I've just pushed an extension of DrRacket to support online check syntax that I demoed at RacketCon. (This will not be in the upcoming release by in the release 3 months from now.) The new little blue (and sometimes green) dot in the bottom corner of the drracket window lets you know when it is working (as will your CPU load meter). If the dot turns red, then it was disabled for some reason (eg, your program tried to write to the filesystem during expansion) and you can mouse over the dot to find out why.
In addition to adding user-level functionality to DrRacket, there are two new API-level additions. To add other online information into the DrRacket buffer see the docs for drracket:module-language-tools:add-online-expansion-handler. To use check syntax programmatically, see (the new) chapter 8 in the tools manual. Please let me know if you run into any problems. I have seen it get stuck such that the blue dot never turns off, but there is no CPU load and nothing seems to be happening. I've added some logging (at the info level); if you see that happening, please look at your log and send me the end of it as it may have a clue to what is going wrong. (If, by some miracle, you can make it get stuck, please tell me that too.) Robby _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
