Explicitly pass interfaces in params as references #194
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This is my proposal for fixing #193.
With this change, interface parameters now have to be explicitly marked as references in the interface definitions. Look at
tests/ui/pass/param-refcount.rsfor an example. This also allows us to get rid ofParam. I think this makes it clearer and more consistent. In case you actually do want to pass ownership through a parameter, this is also possible by leaving the&away (not sure if anyone would actually need that).