From d4e1ec339e022ffd5073873ac0bc64e3c095d064 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bla=C5=BE=20Hrastnik?= <blaz@mxxn.io>
Date: Mon, 28 Jun 2021 14:50:35 +0900
Subject: [PATCH] Don't crash if diagnostics span past EOF

---
 helix-core/src/syntax.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/helix-core/src/syntax.rs b/helix-core/src/syntax.rs
index d03ca6bf7..c556a3477 100644
--- a/helix-core/src/syntax.rs
+++ b/helix-core/src/syntax.rs
@@ -1765,6 +1765,11 @@ impl<I: Iterator<Item = HighlightEvent>> Iterator for Merge<I> {
                 self.next_event = self.iter.next();
                 Some(event)
             }
+            // can happen if deleting and cursor at EOF, and diagnostic reaches past the end
+            (None, Some((span, range))) => {
+                self.next_span = None;
+                None
+            }
             (None, None) => None,
             e => unreachable!("{:?}", e),
         }