Merge #409: After MSRV bump: Implemented TryFrom<{u8, i32}> for Parity

df081be Changed impl `Error::cause()` to `Error::source()` (Martin Habovstiak)
cabb8f9 Implemented `TryFrom<{u8, i32}>` for `Parity` (Martin Habovstiak)

Pull request description:

ACKs for top commit:
  tcharding:
    ACK df081be
  apoelstra:
    ACK df081be

Tree-SHA512: 5587a9684a4bfc1f659548a3787ff3602c56b2d6db72e89783529b85b670b681bce7e99683c751a03697c8faa1c2aa2f314c2c9b28e16e4c53fd07b01e949af2

Author: apoelstra

src/key.rs

@@ -1277,6 +1277,24 @@ impl Parity {
     }
 }
 
+/// `Even` for `0`, `Odd` for `1`, error for anything else
+impl TryFrom<i32> for Parity {
+    type Error = InvalidParityValue;
+
+    fn try_from(parity: i32) -> Result<Self, Self::Error> {
+        Self::from_i32(parity)
+    }
+}
+
+/// `Even` for `0`, `Odd` for `1`, error for anything else
+impl TryFrom<u8> for Parity {
+    type Error = InvalidParityValue;
+
+    fn try_from(parity: u8) -> Result<Self, Self::Error> {
+        Self::from_u8(parity)
+    }
+}
+
 /// The conversion returns `0` for even parity and `1` for odd.
 impl From<Parity> for i32 {
     fn from(parity: Parity) -> i32 {

src/lib.rs

@@ -372,8 +372,7 @@ impl fmt::Display for Error {
 #[cfg(feature = "std")]
 #[cfg_attr(docsrs, doc(cfg(feature = "std")))]
 impl std::error::Error for Error {
-    #[allow(deprecated)]
-    fn cause(&self) -> Option<&dyn std::error::Error> {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
         match self {
             Error::IncorrectSignature => None,
             Error::InvalidMessage => None,