trait_impl_inside_function.rs

use std::fmt;
use std::fmt::{Display, Formatter};

struct S {
  x: i64,
}

fn define_impl() {
  impl Display for S {
    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
      write!(f, "S {}", self.x)
    }
  }
}

fn main() {
  // function call is not required to bring the defined trait implementation into the scope!
  let s = S { x: -298 };
  println!("s = {}", s);
}