% Destructors
Unlike constructors, destructors in Rust have a special status: they are added
by implementing Drop for a type, and they are automatically invoked as values
go out of scope.
[FIXME] This section needs to be expanded.
Destructors are executed on task failure, and in that context a failing destructor causes the program to abort.
Instead of failing in a destructor, provide a separate method for checking for
clean teardown, e.g. a close method, that returns a Result to signal
problems.
Similarly, destructors should not invoke blocking operations, which can make debugging much more difficult. Again, consider providing a separate method for preparing for an infallible, nonblocking teardown.