Switch from failure to anyhow.

  - Use the anyhow crate instead of failure to implement the dynamic
    side of our error handling.  anyhow::Error derefs to dyn
    std::error::Error, allowing better interoperability with other
    stdlib-based error handling libraries.

  - Fixes #444.

2 files changed, 3 insertions, 5 deletions

diff --git a/openpgp/examples/decrypt-with.rs b/openpgp/examples/decrypt-with.rs
index 4889d29b..5de69863 100644
--- a/openpgp/examples/decrypt-with.rs
+++ b/openpgp/examples/decrypt-with.rs
@@ -5,7 +5,6 @@ use std::collections::HashMap;
 use std::env;
 use std::io;
 
-extern crate failure;
 extern crate sequoia_openpgp as openpgp;
 
 use crate::openpgp::cert::prelude::*;
diff --git a/openpgp/examples/generate-sign-verify.rs b/openpgp/examples/generate-sign-verify.rs
index 0e9ab2d1..294fd69d 100644
--- a/openpgp/examples/generate-sign-verify.rs
+++ b/openpgp/examples/generate-sign-verify.rs
@@ -2,7 +2,6 @@
 
 use std::io::{self, Write};
 
-extern crate failure;
 extern crate sequoia_openpgp as openpgp;
 use crate::openpgp::cert::prelude::*;
 use crate::openpgp::serialize::stream::*;
@@ -119,10 +118,10 @@ impl<'a> VerificationHelper for Helper<'a> {
                         Some(Err(e)) =>
                             return Err(openpgp::Error::from(e).into()),
                         None =>
-                            return Err(failure::err_msg("No signature")),
+                            return Err(anyhow::anyhow!("No signature")),
                     }
                 },
-                _ => return Err(failure::err_msg(
+                _ => return Err(anyhow::anyhow!(
                     "Unexpected message structure")),
             }
         }
@@ -130,7 +129,7 @@ impl<'a> VerificationHelper for Helper<'a> {
         if good {
             Ok(()) // Good signature.
         } else {
-            Err(failure::err_msg("Signature verification failed"))
+            Err(anyhow::anyhow!("Signature verification failed"))
         }
     }
 }