openpgp: Use non_exhaustive attribute.

  - Fixes #563
  - With an MSRV >= 1.40.0, we can use #[non_exhaustive], as mentioned
    in #406.
  - This is also a clippy lint:
    https://rust-lang.github.io/rust-clippy/master/index.html#manual_non_exhaustive

2 files changed, 2 insertions, 2 deletions

diff --git a/ipc/src/keygrip.rs b/ipc/src/keygrip.rs
index c6d01eeb..148c11d7 100644
--- a/ipc/src/keygrip.rs
+++ b/ipc/src/keygrip.rs
@@ -174,7 +174,7 @@ impl Keygrip {
                     "Keygrip not defined for this kind of public key".into())
                            .into()),
 
-            __Nonexhaustive => unreachable!(),
+            &_ => unreachable!(), // Ciphertext is non-exhaustive.
         }
 
         let mut digest = [0; 20];
diff --git a/ipc/src/sexp.rs b/ipc/src/sexp.rs
index ee376f61..1ca36a04 100644
--- a/ipc/src/sexp.rs
+++ b/ipc/src/sexp.rs
@@ -294,7 +294,7 @@ impl TryFrom<&mpi::Ciphertext> for Sexp {
                     format!("Don't know how to convert {:?}", ciphertext))
                     .into()),
 
-            __Nonexhaustive => unreachable!(),
+            &_ => unreachable!(), // Ciphertext is non-exhaustive.
         }
     }
 }