#include <metal_stdlib>
using namespace metal;

#define TINT_ISOLATE_UB(VOLATILE_NAME) \
  volatile bool VOLATILE_NAME = true; \
  if (VOLATILE_NAME)

kernel void f() {
  int i = 0;
  {
    TINT_ISOLATE_UB(tint_volatile_true) while(true) {
      bool tint_continue = false;
      switch(i) {
        case 0:
        {
          tint_continue = true;
          break;
        }
        default:
        {
          break;
        }
      }
      if (tint_continue) {
        {
          i = (i + 1);
          if ((i >= 4)) { break; }
        }
        continue;
      }
      {
        i = (i + 1);
        if ((i >= 4)) { break; }
      }
      continue;
    }
  }
}