout << "::A\n";}};
  5. using namespace X;
  6.  
  7. struct A a;
  8. struct A::A b;
  9.  
  10. int main() {}
  11.  
Success #stdin #stdout 0s 3096KB
stdin
Standard input is empty
stdout
::A
X::A::A