From: Yukihiro Matsumoto <matz@...>
Date: 2008-05-16T08:16:35+09:00
Subject: Re: Matz: can we have rescue/else/ensure available in all blocks?

Hi,

In message "Re: Matz: can we have rescue/else/ensure available in all blocks?"
    on Fri, 16 May 2008 07:02:47 +0900, coderrr <coderrr.contact@gmail.com> writes:

|This (contrived example):
|
|pages.each do |page|
|  page.links.each do |link|
|    process link
|  rescue MalformedLinkError
|    @bad_links << link
|  end
|rescue MalformedPageError
|  @bad_pages << page
|end

can be considered as 

  pages.each do |page|
    begin
      page.links.each do |link|
        begin
          process link
        rescue MalformedLinkError
          @bad_links << link
        end
      end
    rescue MalformedPageError
      @bad_pages << page
    end
  end

and

  begin
    pages.each do |page|
      begin
        page.links.each do |link|
          process link
        end
      rescue MalformedLinkError
        @bad_links << link
      end
    end
  rescue MalformedPageError
    @bad_pages << page
  end

If it contains ensure, things are more complicated.  Perhaps you would
expect

   foo do
      break
   ensure
      puts "foo"
   end

would print "foo" even when foo does not give control to the block.


							matz.