#include <metal_stdlib>

using namespace metal;

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

void f() {
  int i = 0;
  TINT_ISOLATE_UB(tint_volatile_true) for(; (i < 4); ) {
  }
}