On Tue, Jun 05, 2007 at 09:42:14AM -0400, Matthias Felleisen wrote: > Why don't you add | so that you can write [ n | (< 0 n 11)] ? -- Matthias Wouldn't you have to escape the stick: [ n \| (< 0 n 11)] ? Every time I think about using | in an identifier or token, I run into this, decide the backslash is too ugly, and fall back on ! instead. Richard