[ruby-core:90868] [Ruby trunk Bug#15500] Behavior of require method in 2.5 is different from 2.4 and 2.6

Issue #15500 has been updated by marcandre (Marc-Andre Lafortune).


I was expecting the behavior in 2.5. That's what is correct, right?

I tested with `matrix` gem, and 2.4 behaves like 2.5, which is to say it loads the gem only if `gem 'matrix'` is called. Note that 2.4 didn't ship with default `matrix` gem (it was std lib), but it did ship with defaut `bigdecimal` gem.

I also realized that it's not possible to load the 0.1.0 `matrix` gem in 2.6.0 because it shipped with that version of the local gem. That in itself is a problem, as the public gem `matrix` v0.1.0 is actually older than the local gem that has shipped with Ruby 2.6.0. I will release v1.0.0 to avoid this issue, and I will have to be careful when mirroring the gem.

----------------------------------------
Bug #15500: Behavior of require method in 2.5 is different from 2.4 and 2.6
https://bugs.ruby-lang.org/issues/15500#change-76055

* Author: mrkn (Kenta Murata)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.5.3p105 (2018-10-18 revision 65156) [x86_64-darwin18]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
On Ruby 2.5, `require 'bigdecimal'` does not load `bigdecimal.so` in gem-installed version of bigdecimal without specifying the version by `gem` method.
You can examine this phenomenon by the following code.

```ruby
require 'bigdecimal'
p $LOADED_FEATURES.grep(/bigdecimal/).first
```

After installing bigdecimal-1.4.2 by `gem install bigdecimal` command, this code (saved as `t.rb`) show the following results:

On Ruby 2.4.5

```
$ ruby-2.4.5 -v t.rb
ruby 2.4.5p335 (2018-10-18 revision 65137) [x86_64-darwin18]
"/Users/mrkn/.rbenv/versions/2.4.5/lib/ruby/gems/2.4.0/gems/bigdecimal-1.4.2/lib/bigdecimal.bundle"
```

On Ruby 2.5.3:

```
$ ruby-2.5.3 -v t.rb
ruby 2.5.3p105 (2018-10-18 revision 65156) [x86_64-darwin18]
"/Users/mrkn/.rbenv/versions/2.5.3/lib/ruby/2.5.0/x86_64-darwin18/bigdecimal.bundle"
```

On Ruby 2.6.0:

```
$ ruby-2.6.0 -v t.rb
ruby 2.6.0p0 (2018-12-25 revision 66547) [x86_64-darwin18]
"/Users/mrkn/.rbenv/versions/2.6.0/lib/ruby/gems/2.6.0/gems/bigdecimal-1.4.2/lib/bigdecimal.bundle"
```

On Ruby 2.5.3, with `gem 'bigdecimal', '1.4.2'`, the correct file can be loaded.

```
$ ( echo "gem 'bigdecimal', '1.4.2'"; cat t.rb ) | ruby-2.5.3 -v -
ruby 2.5.3p105 (2018-10-18 revision 65156) [x86_64-darwin18]
"/Users/mrkn/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/bigdecimal-1.4.2/lib/bigdecimal.bundle"
```



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