From 036f1f7cec2664310dda7140af1861ab0da1ee8d Mon Sep 17 00:00:00 2001
From: Adam Nielsen <malvineous@shikadi.net>
Date: Sun, 23 Feb 2020 11:27:38 +1000
Subject: [PATCH] Make sequences wrap around to avoid overflows

Instead of aborting with an `attempt to add with overflow` error, wrap the sequence around so that it goes back to 0 once it has reached the maximum value for the integer type.  Fixes #437.
---
 core/src/util/mod.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/src/util/mod.rs b/core/src/util/mod.rs
index 5c1e50f5..800e04e1 100644
--- a/core/src/util/mod.rs
+++ b/core/src/util/mod.rs
@@ -38,7 +38,7 @@ pub trait Seq {
 macro_rules! impl_seq {
     ($($ty:ty)*) => { $(
         impl Seq for $ty {
-            fn next(&self) -> Self { *self + 1 }
+            fn next(&self) -> Self { (*self).wrapping_add(1) }
         }
     )* }
 }