[racket] Void expression found

See Dybvig's paper on this issue (cons vs values). This is an SE-PL trade off. 


On Jan 6, 2015, at 7:05 PM, Benjamin Greenman wrote:

> From a practical point of view, at the low level the implementation is
> heavily optimized for functions that return exactly one value.
> Functions that return a different number of values are slower.
> 
> Does this mean I'm better off returning (cons a b) than (values a b)?
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