From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sun, 23 Aug 2020 21:46:28 +0000 (+0100)
Subject: for revert - error_display - can just use {:?}
X-Git-Tag: otter-0.2.0~1063
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=commitdiff_plain;h=75d063d87f67c161ad5fcbf9eb5955dfed0d1611;p=otter.git

for revert - error_display - can just use {:?}
---

diff --git a/src/lib.rs b/src/lib.rs
index f1d151b3..dc7e63c4 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,7 @@
 
 #![feature(proc_macro_hygiene, decl_macro)]
 #![feature(slice_strip)]
+#![feature(error_iter)]
 
 #![allow(clippy::redundant_closure_call)]
 
diff --git a/src/utils.rs b/src/utils.rs
index 55117cb8..878d5d0a 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -6,3 +6,9 @@ pub trait OrdExt : Ord + Sized {
 }
 impl<T> OrdExt for T where T : Ord + Sized {
 }
+
+pub fn error_display<E: AsRef<dyn std::error::Error + 'static>>(err: &E) {
+  for (e,i) in err.as_ref().chain().zip(0..) {
+    eprintln!("error {:2}: {}", i,e);
+  }
+}