lldb/test/API/functionalities/tail_call_frames/ambiguous_tail_call_seq2/main.cpp

volatile int x;

void __attribute__((noinline)) sink() {
  x++; //% self.filecheck("bt", "main.cpp")
  // CHECK-NOT: func{{[23]}}
}

void func2();

void __attribute__((noinline)) func1() {
  if (x < 1)
    func2();
  else
    sink();
}

void __attribute__((noinline)) func2() {
  if (x < 1)
    sink();
  else
    func1();
}

int main() {
  // Tail recursion creates ambiguous execution histories.
  x = 0;
  func1();
  return 0;
}