fn fmt(&self, f: &mut Formatter) -> fmt::Result {
    // `write!` is like `format!`, but it will write the formatted string
    // into a buffer (the first argument)
    write!(
      f,
      "Hexagon<x: {}, y: {}, radius: {}>",
      self.x, self.y, self.radius
    )
  }
// `f` is a buffer, this method must write the formatted string into it
`f` is a buffer, this method must write the formatted string into it
` f ` is a buffer this method must write the formatted string into it
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
    // `write!` is like `format!`, but it will write the formatted string
    // into a buffer (the first argument)
    write!(
      f,
      "Hexagon<x: {}, y: {}, radius: {}>",
      self.x, self.y, self.radius
    )
  }
fn fmt ( & self , f : & mut Formatter ) -> fmt :: Result { // `write!` is like `format!`, but it will write the formatted string // into a buffer (the first argument) write ! ( f " " self x self y self radius ) }
`f` is a buffer, this method must write the formatted string into it
` f ` is a buffer this method must write the formatted string into it
&self
f
&mut Formatter