From 407b8413123eaa847643ceea70bed6800ca83e87 Mon Sep 17 00:00:00 2001
From: Luca Barbato <lu_zero@gentoo.org>
Date: Sat, 20 Jul 2019 12:10:26 -0400
Subject: [PATCH] Make ilog64 const

leading_zeroes and this kind of functions are const-ready since 1.34.0
We neeed https://github.com/rust-lang/rust/issues/57349 to constantize
further.
---
 src/rate.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/rate.rs b/src/rate.rs
index a7fce0f4f5..0116e0464f 100644
--- a/src/rate.rs
+++ b/src/rate.rs
@@ -86,7 +86,7 @@ const DQP_Q57: &[i64; FRAME_NSUBTYPES] = &[
 // This is the number of bits that would be required to represent v in two's
 //  complement notation with all of the leading zeros stripped.
 // TODO: Mark const once leading_zeros() as a constant function stabilizes.
-fn ilog64(v: i64) -> i32 {
+const fn ilog64(v: i64) -> i32 {
   64 - (v.leading_zeros() as i32)
 }