Gem::Resolver::Conflict#explanation

# File tmp/rubies/ruby-3.0.5/lib/rubygems/resolver/conflict.rb, line 53
  def explanation
    activated   = @activated.spec.full_name
    dependency  = @failed_dep.dependency
    requirement = dependency.requirement
    alternates  = dependency.matching_specs.map {|spec| spec.full_name }

    unless alternates.empty?
      matching = <<-MATCHING.chomp

  Gems matching %s:
    %s
      MATCHING

      matching = matching % [
        dependency,
        alternates.join(', '),
      ]
    end

    explanation = <<-EXPLANATION
  Activated %s
  which does not match conflicting dependency (%s)

  Conflicting dependency chains:
    %s

  versus:
    %s
%s
    EXPLANATION

    explanation % [
      activated, requirement,
      request_path(@activated).reverse.join(", depends on\n    "),
      request_path(@failed_dep).reverse.join(", depends on\n    "),
      matching
    ]
  end