tor-dirmgr: impl AsRef<dyn Error> for Error

This allows use with tor_error::Report.

crates/tor-dirmgr/src/err.rs

@@ -1,5 +1,6 @@
 //! Declare an error type for the tor-dirmgr crate.
 
+use std::error::Error as StdError;
 use std::sync::Arc;
 
 use crate::DocSource;
@@ -155,6 +156,12 @@ impl From<tor_rtcompat::scheduler::SleepError> for Error {
     }
 }
 
+impl AsRef<dyn StdError + 'static> for Error {
+    fn as_ref(&self) -> &(dyn StdError + 'static) {
+        self
+    }
+}
+
 /// The effect that a given error has on our bootstrapping process
 #[derive(Copy, Clone, Debug)]
 pub(crate) enum BootstrapAction {