Gem::Resolver#extract_extended_explanation

# File tmp/rubies/ruby-4.1.0-preview1/lib/rubygems/resolver.rb, line 603
def extract_extended_explanation(incompatibility)
  while incompatibility.cause.is_a?(Gem::PubGrub::Incompatibility::ConflictCause)
    cause = incompatibility.cause

    [cause.conflict, cause.other].each do |incompat|
      if incompat.cause.is_a?(Gem::PubGrub::Incompatibility::NoVersions) &&
         incompat.respond_to?(:extended_explanation) &&
         incompat.extended_explanation
        return incompat.extended_explanation
      end
    end

    incompatibility = cause.conflict
  end

  nil
end