From 4ddacc707d5a9afd42ae598ceeb00a9285d8cd17 Mon Sep 17 00:00:00 2001
From: Mark Thom <markjordanthom@gmail.com>
Date: Sat, 29 Jan 2022 12:50:09 -0700
Subject: [PATCH] add range check to arg/3 (#1250)

---
 src/machine/machine_state_impl.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/machine/machine_state_impl.rs b/src/machine/machine_state_impl.rs
index 373f8704..50b5144c 100644
--- a/src/machine/machine_state_impl.rs
+++ b/src/machine/machine_state_impl.rs
@@ -2080,7 +2080,7 @@ impl MachineState {
 
                 let n = match n {
                     Number::Fixnum(n) => n.get_num() as usize,
-                    Number::Integer(n) => n.to_usize().unwrap(),
+                    Number::Integer(n) if *n >= 0 && *n <= std::usize::MAX => n.to_usize().unwrap(),
                     _ => {
                         self.fail = true;
                         return Ok(());
-- 
2.54.0