From f1e83eb81879412e1de9898238ba58289bb6cb24 Mon Sep 17 00:00:00 2001
From: Robin Krahl <robin.krahl@ireas.org>
Date: Wed, 8 Jul 2020 22:58:41 +0200
Subject: Ensure Error trait implementations

The anyhow crate requires that error types are error::Error, Send, Sync
and 'static.  This patch implements a simple static assertion that our
Error type implements these traits.
---
 src/error.rs | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/src/error.rs b/src/error.rs
index 995741b..1aa1793 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -267,3 +267,22 @@ impl fmt::Display for LibraryError {
         })
     }
 }
+
+// build our own static assertion that Error implements error::Error, Send, Sync, 'static
+
+struct Helper<T>(T);
+
+trait Assert {
+    fn assert() -> bool;
+}
+
+impl<T: error::Error + Send + Sync + 'static> Assert for Helper<T> {
+    fn assert() -> bool {
+        true
+    }
+}
+
+#[allow(unused)]
+fn assert_error_impl() {
+    let _ = Helper::<Error>::assert();
+}
-- 
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