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Issue Description:

Attached is the e-mail thread explaining the scenario, but here are the samples from the e-mail:

We tried https://swift.org/blog/swiftpm-repl-support/ out, but that seems to only allow me to get the Swift Package working in an interactive interpreter.

We're hoping to get this to work with getting the compile to work, and then run a script with the compiled Swift Package in the included path.

An example of what I would’ve guessed from the Swift command was
$ swift run —repl main.swift

What I did to test this was to do a clone of the Swift Package I want locally, run:
$ swift run —repl
In the source directory of the package. Followed by copying my script (that works when I do this all in Xcode and compile) to the directory where I ran the last command. Then I ran:
$ swift run —repl main.swift
But it opens up an interactive terminal for me instead of running my script.

The end goal would be to run the script with an environment that can import the downloaded and compiled package source.