Gem::Commands::WhichCommand#execute

# File tmp/rubies/ruby-3.4.1/lib/rubygems/commands/which_command.rb, line 39
def execute
  found = true

  options[:args].each do |arg|
    arg = arg.sub(/#{Regexp.union(*Gem.suffixes)}$/, "")
    dirs = $LOAD_PATH

    spec = Gem::Specification.find_by_path arg

    if spec
      if options[:search_gems_first]
        dirs = spec.full_require_paths + $LOAD_PATH
      else
        dirs = $LOAD_PATH + spec.full_require_paths
      end
    end

    paths = find_paths arg, dirs

    if paths.empty?
      alert_error "Can't find Ruby library file or shared library #{arg}"
      found = false
    else
      say paths
    end
  end

  terminate_interaction 1 unless found
end