Function parse 

pub fn parse(s: &str) -> Result<SpannedValue, Error>

Use this function to parse your json into a SpannedValue

use spanned_json_parse::parse;
use std::fs;

fn main() {
    let json = fs::read_to_string("path").unwrap();

    let parsed = parse(&json);

    println!("Parsed: {:#?}", parsed);
}