The drop function being talked about here is the one I pointed to, not the one you pointed to. The Drop trait is built into the language (as a lang item), std::mem::drop is just a regular old function.

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codedokode 4 days ago | parent [-]

The drop that you mention doesn't free memory, as I understand, it is called before actually destroying object's memory.

	▲	steveklabnik 4 days ago \| parent [-]
		Not inherently, sure. But ultimately this is far afield of what I was trying to say, which is that the signature being discussed of being changed from &mut T to &owned T is the one from the Drop trait. That’s it.