[bitc-dev] Error in specification of DO

[Jonathan S. Shapiro]

On Wed, 2008-07-09 at 23:16 +0100, David-Sarah Hopwood wrote:
> Jonathan S. Shapiro wrote:
> > I tend to believe that there are good uses for all of the following
> > constructs:
> > 
> >   WHILE       perform body while test remains tr
> >   WHILE-NOT   perform body while test remains false
> >   DO-UNTIL    perform body until test becomes true, running at least
> >               once.
> > 
> > Of the three, I believe that WHILE-NOT is the least commonly useful, and
> > that it is trivially subsumed by WHILE.
> 
> C-family languages have DO..WHILE rather than DO..UNTIL, of course.

Yes. My mistake. Based on this we may safely conclude that do-while is
useful. :-)

So I now propose loop constructs named WHILE and DO-WHILE.

For the record, I considered and rejected some other loop constructs;

  DO-UNTO-OTHERS
  DONT-DO
  DONT-DO-WHILE-NOT
  DOO-BE-DOO-BE-DOO

Hmm. It's apparently later than I thought. :-)