Remove definitions of deprecated Error::description() and

`Error::cause()`.

src/error.rs

@@ -78,30 +78,15 @@ extern crate std;
 #[derive(Clone, Copy, Debug, PartialEq)]
 pub struct Unspecified;
 
-impl Unspecified {
-    fn description_() -> &'static str {
-        "ring::error::Unspecified"
-    }
-}
-
 // This is required for the implementation of `std::error::Error`.
 impl core::fmt::Display for Unspecified {
     fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
-        f.write_str(Self::description_())
+        f.write_str("ring::error::Unspecified")
     }
 }
 
 #[cfg(feature = "std")]
-impl std::error::Error for Unspecified {
-    #[inline]
-    fn cause(&self) -> Option<&dyn std::error::Error> {
-        None
-    }
-
-    fn description(&self) -> &str {
-        Self::description_()
-    }
-}
+impl std::error::Error for Unspecified {}
 
 impl From<untrusted::EndOfInput> for Unspecified {
     fn from(_: untrusted::EndOfInput) -> Self {
@@ -117,10 +102,10 @@ impl From<core::array::TryFromSliceError> for Unspecified {
 
 /// An error parsing or validating a key.
 ///
-/// The `Display` implementation and `<KeyRejected as Error>::description()`
-/// will return a string that will help you better understand why a key was
-/// rejected change which errors are reported in which situations while
-/// minimizing the likelihood that any applications will be broken.
+/// The `Display` implementation will return a string that will help you better
+/// understand why a key was rejected change which errors are reported in which
+/// situations while minimizing the likelihood that any applications will be
+/// broken.
 ///
 /// Here is an incomplete list of reasons a key may be unsupported:
 ///
@@ -149,11 +134,6 @@ impl From<core::array::TryFromSliceError> for Unspecified {
 pub struct KeyRejected(&'static str);
 
 impl KeyRejected {
-    /// The value returned from <Self as std::error::Error>::description()
-    pub fn description_(&self) -> &'static str {
-        self.0
-    }
-
     pub(crate) fn inconsistent_components() -> Self {
         KeyRejected("InconsistentComponents")
     }
@@ -205,19 +185,11 @@ impl KeyRejected {
 }
 
 #[cfg(feature = "std")]
-impl std::error::Error for KeyRejected {
-    fn cause(&self) -> Option<&dyn std::error::Error> {
-        None
-    }
-
-    fn description(&self) -> &str {
-        self.description_()
-    }
-}
+impl std::error::Error for KeyRejected {}
 
 impl core::fmt::Display for KeyRejected {
     fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
-        f.write_str(self.description_())
+        f.write_str(self.0)
     }
 }
 

tests/ed25519_tests.rs

@@ -121,7 +121,7 @@ fn test_ed25519_from_pkcs8_unchecked() {
                 (Ok(_), None) => (),
                 (Err(e), None) => panic!("Failed with error \"{}\", but expected to succeed", e),
                 (Ok(_), Some(e)) => panic!("Succeeded, but expected error \"{}\"", e),
-                (Err(actual), Some(expected)) => assert_eq!(actual.description_(), expected),
+                (Err(actual), Some(expected)) => assert_eq!(format!("{}", actual), expected),
             };
 
             Ok(())
@@ -143,7 +143,7 @@ fn test_ed25519_from_pkcs8() {
                 (Ok(_), None) => (),
                 (Err(e), None) => panic!("Failed with error \"{}\", but expected to succeed", e),
                 (Ok(_), Some(e)) => panic!("Succeeded, but expected error \"{}\"", e),
-                (Err(actual), Some(expected)) => assert_eq!(actual.description_(), expected),
+                (Err(actual), Some(expected)) => assert_eq!(format!("{}", actual), expected),
             };
 
             Ok(())