This problem was caused by a bug in the bytecode compiler. The bug was exposed by usual code (including a `set!' to an other unused procedure `let' binding) in the "Debug" button's transformation of the expanded `match' form.
I've pushed a repair to the git repo. At Tue, 08 Nov 2011 23:17:32 -0500, Prabhakar Ragde wrote: > I never use the Debug button, but I let my students start using Advanced > Student today, and of course they tried it out. > > The following program induces a strange error when the Debug button is > pressed. > > (match 3 > [`(,x) 3] > [x 3]) > > The error is: > internal error: skipped binding is used > > after which the program hangs, though it can be stopped with the Stop > button. --PR > _________________________________________________ > For list-related administrative tasks: > http://lists.racket-lang.org/listinfo/users _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
