message: Remove support for zero padding
diff: @@ -621,8 +621,8 @@ macro_rules! write_complex {
  let abs_re = if $re < Zero::zero() { $T::zero() - $re.clone() } else { $re.clone() };
  let abs_im = if $im < Zero::zero() { $T::zero() - $im.clone() } else { $im.clone() };
  - let mut real: String;
  - let mut imag: String;
  + let real: String;
  + let imag: String;
  if let Some(prec) = $f.precision() {
  real = format!(concat!("{:.1$", $t, "}"), abs_re, prec);
  @@ -642,18 +642,6 @@ macro_rules! write_complex {
  ""
  };
  - if $f.sign_aware_zero_pad() && $f.width().is_some() {
  - let total_width = $f.width().unwrap();
  - // Subtract leading sign, two prefixes, middle operator and trailing 'i'
  - // to obtain the width scalars need to be padded to
  - let subtract = sign.len() + prefix.len()*2 + 1 + 1;
  - let scalar_width = total_width - subtract;
  - let real_width = scalar_width - (scalar_width/2);
  - let imag_width = scalar_width/2;
  - real = format!("{0:0>1$}", real, real_width);
  - imag = format!("{0:0>1$}", imag, imag_width);
  - }
  -
  let complex = if $im < Zero::zero() {
  format!("{}{pre}{re}-{pre}{im}i", sign, re=real, im=imag, pre=prefix)
  }
  @@ -1314,18 +1302,17 @@ mod test {
  assert_eq!(format!("{}", a), "1.23456+123.456i");
  assert_eq!(format!("{:.2}", a), "1.23+123.46i");
  assert_eq!(format!("{:.2e}", a), "1.23e0+1.23e2i");
  - assert_eq!(format!("{:+020.2E}", a), "+0001.23E0+001.23E2i");
  + assert_eq!(format!("{:+20.2E}", a), " +1.23E0+1.23E2i");
  let b = Complex::new(0x80, 0xff);
  assert_eq!(format!("{:X}", b), "80+FFi");
  assert_eq!(format!("{:#x}", b), "0x80+0xffi");
  assert_eq!(format!("{:+#b}", b), "+0b10000000+0b11111111i");
  assert_eq!(format!("{:+#16o}", b), " +0o200+0o377i");
  - assert_eq!(format!("{:+#016x}", b), "+0x00080+0x00ffi");
  let c = Complex::new(-10, -10000);
  assert_eq!(format!("{}", c), "-10-10000i");
  - assert_eq!(format!("{:016}", c), "-0000010-010000i");
  + assert_eq!(format!("{:16}", c), " -10-10000i");
  }
  #[test]
  