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use std::collections::HashMap;
// Rust hash maps example

fn main() {
   let mut vars:HashMap<String, u32> = HashMap::new();
   vars.insert("foo".to_string(), 40);
   vars.insert("doo".to_string(), 40);
   match vars.get("soo") {
       Some(val) => println!("the value in dict is {}", val),
       None => panic!("Value not found!")
   }
}