--- a/rust/hg-core/src/requirements.rs	Wed May 26 11:53:37 2021 +0200
+++ b/rust/hg-core/src/requirements.rs	Tue May 25 09:20:30 2021 +0200
@@ -82,6 +82,7 @@
     SPARSEREVLOG_REQUIREMENT,
     RELATIVE_SHARED_REQUIREMENT,
     REVLOG_COMPRESSION_ZSTD,
+    DIRSTATE_V2_REQUIREMENT,
     // As of this writing everything rhg does is read-only.
     // When it starts writing to the repository, it’ll need to either keep the
     // persistent nodemap up to date or remove this entry:
@@ -90,6 +91,8 @@
 
 // Copied from mercurial/requirements.py:
 
+pub(crate) const DIRSTATE_V2_REQUIREMENT: &str = "exp-dirstate-v2";
+
 /// When narrowing is finalized and no longer subject to format changes,
 /// we should move this to just "narrow" or similar.
 #[allow(unused)]