I just made sure to update to the latest (3.1.0) exercism, and tried to execute the ‘swift package’ command listed above. First, it gives me a warning that Xcode can open and build Swift Packages directly, and then it gave me this error:
Exercism/swift/leap/Package.swift:3:8: error: no such module 'PackageDescription'
hmmm, well what I do is that I download the exercise, solve the exercise and then I run swift test and that builds the exercise. Since you shouldn’t have to build the exercise before you actually have to test. But again I am not on a mac so it may be different