[racket] boolean in PLAI

Added.

At Thu, 16 Jan 2014 16:51:36 -0500, Marco Morazan wrote:
> Thank you Matthew & Shriram. I would actually prefer for booleans to be
> within S-expression. It seems to be a lot more intuitive for my current
> students to have observers to test for a boolean S-expr and to extract a
> (Racket) boolean value from an S-expression.
> 
> Cheers,
> 
> Marco
> 
> 
> On Thu, Jan 16, 2014 at 3:30 PM, Matthew Flatt <mflatt at cs.utah.edu> wrote:
> 
> > We always spelled it out as `true` and `false` (and, yes, you have to
> > check for those before parsing other identifiers).
> >
> > I wouldn't mind allowing booleans within S-expression, though, if you'd
> > like me to add it.
> >
> > At Thu, 16 Jan 2014 15:26:11 -0500, Marco Morazan wrote:
> > > Dear All,
> > >
> > > In plai-typed, an S-expression cannot be a boolean, correct? How can I
> > > parse a boolean? The idea here is to construct a boolean expression when
> > a
> > > boolean is encountered in the input/
> > >
> > > --
> > >
> > > Cheers,
> > >
> > > Marco
> > >
> > > Have a´¨)
> > > ¸.·´¸.·*´¨) ¸.·*¨)
> > > (¸.·´ (¸.·´ * wonderful day! :)
> > > ____________________
> > >   Racket Users list:
> > >   http://lists.racket-lang.org/users
> >
> 
> 
> 
> -- 
> 
> Cheers,
> 
> Marco
> 
> Have a´¨)
> ¸.·´¸.·*´¨) ¸.·*¨)
> (¸.·´ (¸.·´ * wonderful day! :)