> Yes, DrRacket's "constructor" mode does this. This code was based on the 
> teaching languages though, and the teaching languages set 
> `booleans-as-true/false` to false here:
> https://github.com/racket/htdp/blob/master/htdp-lib/htdp/bsl/runtime.rkt#L15
> 
> Neither one is really more "constructor"-y than the other.

I see. Thanks for the clarification.

> The `constructor-style-print` function isn't supposed to add a newline.

Okay, I got confused because in DrRacket, running 

----------
#lang constructor-style-print racket 
true
false
(cdr (list 1 2 3))
----------

was resulting in 
----------
#t#f(list 2 3)
----------
(no whitespace, no newline) in the interaction window. But here again, maybe 
the initial use case was not including this kind of program either.

>From the racket REPL, which is what I really need, it does behaves correctly 
>without the call to pretty-write.

Thanks for the feedback, Alex.

Delphine

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