message: a few more inf/nan/negz tests
diff: @@ -18,9 +18,22 @@ fn main() {
  assert_eq(-{5.0_f64}, -5.0_f64);
  // infinities, NaN
  assert!((5.0_f32/0.0).is_infinite());
  + assert_ne!({5.0_f32/0.0}, {-5.0_f32/0.0});
  assert!((5.0_f64/0.0).is_infinite());
  + assert_ne!({5.0_f64/0.0}, {5.0_f64/-0.0});
  assert!((-5.0_f32).sqrt().is_nan());
  assert!((-5.0_f64).sqrt().is_nan());
  + assert_ne!(f32::NAN, f32::NAN);
  + assert_ne!(f64::NAN, f64::NAN);
  + // negative zero
  + let posz = 0.0f32;
  + let negz = -0.0f32;
  + assert_eq(posz, negz);
  + assert_ne!(posz.to_bits(), negz.to_bits());
  + let posz = 0.0f64;
  + let negz = -0.0f64;
  + assert_eq(posz, negz);
  + assert_ne!(posz.to_bits(), negz.to_bits());
  // byte-level transmute
  let x: u64 = unsafe { std::mem::transmute(42.0_f64) };
  let y: f64 = unsafe { std::mem::transmute(x) };
  