new "warning" behavior

[Joshua Rigler]

I tried using nabble, but found no detailed discussions beyond 
"warning's behavior has changed in 2.9.x".  So, will someone tell me 
where I can find the code that implements warning as a built-in function 
in 2.9.9?  Or if you're feeling really generous, you might explain the 
basic logic of the algorithm.

My problem is that I would like to turn off all warnings temporarily, 
then return to the initial warning state, which by default has several 
identifiers turned 'off', but the 'all' identifier turned 'on' (btw, is 
there a set of precedence rules invoked here or what?  My first thought 
is that if 'all' is 'on', then everything else should be 'off').

Anyway, I have tried the following:


  ws=warning;
  warning('off');
  <do stuff>
  warning(ws) ...or... warning(ws.state, ws.identifier)


Both forms just result in the identifier 'all' being turned on, which is 
clearly not what the state was to begin with.  I suppose I could loop 
over each element of ws, but this seems rather ugly.  Even if this is a 
feature that has been fixed/improved in CVS, I'd appreciate a pointer to 
the source code, for future reference.

Thanks,

EJR