From: Aaron Patterson <aaron@...>
Date: 2011-07-09T02:40:53+09:00
Subject: [ruby-core:37898] Re: [Ruby 1.8 - Feature #4979] `require 'foo'` is ambiguous when there is both foo.rb and foo.so


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On Sat, Jul 09, 2011 at 01:04:08AM +0900, Antonio Terceiro wrote:
> When there is both foo.rb and foo.so and a `require 'foo'` call is evalua=
ted, Ruby 1.8 will load either foo.rb or foo.so depending on which order th=
eir directories are in $LOAD_PATH.
>=20
> Ruby 1.8 will load the first foo.rb or foo.so it finds in the $LOAD_PATH.
>=20
> Ruby 1.9 will first look for foo.rb in all directories, and only after th=
at it will look for foo.so in all directories. This behaviour seems more co=
nsistent than the one in Ruby 1.8. It also matches the most common use case=
, which is foo.rb loading its sister foo.so that contains native-code imple=
mentations needed by foo.rb.
>=20
> I have attached a test case that shows these different behaviours of Ruby=
 1.8 and Ruby 1.9.
>=20
> I propose to make Ruby 1.8 work the same way as Ruby 1.9. If there is con=
sensus about that, I can try to write a patch to backport the behaviour of =
Ruby 1.9 for Ruby 1.8.

Making this change would break 1.8 users that depend on this behavior.
Users may *unknowingly* depend on this behavior.  Imagine someone's pain
that makes what *seems* like a safe upgrade (say 1.8.7-p1 to 1.8.7-p2),
and boom, my application stops working because of require behavior
change.

Contrast that with upgrading to 1.9, where the user *knows* some
behaviors of Ruby may have changed.

This isn't a bug, it's a behavior.  Leave 1.8 as is.  Let users upgrade to =
1.9.

--=20
Aaron Patterson
http://tenderlovemaking.com/

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