From b636080f6738dd390fd8a92df5920f5b0df431d0 Mon Sep 17 00:00:00 2001
From: Edwin Cheng <edwin0cheng@gmail.com>
Date: Sat, 3 Apr 2021 11:20:16 +0800
Subject: Fix joinLines panic if run on the empty last line

---
 crates/ide/src/join_lines.rs | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

(limited to 'crates/ide/src/join_lines.rs')

diff --git a/crates/ide/src/join_lines.rs b/crates/ide/src/join_lines.rs
index d584190f7..fe2a349e6 100644
--- a/crates/ide/src/join_lines.rs
+++ b/crates/ide/src/join_lines.rs
@@ -88,8 +88,11 @@ fn remove_newline(edit: &mut TextEditBuilder, token: &SyntaxToken, offset: TextS
     }
 
     // The node is between two other nodes
-    let prev = token.prev_sibling_or_token().unwrap();
-    let next = token.next_sibling_or_token().unwrap();
+    let (prev, next) = match (token.prev_sibling_or_token(), token.next_sibling_or_token()) {
+        (Some(prev), Some(next)) => (prev, next),
+        _ => return,
+    };
+
     if is_trailing_comma(prev.kind(), next.kind()) {
         // Removes: trailing comma, newline (incl. surrounding whitespace)
         edit.delete(TextRange::new(prev.text_range().start(), token.text_range().end()));
@@ -826,6 +829,17 @@ fn main() {
 $0hello world
 ";
 }
+"#,
+        );
+    }
+    #[test]
+    fn join_last_line_empty() {
+        check_join_lines(
+            r#"
+fn main() {$0}
+"#,
+            r#"
+fn main() {$0}
 "#,
         );
     }
-- 
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