[naasking]

Could be a cool feature, but I wouldn't say "first". Been done in C for years:

* Safe and Automatic Live Update for Operating Systems, https://www.cs.vu.nl/~giuffrida/papers/asplos-2013.pdf

* Automating Live Update for Generic Server Programs, https://www.cs.vu.nl/~giuffrida/papers/lu_tse16.pdf

And I'm sure hot code reloading has been done in Forth for decades.