$ cargo run
   Compiling drop-example v0.1.0 (file:///projects/drop-example)
error[E0040]: explicit use of destructor method
  --> src/main.rs:16:7
   |
16 |     c.drop();
   |       ^^^^
   |       |
   |       explicit destructor calls not allowed
   |       help: consider using `drop` function: `drop(c)`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0040`.
error: could not compile `drop-example`

To learn more, run the command again with --verbose.
