diff -r f6d0a89fdf80 -r 9b2a51b2c36a rust/hg-core/src/dirstate_tree/dirstate_map.rs
--- a/rust/hg-core/src/dirstate_tree/dirstate_map.rs	Wed Sep 22 18:42:00 2021 +0200
+++ b/rust/hg-core/src/dirstate_tree/dirstate_map.rs	Wed Sep 22 18:56:58 2021 +0200
@@ -758,10 +758,13 @@
         self.nodes_with_copy_source_count = 0;
     }
 
-    fn set_entry(&mut self, filename: &HgPath, entry: DirstateEntry) {
-        let node =
-            self.get_or_insert(&filename).expect("no parse error in v1");
-        node.data = NodeData::Entry(entry);
+    fn set_entry(
+        &mut self,
+        filename: &HgPath,
+        entry: DirstateEntry,
+    ) -> Result<(), DirstateV2ParseError> {
+        self.get_or_insert(&filename)?.data = NodeData::Entry(entry);
+        Ok(())
     }
 
     fn add_file(