From a1d09806c815e76a6349706a5ce1de75ce1f0816 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Tue, 1 Jun 2021 01:26:15 +0100
Subject: [PATCH] utils: error end_process: Do not print duplicate messages

Sometimes we use thiserror to put {0} of an inner error in our Display
impl.  If that happens, just skip the repetition.

This is a slight bodge.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 src/utils.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/utils.rs b/src/utils.rs
index 0daef636..9c73675a 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -659,13 +659,16 @@ impl anyhow::Error {
       }
     }
     let mut sol: Sol = default();
+    let mut printed = String::new();
     for e in self.chain() {
       let s = e.to_string();
+      if printed.contains(&s) { continue }
       let long = s.len() > 80;
       if long && sol.any { sol.nl() }
       sol.head();
-      eprint!(": {}", s);
+      eprint!(": {}", &s);
       if long { sol.nl() }
+      printed = s;
     }
     sol.nl();
     assert!(estatus > 0);
-- 
2.30.2