From 19a1221c4bb9df34bb0c14746fc5372d07d1c771 Mon Sep 17 00:00:00 2001
From: Arne Dußin
Date: Thu, 26 Nov 2020 14:57:39 +0100
Subject: Print polygon that makes the earcutting algo panic

---
 src/math/polygon/triangulate.rs | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

(limited to 'src/math/polygon/triangulate.rs')

diff --git a/src/math/polygon/triangulate.rs b/src/math/polygon/triangulate.rs
index 4c7d952..8a18cd7 100644
--- a/src/math/polygon/triangulate.rs
+++ b/src/math/polygon/triangulate.rs
@@ -75,10 +75,13 @@ where
      */
     while polygon.corners.len() > 3 {
         // Find the ear with the highest index.
-        let ear = flags
-            .iter()
-            .rposition(|&x| (x & FLAG_EAR) != 0)
-            .expect("Polygon has more than three vertices, but no ear.");
+        let ear = match flags.iter().rposition(|&x| (x & FLAG_EAR) != 0) {
+            Some(pos) => pos,
+            None => panic!(
+                "Polygon has more than three vertices, but no ear: {:?}",
+                polygon
+            ),
+        };
 
         // Add the ear's triangle to the list.
         {
-- 
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