Wrap the input.

src/main.rs

@@ -2,12 +2,20 @@ use nom::bytes::complete::tag;
 
 fn main() {
     let input = "this is my test input".to_owned();
+    let wrapped_input = WrappedInput::new(input.as_str());
 
-    let output = tag::<_, _, (_, nom::error::ErrorKind)>("this")(input.as_str()).unwrap();
+    let output = tag::<_, _, (_, nom::error::ErrorKind)>("this")(wrapped_input).unwrap();
 
     println!("{:#?}", output);
 }
 
+#[derive(Debug)]
 struct WrappedInput<'s> {
     contents: &'s str,
 }
+
+impl<'s> WrappedInput<'s> {
+    pub fn new(input: &'s str) -> Self {
+        WrappedInput { contents: input }
+    }
+}