What do you propose for/first should return if the set s is empty? It will be somewhat difficult to make it divine that it ought to return two values. Perhaps, if this feature is adopted, for/first should allow a #:default keyword to specify the return value if no elements crop up, so you can put in the right number of values.
Carl Eastlund On Sun, Aug 29, 2010 at 8:21 PM, David Van Horn <dvanh...@ccs.neu.edu> wrote: > Why is the body of a for/first a single valued context? I would expect this > to work: > > (let ((s (set 1 3 10))) > (for/first ((x (in-set s))) > (values x (set-remove s x)))) > > But I get: > > context expected 1 value, received 2 values: 1 (set 3 10) > > (By the way, this operation would be nice to have in racket/set.) > > David _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev
