diff --git a/dev-rust/const_fn/Manifest b/dev-rust/const_fn/Manifest
new file mode 100644
index 0000000..b2142aa
--- /dev/null
+++ b/dev-rust/const_fn/Manifest
@@ -0,0 +1 @@
+DIST const_fn-0.4.3.crate 15120 BLAKE2B aa2b97dbcf8dfb92f0b17f0125fb4a12f109e87fd93818fb148ec35ff405bd58609ccbdca7f9985a707d00cf92e345ef07c8fd736bfd735b76753a34a7a34966 SHA512 4c2d6c8e1bf6823f76c4572b659bb82af6b7cec2547ae132749d2443bd92cd8dfe96eeed6f704f30f7f407662b14a5d12808665a321af42cfcbc979560cb70fb
diff --git a/dev-rust/const_fn/const_fn-0.4.3.ebuild b/dev-rust/const_fn/const_fn-0.4.3.ebuild
new file mode 100644
index 0000000..a0246cc
--- /dev/null
+++ b/dev-rust/const_fn/const_fn-0.4.3.ebuild
@@ -0,0 +1,14 @@
+# Copyright 2020 The Chromium OS Authors. All rights reserved.
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI="7"
+
+inherit cros-rust
+
+DESCRIPTION="An attribute for easy generation of const functions with conditional compilations."
+HOMEPAGE="https://github.com/taiki-e/const_fn"
+SRC_URI="https://crates.io/api/v1/crates/${PN}/${PV}/download -> ${P}.crate"
+
+LICENSE="|| ( MIT Apache-2.0 )"
+SLOT="${PV}/${PR}"
+KEYWORDS="*"