switch revisited

[Asko Kauppi <asko.kauppi@...>]

I revisited the way 'switch' was implemented in LuaX, and here's the 
code.

This approach is imho more "lua-like" than the earlier, based on Eric 
Tetz's code was.  Also, it only consumes the "switch" keyword, and uses 
neither "case" nor "default".

Comments are welcome, but for those not being there the "last time" 
have a look at 
http://archive.neotonic.com/archive/lua-l/browse_frm/thread/3024/13494  
thread first. :)

(oops, that was the 'continue' thread, but there's some on switch about 
the same time..)


BTW, could "do ... end" be used instead of anonymous non-parameter 
closures?  has anyone done that:

--      switch( action, {
--              [DOG_BARK]= do print "Arf!!!" end,
--              [DOG_BITE]= do print "Chomp!" end,
--              [DOG_SLEEP]= do print "Zzzzzz..." end,
--              } ) or print "Default!"

-ak