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Rust does not allow a generic type parameter in a function parameter. At least not yet.
I need to do that, though, so here's a solution involving Box, RefCell, and run-time borrow().
It works, but is a bit clunky. Suggestions?

I tried using just RefCell, which, like Box, takes ownership of its content. But RefCell<&dyn mut Any> doesn't work.

(Use case: passing a mutable link to a MySQL connection into something that uses it repeatedly.)

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