From 2db8cfd67d3177fddfa75c0b8024158fa699b33d Mon Sep 17 00:00:00 2001
From: Mario Rugiero <mrugiero@gmail.com>
Date: Wed, 4 Oct 2023 14:45:00 -0300
Subject: [PATCH] Return Option<u64> for u64 - Felt

---
 crates/stark-felt/src/lib.rs | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/crates/stark-felt/src/lib.rs b/crates/stark-felt/src/lib.rs
index 0093636..43ee8ae 100644
--- a/crates/stark-felt/src/lib.rs
+++ b/crates/stark-felt/src/lib.rs
@@ -556,18 +556,18 @@ mod arithmetic {
     /// Field subtraction. Never overflows/underflows.
     #[allow(clippy::suspicious_arithmetic_impl)]
     impl ops::Sub<Felt> for u64 {
-        type Output = Felt;
+        type Output = Option<u64>;
         fn sub(self, rhs: Felt) -> Self::Output {
-            rhs.neg() + self
+            self + &rhs.neg()
         }
     }
 
     /// Field subtraction. Never overflows/underflows.
     #[allow(clippy::suspicious_arithmetic_impl)]
     impl ops::Sub<&Felt> for u64 {
-        type Output = Felt;
+        type Output = Option<u64>;
         fn sub(self, rhs: &Felt) -> Self::Output {
-            rhs.neg() + self
+            self + &rhs.neg()
         }
     }