@abcdw @cwebber @wingo sounds interesting! over at spritely we have been behind on getting a real repl built for hoot but we will be starting on that soon, so hopefully some components of that will be of use to you.

one nit: Dave Thomas is the Wendy's guy, I'm Dave Thompson 😉

one comment: hoot does indeed have the power of guile's psyntax macro expander now, as well as a runtime module representation, so you shouldn't need to devote any of your dev time to that (excluding any bugs that could be lurking)

one question: what does "Nested evaluation and evaluation session switcher" mean in practice? I can make guesses but I'm not sure what you mean there.