From 3cb8be3ab3d58f59d3aa38bf40ccb744788a3050 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sun, 12 Jul 2020 12:59:57 +0100
Subject: [PATCH] display as debug

---
 src/error.rs  | 6 ++++++
 src/pieces.rs | 6 +-----
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/error.rs b/src/error.rs
index 454ad0f0..e52953b5 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -80,5 +80,11 @@ impl IdForById for PieceId {
 #[macro_export]
 macro_rules! display_as_debug {
   {$x:ty} => {
+    impl Display for $x {
+      fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+        <Self as Debug>::fmt(self, f)
+      }
+    }
   }
 }
+pub use crate::display_as_debug;
diff --git a/src/pieces.rs b/src/pieces.rs
index 8173a656..17e2acc2 100644
--- a/src/pieces.rs
+++ b/src/pieces.rs
@@ -22,14 +22,10 @@ pub enum SVGProcessError {
   BadNumber,
   WriteFail,
 }
+display_as_debug!{SVGProcessError}
 impl From<fmt::Error> for SVGProcessError {
   fn from(_: fmt::Error) -> Self { SVGProcessError::WriteFail }
 }
-impl Display for SVGProcessError {
-  fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
-    <Self as Debug>::fmt(self, f)
-  }
-}
 
 #[throws(SVGProcessError)]
 pub fn svg_rescale_path(input: &str, scale: f64) -> String {
-- 
2.30.2