error[E0716]: temporary value dropped while borrowed
  --> $DIR/borrowck-ref-into-rvalue.rs:4:11
   |
LL |     match Some("Hello".to_string()) {
   |           ^^^^^^^^^^^^^^^^^^^^^^^^^ creates a temporary value which is freed while still in use
...
LL |     }
   |     - temporary value is freed at the end of this statement
LL |     println!("{}", *msg);
   |                    ---- borrow later used here
   |
help: consider using a `let` binding to create a longer lived value
   |
LL ~     let binding = Some("Hello".to_string());
LL ~     match binding {
   |

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0716`.