llvm-project/clang/test/CodeGenCXX/derived-to-base.cpp

// RUN: %clang_cc1 -emit-llvm %s -o -
struct A { 
  void f(); 
  
  int a;
};

struct B : A { 
  double b;
};

void f() {
  B b;
  
  b.f();
}