From cabb8f9e6fc11ec42d8ce8ebfc64d62c8bf0720a Mon Sep 17 00:00:00 2001
From: Martin Habovstiak <martin.habovstiak@gmail.com>
Date: Thu, 24 Feb 2022 16:27:38 +0100
Subject: [PATCH 1/2] Implemented `TryFrom<{u8, i32}>` for `Parity`

---
 src/key.rs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/key.rs b/src/key.rs
index 4f715d8..8d883aa 100644
--- a/src/key.rs
+++ b/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 {

From df081bede00a61f410f2c2f5aff8ab0e134003f0 Mon Sep 17 00:00:00 2001
From: Martin Habovstiak <martin.habovstiak@gmail.com>
Date: Mon, 28 Feb 2022 21:13:54 +0100
Subject: [PATCH 2/2] Changed impl `Error::cause()` to `Error::source()`

This implements `source()` method instead of `cause()` allowing
downcasting.
---
 src/lib.rs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index f1cc959..050b674 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -377,8 +377,7 @@ 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,