From 60f8e11769864befc1f116f5f2896cdbf16609f1 Mon Sep 17 00:00:00 2001
From: John Turner <jturner.usa@gmail.com>
Date: Thu, 23 Oct 2025 00:28:56 -0400
Subject: clone iterator in OneOf

---
 src/lib.rs | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

(limited to 'src/lib.rs')

diff --git a/src/lib.rs b/src/lib.rs
index 83ead73..1de814c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,4 +1,11 @@
-use core::{cmp::PartialEq, fmt, iter::Iterator, marker::Sized, ops::Range};
+use core::{
+    clone::Clone,
+    cmp::PartialEq,
+    fmt,
+    iter::{IntoIterator, Iterator},
+    marker::Sized,
+    ops::Range,
+};
 
 use crate::{
     input::{Character, Input, InputIter},
@@ -427,7 +434,7 @@ impl<I, It> Parser<I> for OneOf<It>
 where
     I: Input,
     I::Item: PartialEq<It::Item>,
-    It: Iterator,
+    It: IntoIterator + Clone,
 {
     type Output = I::Item;
 
@@ -437,9 +444,13 @@ where
     ) -> ParserResult<I, Self::Output, OM, EM> {
         Tracer::trace("oneof", it.clone());
 
+        let start = it.clone();
+
         match it.next() {
-            Some((_, item)) if self.it.any(|i| item == i) => Ok((it, OM::bind(|| item))),
-            _ => Err(EM::bind(|| it)),
+            Some((_, item)) if self.it.clone().into_iter().any(|i| item == i) => {
+                Ok((it, OM::bind(|| item)))
+            }
+            _ => Err(EM::bind(|| start)),
         }
     }
 }
@@ -448,7 +459,7 @@ pub fn one_of<I, It>(it: It) -> impl Parser<I, Output = I::Item>
 where
     I: Input,
     I::Item: PartialEq<It::Item>,
-    It: Iterator,
+    It: IntoIterator + Clone,
 {
     OneOf { it }
 }
-- 
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