From 553251761fdbc85229a29da5b9b9ae07719e176a Mon Sep 17 00:00:00 2001
From: Eric Long <i@hack3r.moe>
Date: Fri, 1 Jul 2022 01:59:40 +0800
Subject: [PATCH] Add `MultiValue::get` & add clear error in `Index`

---
 src/value.rs | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/value.rs b/src/value.rs
index 1288ca0..b77f2bc 100644
--- a/src/value.rs
+++ b/src/value.rs
@@ -248,7 +248,15 @@ impl<'lua> Index<usize> for MultiValue<'lua> {
 
     #[inline]
     fn index(&self, index: usize) -> &Self::Output {
-        &self.0[self.0.len() - index - 1]
+        if let Some(result) = self.get(index) {
+            result
+        } else {
+            panic!(
+                "index out of bounds: the len is {} but the index is {}",
+                self.len(),
+                index
+            )
+        }
     }
 }
 
@@ -266,6 +274,11 @@ impl<'lua> MultiValue<'lua> {
         v
     }
 
+    #[inline]
+    pub fn get(&self, index: usize) -> Option<&Value<'lua>> {
+        self.0.get(self.0.len() - index - 1)
+    }
+
     #[inline]
     pub(crate) fn reserve(&mut self, size: usize) {
         self.0.reserve(size);