[racket] Make printer abbreviate unquote at the end of a list

From: Jason Hemann (jhemann at umail.iu.edu)
Date: Tue Jun 17 10:40:05 EDT 2014

Hi,

How do I make Racket's printer abbreviate unquote at the end of a list? See
the difference in behavior between racket and petite chez below.

bash-3.2$ petite
Petite Chez Scheme Version 8.3
Copyright (c) 1985-2011 Cadence Research Systems

> '(5 . ,a)
(5 . ,a)
>
bash-3.2$ racket
Welcome to Racket v6.0.1.
> '(5 . ,a)
'(5 unquote a)
>

Thanks,

JBH
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