Add example for integer parsing to digit1

src/character/complete.rs

@@ -414,6 +414,24 @@ where
 /// assert_eq!(parser("c1"), Err(Err::Error(Error::new("c1", ErrorKind::Digit))));
 /// assert_eq!(parser(""), Err(Err::Error(Error::new("", ErrorKind::Digit))));
 /// ```
+/// 
+/// ## Parsing an integer
+/// You can use `digit1` in combination with [`map_res`] to parse an integer:
+/// 
+/// ```
+/// # use nom::{Err, error::{Error, ErrorKind}, IResult, Needed};
+/// # use nom::combinator::map_res;
+/// # use nom::character::complete::digit1;
+/// fn parser(input: &str) -> IResult<&str, u32> {
+///   map_res(digit1, str::parse)(input)
+/// }
+/// 
+/// assert_eq!(parser("416"), Ok(("", 416)));
+/// assert_eq!(parser("12b"), Ok(("b", 12)));
+/// assert!(parser("b").is_err());
+/// ```
+/// 
+/// [`map_res`]: crate::combinator::map_res
 pub fn digit1<T, E: ParseError<T>>(input: T) -> IResult<T, T, E>
 where
   T: InputTakeAtPosition,