From 7c9e4e513c813a09bce5abdea0632da7374cf2bb Mon Sep 17 00:00:00 2001
From: Nathan Sobo <nathan@zed.dev>
Date: Wed, 29 Dec 2021 23:11:54 -0800
Subject: [PATCH] Provide an accurate panic message when translating points off
 the end of a line

Maybe we should fail more gracefully in this case, but I think we should at least make the message accurate and see how we do.
---
 crates/text/src/rope.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/crates/text/src/rope.rs b/crates/text/src/rope.rs
index 70399e15f544e4ecc77fef0efb19da2d84976071..89ce278de1a65a2f53658b188cf6452c7d973960 100644
--- a/crates/text/src/rope.rs
+++ b/crates/text/src/rope.rs
@@ -565,6 +565,12 @@ impl Chunk {
 
             if ch == '\n' {
                 point.row += 1;
+                if point.row > target.row {
+                    panic!(
+                        "point {:?} is beyond the end of a line with length {}",
+                        target, point.column
+                    );
+                }
                 point.column = 0;
             } else {
                 point.column += ch.len_utf8() as u32;