How did you produce this error message? When I run this program:
(require htdp/master) (define (check-color x y z w) x) (master check-color) I get no error whatsoever. I also don't get an error when I run > (master check-color) in the interactions area: Welcome to DrRacket, version 5.0.99.3--2010-11-29(f11e53c/g) [3m]. Language: Beginning Student. > (master check-color) true > -- Matthias On Nov 28, 2010, at 6:58 AM, 邢泉 wrote: > > Hi: > > Help Me! Thanks! > > > (master check-color) > check-color: this is a procedure, so it must be applied to arguments (which > requires using a parenthesis before the name) > > > 2010-11-28 > Q.Xing > _________________________________________________ > For list-related administrative tasks: > http://lists.racket-lang.org/listinfo/users
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