From 2dbc60f3e071f8516da5b694411c0b5883a79650 Mon Sep 17 00:00:00 2001
From: Dominik Maier <domenukk@gmail.com>
Date: Wed, 28 Oct 2020 16:17:52 +0100
Subject: [PATCH] fixed next_pow2 for 0

---
 src/utils.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/utils.rs b/src/utils.rs
index a3ffff9cb3..36da82184c 100644
--- a/src/utils.rs
+++ b/src/utils.rs
@@ -89,13 +89,13 @@ impl Xoshiro256StarRand {
 
 /// Get the next higher power of two
 pub fn next_pow2(val: u64) -> u64 {
-    let mut out: u64 = val.wrapping_sub(1);
+    let mut out = val.wrapping_sub(1);
     out |= out >> 1;
     out |= out >> 2;
     out |= out >> 4;
     out |= out >> 8;
     out |= out >> 16;
-    return out + 1;
+    out.wrapping_add(1)
 }
 
 #[cfg(test)]
@@ -119,5 +119,6 @@ mod tests {
         assert_eq!(next_pow2(2), 2);
         assert_eq!(next_pow2(3), 4);
         assert_eq!(next_pow2(1000), 1024);
+        assert_eq!(next_pow2(u32::MAX as u64), (u32::MAX as u64) + 1);
     }
 }