Any chance that could make it in as a DrRacket feature? Seems likely to have moderately broad utility.
Out of curiosity, what programming environment do the core Racket devs use when programming Racket? I quite like DrRacket for my projects that are only a few files, but it doesn't seem to be aimed at large scale work. -----Original Message----- From: Matthew Flatt [mailto:[email protected]] Sent: Monday, July 27, 2015 2:43 PM To: John Carmack Cc: Racket Users Subject: Re: [racket-users] continuing after a user break At Mon, 27 Jul 2015 19:32:32 +0000, John Carmack wrote: > Is it possible to continue execution after a ^b user break in DrRacket > (not debugging)? It would often be useful to be able to ^b, print > some global state, set some flags, and continue running. The `exn:break` exception record includes a `continuation` field. An exception handler can apply that continuation to resume from the point of the break. A significant limitation is that the handler has to be installed with `call-with-continuation-handler` or `uncaught-exception-handler`. If any `with-handlers` is in effect, it will catch any continuation and escape to the `with-handlers` form, at which point the continuation in `exn:break` cannot be applied (because it's an escape-only continuation). ---------------------------------------- #lang racket (let ([orig (uncaught-exception-handler)]) (uncaught-exception-handler (lambda (exn) (if (exn:break? exn) (begin (printf "continuing...\n") ((exn:break-continuation exn))) (orig exn))))) (let loop () (loop)) -- 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
