diff --git a/src/lib.rs b/src/lib.rs
index 760bda8..27148c2 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -156,18 +156,19 @@ where
 
 fn one_or_more<P, I, O>(parser: P) -> impl Parser<I, Vec<O>, I>
 where
-    P: Parser<I, O, I>,
-    I: Copy,
+    P: Parser<I, O, I> + 'static,
+    I: Copy + 'static,
+    O: 'static,
 {
     let parser = std::rc::Rc::new(parser);
-    map(
-        seq(parser.clone(), zero_or_more(parser)),
-        |(first, rest)| {
+    parser
+        .clone()
+        .then(zero_or_more(parser))
+        .map(|(first, rest)| {
             let mut output = vec![first];
             output.extend(rest.into_iter());
             output
-        },
-    )
+        })
 }
 
 /// Parses a standard identifier in a programming language