rust-polimorfismo-6

Compiling playground v0.0.1 (/playground)
error[E0782]: trait objects must include the `dyn` keyword
  --> src/main.rs:22:22
   |
22 | fn write(media: &mut Write, text: &str) {
   |                      ^^^^^
   |
help: add `dyn` keyword before this trait
   |
22 | fn write(media: &mut dyn Write, text: &str) {
   |                      +++

For more information about this error, try `rustc --explain E0782`.
error: could not compile `playground` due to previous error