IIRC, Edit and Continue in Visual Studio products (I believe it was there in VC++ as well as VB when it was first introduced) was a feature in at least one Lisp version (maybe Franz Lisp or another popular commercial Lisp product at the time) - before it was introduced in VS. I remember this because I had been trying out either or both of those Lisps at the time, and soon after that, I read about the Edit and Continue feature in the next-released VS product. I think I emailed about it to a friend at the time.