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.

1 files changed, 2 insertions, 3 deletions

diff --git a/ffi/src/error.rs b/ffi/src/error.rs
index 331bad04..26940111 100644
--- a/ffi/src/error.rs
+++ b/ffi/src/error.rs
@@ -1,6 +1,5 @@
 //! Maps various errors to status codes.
 
-use failure;
 use std::io;
 
 extern crate sequoia_openpgp as openpgp;
@@ -10,11 +9,11 @@ pub use crate::openpgp::error::Status;
 pub(crate) use crate::openpgp::error::Error;
 
 trait FromSequoiaError<'a> {
-    fn from_sequoia_error(_: &'a failure::Error) -> Status;
+    fn from_sequoia_error(_: &'a anyhow::Error) -> Status;
 }
 
 impl<'a> FromSequoiaError<'a> for Status {
-    fn from_sequoia_error(e: &'a failure::Error) -> Self {
+    fn from_sequoia_error(e: &'a anyhow::Error) -> Self {
         if let Some(e) = e.downcast_ref::<core::Error>() {
             return match e {
                 &core::Error::NetworkPolicyViolation(_) =>