Yes, certainly, our current REPL is somewhat inflexible, but the (fully functional, but not something we want to drop in last minute - probably next release cycle) version of the REPL in the REPL.jl package as well as the IJulia Notebook already do some of this for e.g. completion of fields of a composite type.

If you're interested you can see the code for that completer here: https://github.com/loladiro/REPLCompletions.jl/blob/master/s...