Bug fix on unloading loaded packages

[joshuamarie]

Hi. I've been working on a rather new tool to manage modules, built in Rust (this is the only tool that I know of). It's called carrier and here's the details on how to use it. Then, I tried the following new tool, and successfully installed modules throughout the system, though I acknowledged that the following tool I made is far far from perfect. Then, I modified {box}, where it is able to read "installed" .rmbx modules, also a success.

Let's put this aside, for now. When I am busy reverse engineering this package to sync with the tool I've been working on, I detected some kind of bug, where it throws an error when unloading R packages you loaded with box::use().

Error details:

box::unload(dplyr)
#> Error in `get0()`:
#> ! use of NULL environment is defunct
#> Hide Traceback
#>     ▆
#>  1. └─box::unload(dplyr)
#>  2.   └─box:::unload_mod(mod_ns, attr(mod, "info"))
#>  3.     └─box:::call_hook(mod_ns, ".on_unload", mod_ns)
#>  4.       └─box:::namespace_info(ns, "legacy", FALSE)
#>  5.         └─base::get0(which, ns$.__module__., inherits = FALSE, ifnotfound = default)

This occurs only for packages, not for the loaded local modules, or even on the "installed modules" I've been working on.

I don't know if you are aware this kind of problem and I don't know if this is a bug or a feature (if it is really intended for packages), but I believe this is kind of worth noting. Thus, I made a solution.