From: Michal Suchanek <hramrach@...>
Date: 2009-02-13T05:00:10+09:00
Subject: [ruby-core:22043] Re: 1.8.7 Specifics

On 12/02/2009, Akinori MUSHA <akinori.musha@gmail.com> wrote:
> On Thu, Feb 12, 2009 at 9:59 PM, Michal Suchanek <hramrach@centrum.cz> wrote:
>  > 2009/2/12 Akinori MUSHA <akinori.musha@gmail.com>:
>  >> On Thu, Feb 12, 2009 at 9:24 AM, Michal Suchanek <hramrach@centrum.cz> wrote:
>  >>> Some methods in 1.8.7 return Enumerator instead of an Array. This adds
>  >>
>  >> Would you please name an example?
>  >>
>  >> I think I was careful enough not to change the existing behavior
>  >> unless it was pretty certain that no one would rely on it. (e.g.
>  >> return value was undefined/undetermined/undocumented, omitting a block
>  >> simply causes exception, etc.)
>  >
>  > To give an example of code which is broken by Enumerator:
>  >
>  >  File.open("2.6.28-rc6-rc7.patch"){|f|f.lines[1..3]}
>  > NoMethodError: undefined method `[]' for #<Enumerable::Enumerator:0xb7db5634>
>  >        from (irb):1
>  >        from (irb):1:in `open'
>  >        from (irb):1
>  >        from :0
>
>
> Ruby 1.8.6 did not have {IO,File}#lines.  It first appeared in 1.8.7
>  as part of backport from 1.9.
>  You must be confusing with something else.

Yes, there is no IO#lines in 1.8.6.

As documented by ri there is no use of Enumerator that would break anything.

And in my code I see no instance of to_a so I have likely dropped that part.

I recall I had a problem with a script that failed because of a method
missing on Enumerator when Debian upgraded to 1.8.7 but I have not
reported it as a bug because nobody seemed to care at the time and the
workaround was easy enough.

Maybe the code was broken to start with. Until I find what it was I
cannot be sure.

Thanks

Michal