Allow repl launched from code to be handled from within notebook?

The use case is the following: I have a long data massaging loop like

entries.each do 
  begin
    ... a lot of stuff that can go wrong
  rescue => e
   binding.pry
  end

if an error occur, I end up inside a pry session and I can properly inspect the data, error and eventually re-run the computation.

If I do this from within a notebook though the new pry session is launched in the underlying terminal, somewhat conflicting with the notebook logs.

It would be awesome to have the ability to launch a sub-repl from the notebook and interact with it.
Would this be possible, or it maybe already is, or does what I'm saying not even make sense?

Anyway, thanks for your work on iRuby, it's awesome.

Start by tracing how IRuby handles binding.pry or a repl launched from notebook code and where that session is sent, especially the underlying terminal. Determine whether an interactive sub-repl can be hosted in the notebook, and define done as a working notebook-launched session that does not conflict with notebook logs.