From: Carlos <angus@...>
Date: 2003-12-03T00:18:15+09:00
Subject: Re: anything disappearing from Ruby for 2.0?

> > 4) while &{ line =~ /abc/ }..&{ line =~ /def/ }
> 
> This needs a hidden flip-flop variable, otherwise matching
> /abc/ will be performed each time.

Yes, because a new Proc is created every time. I didn't notice that :(. I
should have thought, if proc{...}==Proc.*new*{...}, that would be the
case :). Sorry.

> Of course, you can do it like this, but, hmmmm...
> 
>   (&{ line =~ /abc/ }..&{ line =~ /def/ }).while do
>     # ...
>   end

And also, the flip-flop is mostly used with "if" inside an external loop.
I think, if we want to keep this useful construction, must find another
way...