rust: Don't crash when we can't write debug.txt

1 files changed, 5 insertions, 3 deletions

diff --git a/rust/src/main.rs b/rust/src/main.rs
index 8dc5163..4b79973 100644
--- a/rust/src/main.rs
+++ b/rust/src/main.rs
@@ -21,14 +21,16 @@ use crate::error::IntoIOError;
 mod editor;
 mod error;
 
-static DEBUG_FILE: Lazy<Mutex<File>> = Lazy::new(|| {
+static DEBUG_FILE: Lazy<Mutex<Option<File>>> = Lazy::new(|| {
     Mutex::new(
         OpenOptions::new().write(true).truncate(true).create(true)
-            .open("debug.txt").unwrap())
+            .open("debug.txt").ok())
 });
 
 fn debug_write(s: &str) {
-    writeln!(DEBUG_FILE.lock().unwrap(), "{}", s).unwrap();
+    let file = DEBUG_FILE.lock().unwrap();
+    file.as_ref()
+        .map(|mut file| writeln!(file, "{}", s).unwrap());
 }
 
 macro_rules! debug {