From 076f7b5129a90485fa524b25fa2d2760f0620ce3 Mon Sep 17 00:00:00 2001
From: Georg Wiese <georgwiese@gmail.com>
Date: Wed, 14 Feb 2024 12:45:40 +0100
Subject: [PATCH] Improve error message in std::math::ff:inverse

---
 std/math/ff.asm | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/std/math/ff.asm b/std/math/ff.asm
index fcd9684f1..423ac53d2 100644
--- a/std/math/ff.asm
+++ b/std/math/ff.asm
@@ -2,7 +2,11 @@
 /// Assumes that `modulus` is prime, but does not check it.
 let inverse = |x, modulus|
     if x <= 0 || x >= modulus {
-        std::check::panic("Tried to compute the inverse of zero, of a negative number or a number outside the field.")
+        if x == 0 {
+            std::check::panic("Tried to compute the inverse of zero.")
+        } else {
+            std::check::panic("Tried to compute the inverse of a negative number or a number outside the field.")
+        }
     } else {
         reduce(extended_gcd(x, modulus)[0], modulus)
     };