text: // RUN: %clang_cc1 -triple x86_64-linux-unknown -emit-llvm %s -o - | FileCheck %s
  
  #pragma GCC visibility push(hidden)
  
  struct Base {
    virtual ~Base() = default;
    virtual void* Alloc() = 0;
  };
  
  class Child : public Base {
  public:
    Child() = default;
    void* Alloc();
  };
  
  void test() {
    Child x;
  }
  
  // CHECK: @_ZTV5Child = external hidden unnamed_addr constant
  