[plt-scheme] probably dumb question, but...

Psy-Kosh wrote:

>  
> I was messing around a bit, and discovered something... odd.
>
> consider the following:
>
> Welcome to DrScheme, version 209.
> Language: Textual (MzScheme, includes R5RS).
> > ;this is expected:
> > ,a
> unquote: not in quasiquote in: (unquote a)
> > ;the rest of this confuses me:
> > ',a
> ,a
> > (symbol? ',a)
> #f

Think of ,a as short for (unquote a).
Thus ',a evaluates to a list whose first element is the symbol unquote and
the second element is the symbol a.

  > (list? ',a)
  #t
  > (first ',a)
  unquote
  > (second ',a)
  a

Compare this with 'foo which is short for (quote foo).

-- 
Jens Axel Søgaard