I'm using DrRacket to develop R6RS programs but I often see a bug where DrRacket hangs when either clicking on Check Syntax or Run. For example when checking syntax the message 'Check Syntax: expanding expression' is displayed at the bottom of the DrRacket window but no progress is made. Clicking on Stop shows the error message
C:\Program Files\Racket\collects\compiler\cm.rkt:213:2: user break
As far as I've been able to tell the problem always happens when running a program that imports a user library. I'm able to run the user library directly but for some reason there a problem when importing that same library into a program. I'm also able to use raco make on the same program without any issues, so I don't think there is any problem with the code.
A few more details. When I see this problem the Windows Task Manager shows that DrRacket is consuming no CPU (although a lot of memory). The memory use indication at the bottom right of the DrRacket window is ticking over, showing that DrRacket has not completely frozen. This feels like a thread deadlock situation to me. I have the latest version of DrRacket (8.7).
Any solution or workaround would be appreciated.
