rust: add a ObjectID struct

We'd like to be able to write some Rust code that can work with object
IDs.  Add a structure here that's identical to struct object_id in C,
for easy use in sharing across the FFI boundary.  We will use this
structure in several places in hot paths, such as index-pack or
pack-objects when converting between algorithms, so prioritize efficient
interchange over a more idiomatic Rust approach.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/lib.rs b/src/lib.rs
index 9da70d8b57..cf7c962509 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1 +1,2 @@
+pub mod hash;
 pub mod varint;