Re: RFC 104 (v1) Backtracking

[Johan Vromans]

Damian Conway <[EMAIL PROTECTED]> writes:

>    > As I understand things:
>    > 
>    >  BLOCK1 andthen BLOCK2
>    > 
>    > evaluates BLOCK1 and then if BLOCK1 evaluates to "true" evaluates
>    > BLOCK2.  If BLOCK2 evaluates to "true" we're done.  If BLOCK2
>    > evaluates to "false", then BLOCK1 is re-evaluated. 
> 
> So how is that different from:
> 
>       do BLOCK1 until do BLOCK2

It's the same.
But the real fun starts when blocks and functions can suspend and
resume. 

   { ...
     # Return value and suspend.
     suspend $i;
     # Next iteration will resume here
     ...
   } andthen { ... };

-- Johan