See section 4.3 "Smalltalk interactor mode" in (gst.info)Interactor::.
It provides a similar experience to the run-lisp interface you describe.
I do not describe all its features; please see that node.
After running M-x gst, I mostly rely on C-c f, which files in a file,
defaulting to the current. I occasionally use C-c c, which sends the
current method, when trying to fix test failures.
The same, together with prints.
There's also a crude gdb-like debugger, but it's not that much of a
performance boost.
Needless to say, unit tests are fundamental if debugging is a little
harder. Up to a while ago I was lazy and used a "test" method which had
to print only "true"s, but now I saw the light and many more GST
packages come with SUnit testsuites (more on that next week).
Paolo
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