diff mercurial/revlogutils/revlogv0.py @ 47268:9d1a8829f959

revlog: signal which revlog index are compatible with Rust

Otherwise, Rust may treat python object like `cindex` object, leading to
trouble. The new attribute is an integer because I expect we might need a flag
field in the future.

As a start we get the rust code to raise a clear TypeError. We will use the
information in a smarter way in the next changesets.

Differential Revision: https://phab.mercurial-scm.org/D10665

--- a/mercurial/revlogutils/revlogv0.py	Tue May 04 11:19:48 2021 +0200
+++ b/mercurial/revlogutils/revlogv0.py	Tue May 04 14:16:26 2021 +0200
@@ -42,6 +42,7 @@
 
 
 class revlogoldindex(list):
+    rust_ext_compat = 0
     entry_size = INDEX_ENTRY_V0.size
     null_item = (
         0,