--- a/rust/hg-core/src/dirstate.rs	Wed May 26 11:53:37 2021 +0200
+++ b/rust/hg-core/src/dirstate.rs	Tue May 25 09:20:30 2021 +0200
@@ -7,6 +7,7 @@
 
 use crate::dirstate_tree::on_disk::DirstateV2ParseError;
 use crate::errors::HgError;
+use crate::revlog::node::NULL_NODE;
 use crate::revlog::Node;
 use crate::utils::hg_path::{HgPath, HgPathBuf};
 use crate::FastHashMap;
@@ -25,6 +26,13 @@
     pub p2: Node,
 }
 
+impl DirstateParents {
+    pub const NULL: Self = Self {
+        p1: NULL_NODE,
+        p2: NULL_NODE,
+    };
+}
+
 /// The C implementation uses all signed types. This will be an issue
 /// either when 4GB+ source files are commonplace or in 2038, whichever
 /// comes first.