#include <metal_stdlib>
using namespace metal;

#define TINT_ISOLATE_UB(VOLATILE_NAME) \
  {volatile bool VOLATILE_NAME = false; if (VOLATILE_NAME) break;}

void f() {
  int i = 0;
  {
    while(true) {
      TINT_ISOLATE_UB(tint_volatile_false)
      if ((i < 4)) {
      } else {
        break;
      }
      {
      }
      continue;
    }
  }
}