Fixes rust-lang#66898 When we are unable to resolve a reference to `self`, we current assume that the containing function doesn't have a `self` parameter, and emit an error message accordingly. However, if the reference to `self` was created by a macro invocation, then resolution will correctly fail, due to hygiene. In this case, we don't want to tell the user that the containing fuction doesn't have a 'self' paramter if it actually has one. This PR checks for the precense of a 'self' parameter, and adjusts the error message we emit accordingly. TODO: The exact error message we emit could probably be improved. Should we explicitly mention hygiene?

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