I admit some detailed how-to would be appreciated. I've been fiddling with Xcode, drag&dropping all that I could reasonably think of, added my local package to the "Link Binary with Libraries" build phase, etc, without any success so far.
The goal: be able to
import Product from AppDelegate.swift without "No such module 'Product'" error.
Why? I'm trying to reduce a bug in Xcode 11.2 beta 2, and I'm testing the hypothesis that the bug only happens when some code is imported from a swift package.
Edit: see solution in the next message.