[ruby-core:80871] [Ruby trunk Bug#13510] Problems with dependency resolution - Molinillo algo

Issue #13510 has been reported by sarangan12 (Sarangan Rajamanickam).

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Bug #13510: Problems with dependency resolution - Molinillo algo
https://bugs.ruby-lang.org/issues/13510

* Author: sarangan12 (Sarangan Rajamanickam)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.0.0p648 (2015-12-16 revision 53162) [x86_64-darwin16.3.0]
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
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This is the gemspec defined for the azure ruby gem (https://github.com/Azure/azure-sdk-for-ruby/blob/asm/azure.gemspec#L39)

 ` if RUBY_VERSION < "2.1.0"
    s.add_runtime_dependency('nokogiri',              '~> 1.6.0')
  else
    s.add_runtime_dependency('nokogiri',              '~> 1.7')
  end`

Now, with ruby version 2.0.0, I get the following error:

ERROR:  Error installing azure:
	nokogiri requires Ruby version >= 2.1.0.

which should never happen because for ruby 2.0.0, the nokogiri version of 1.6.8.1 must be installed and not 1.7.1 (which needs Ruby version >= 2.1.0)

On debugging, I ended up with this code:  (in resolver.rb)
`
 def resolve
    locking_dg = Molinillo::DependencyGraph.new
    puts locking_dg
    Molinillo::Resolver.new(self, self).resolve(@needed.map { |d| DependencyRequest.new d, nil }, locking_dg).tsort.map(&:payload).compact
  rescue Molinillo::VersionConflict => e    
    conflict = e.conflicts.values.first
    raise Gem::DependencyResolutionError, Conflict.new(conflict.requirement_trees.first.first, conflict.existing, conflict.requirement)
  ensure
    @output.close if defined?(@output) and !debug?
  end
`

The output of this module is:
`
{
   :name=>"azure", 
   :number=>"0.7.9", 
   :platform=>"ruby",
   :dependencies=>[
       ["thor", "~> 0.19"], 
	["systemu", "~> 2.6"], 
	["nokogiri", "~> 1.7"], 
	["mime-types", "< 4.0, >= 1"], 
	["faraday_middleware", "~> 0.10"], 
	["faraday", "~> 0.9"], 
	["azure-core", "~> 0.1"], 
	["addressable", "~> 2.3"]
]
}
`

I am surprised at this return value. Why is this happening? The Molinillo algorithms reports incorrect version of nokogiri. 




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