<dawn>/test/tint/diagnostic_filtering/loop_attribute.wgsl:5:9 warning: 'dpdx' must only be called from uniform control flow
    _ = dpdx(1.0);
        ^^^^^^^^^

<dawn>/test/tint/diagnostic_filtering/loop_attribute.wgsl:7:7 note: control flow depends on possibly non-uniform value
      break if x > 0.0;
      ^^^^^

<dawn>/test/tint/diagnostic_filtering/loop_attribute.wgsl:7:16 note: user-defined input 'x' of 'main' may be non-uniform
      break if x > 0.0;
               ^

#include <metal_stdlib>

using namespace metal;

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

struct tint_symbol_2 {
  float x [[user(locn0)]];
};

void tint_symbol_inner(float x) {
  TINT_ISOLATE_UB(tint_volatile_true) while(true) {
    float const tint_phony = dfdx(1.0f);
    {
      if ((x > 0.0f)) { break; }
    }
  }
}

fragment void tint_symbol(tint_symbol_2 tint_symbol_1 [[stage_in]]) {
  tint_symbol_inner(tint_symbol_1.x);
  return;
}