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

1 files changed, 1 insertions, 4 deletions

diff --git a/openpgp/src/lib.rs b/openpgp/src/lib.rs
index d71bb483..bb143d2f 100644
--- a/openpgp/src/lib.rs
+++ b/openpgp/src/lib.rs
@@ -177,6 +177,7 @@ pub type Result<T> = ::std::result::Result<T, anyhow::Error>;
 ///
 /// Note: This enum cannot be exhaustively matched to allow future
 /// extensions.
+#[non_exhaustive]
 #[derive(thiserror::Error, Debug, Clone, PartialEq, Eq)]
 pub enum Error {
     /// Invalid argument.
@@ -296,8 +297,4 @@ pub enum Error {
             .1.as_ref().map(|t| format!(" since {}", crate::fmt::time(t)))
             .unwrap_or("".into()))]
     PolicyViolation(String, Option<std::time::SystemTime>),
-
-    /// This marks this enum as non-exhaustive.  Do not use this
-    /// variant.
-    #[doc(hidden)] #[error("__Nonexhaustive")] __Nonexhaustive,
 }