--- a/rust/hg-core/Cargo.toml	Thu Oct 01 18:52:13 2020 +0200
+++ b/rust/hg-core/Cargo.toml	Tue Apr 21 11:28:48 2020 +0200
@@ -11,6 +11,7 @@
 [dependencies]
 byteorder = "1.3.4"
 hex = "0.4.2"
+im-rc = "15.0.*"
 lazy_static = "1.4.0"
 memchr = "2.3.3"
 rand = "0.7.3"