Getting rid of SecretKey display methods

Author: dr-orlovsky

src/key.rs

@@ -31,21 +31,6 @@ pub struct SecretKey(pub(crate) [u8; constants::SECRET_KEY_SIZE]);
 impl_array_newtype!(SecretKey, u8, constants::SECRET_KEY_SIZE);
 impl_display_secret!(SecretKey);
 
-impl fmt::LowerHex for SecretKey {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        for ch in &self.0[..] {
-            write!(f, "{:02x}", *ch)?;
-        }
-        Ok(())
-    }
-}
-
-impl fmt::Display for SecretKey {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        fmt::LowerHex::fmt(self, f)
-    }
-}
-
 impl str::FromStr for SecretKey {
     type Err = Error;
     fn from_str(s: &str) -> Result<SecretKey, Error> {
@@ -704,10 +689,11 @@ mod test {
         let pk = PublicKey::from_slice(&[0x02, 0x18, 0x84, 0x57, 0x81, 0xf6, 0x31, 0xc4, 0x8f, 0x1c, 0x97, 0x09, 0xe2, 0x30, 0x92, 0x06, 0x7d, 0x06, 0x83, 0x7f, 0x30, 0xaa, 0x0c, 0xd0, 0x54, 0x4a, 0xc8, 0x87, 0xfe, 0x91, 0xdd, 0xd1, 0x66]).expect("pk");
         let mut buf = [0u8; constants::SECRET_KEY_SIZE * 2];
 
+        #[allow(deprecated)] {
         assert_eq!(
             to_hex(&sk[..], &mut buf).unwrap(),
             "01010101010101010001020304050607ffff0000ffff00006363636363636363"
-        );
+        ) };
         assert_eq!(
             SecretKey::from_str("01010101010101010001020304050607ffff0000ffff00006363636363636363").unwrap(),
             sk