Hello dev. team,
I'm glad you came back after 4 months of absence, so I greet you with my first in list missing feature request
I think It's really useful for creation of inline repl in editor for any language supporting this feature (such as clojure, python etc).
Also it may have other use such as error reporting, common hinting or anything else I may not know.
How it looks in LightTable (using custom color scheme)