error[E0040]: explicit use of destructor method
  --> $DIR/E0040.rs:16:7
   |
LL |     x.drop();
   |       ^^^^ explicit destructor calls not allowed
   |
help: consider using `drop` function
   |
LL |     drop(x);
   |     +++++ ~

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0040`.