From: zn@...
Date: 2016-09-15T13:31:24+00:00
Subject: [ruby-core:77284] [Ruby trunk Bug#12764] rubygems with multi	default gem problem

Issue #12764 has been reported by Kazuhiro NISHIYAMA.

----------------------------------------
Bug #12764: rubygems with multi default gem problem
https://bugs.ruby-lang.org/issues/12764

* Author: Kazuhiro NISHIYAMA
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: trunk
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
This issue may affect Ruby committers only.
This does not probably affect released ruby.

With development ruby, `make install` many times.
After them, default gems are duplicated when exists updated.
And gem with old version in Gemfile does not work well.

Example:

```
% gem list rdoc

*** LOCAL GEMS ***

rdoc (default: 5.0.0.beta2, default: 4.2.1)
% cat Gemfile
# frozen_string_literal: true
source "https://rubygems.org"

# gem "rails"
gem 'rdoc', '4.2.1'
% cat Gemfile.lock
GEM
  remote: https://rubygems.org/
  specs:
    rdoc (4.2.1)

PLATFORMS
  ruby

DEPENDENCIES
  rdoc (= 4.2.1)

BUNDLED WITH
   1.13.0
% bundle exec ruby -r rdoc -e 'p RDoc::VERSION'
"5.0.0.beta2"
```

FYI: [Difference of bundled gem and default gem (in Japanese)](http://blog.n-z.jp/blog/2016-09-10-bundled-gem-and-default-gem.html)



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