From d2d9982c9a4b04a3f41e3f04bcd81fc756c8252b Mon Sep 17 00:00:00 2001
From: Gard Spreemann <gspr@nonempty.org>
Date: Sat, 9 Dec 2023 15:08:08 +0100
Subject: Well-definedness check for GCD

---
 08/src/stuff.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/08/src/stuff.rs b/08/src/stuff.rs
index 7e88605..e526858 100644
--- a/08/src/stuff.rs
+++ b/08/src/stuff.rs
@@ -45,6 +45,8 @@ pub fn gcd(mut m: u64, mut n: u64) -> u64 {
     if m < n {
         std::mem::swap(&mut m, &mut n);
     }
+
+    if m == 0 { panic!("gcd(0,0) is undefined"); }
     
     while n > 0 {
         let r: u64 = m % n;
-- 
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