--- a/rust/hg-core/src/lib.rs	Thu Dec 12 16:24:43 2019 -0800
+++ b/rust/hg-core/src/lib.rs	Fri Mar 13 00:41:22 2020 +0100
@@ -103,6 +103,7 @@
     }
 }
 
+#[derive(Debug)]
 pub enum DirstateError {
     Parse(DirstateParseError),
     Pack(DirstatePackError),