Gem::AvailableSet#remove_installed!

# File tmp/rubies/ruby-3.0.5/lib/rubygems/available_set.rb, line 148
def remove_installed!(dep)
  @set.reject! do |t|
    # already locally installed
    Gem::Specification.any? do |installed_spec|
      dep.name == installed_spec.name and
        dep.requirement.satisfied_by? installed_spec.version
    end
  end

  @sorted = nil
  self
end