--- a/rust/hg-core/src/dirstate/entry.rs	Sun Jun 12 16:04:57 2022 +0100
+++ b/rust/hg-core/src/dirstate/entry.rs	Wed May 18 09:50:39 2022 +0100
@@ -83,7 +83,7 @@
                 second_ambiguous,
             })
         } else {
-            Err(DirstateV2ParseError)
+            Err(DirstateV2ParseError::new("when reading datetime"))
         }
     }