[racket] Confused about define-values(-for-export) forms in define-signature

On Apr 3, 2014, at 9:04 AM, Matthew Flatt <mflatt at cs.utah.edu> wrote:

> In other words, defining a variable in a signature is a lot like
> defining a method in an Java interface. Defining `y` as a constant is
> not especially useful


If you follow the Java precedent, it is somewhat useful to have 
interfaces that define 'global' constants: 

 width = 10 
 height = width * 2 
 ...

Same here. -- Matthias