I'm not sure about how to do this with the DrRacket debugger, but you can use `debug-repl`[1] from the `debug` package to basically set a breakpoint that opens a REPL you can use to inspect variables in. This works in both DrRacket and regular command line racket.
[1] http://docs.racket-lang.org/debug/index.html?q=debug#%28form._%28%28lib._debug%2Frepl..rkt%29._debug-repl%29%29 -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.