// retoor <retoor@molodetz.nl>
import "argparse" for ArgumentParser
var parser = ArgumentParser.new()
parser.addArgument("filename")
parser.addArgument("output", {"required": false, "default": "out.txt"})
var args = parser.parseArgs(["input.txt"])
System.print(args["filename"]) // expect: input.txt
System.print(args["output"]) // expect: out.txt
var args2 = parser.parseArgs(["input.txt", "result.txt"])
System.print(args2["filename"]) // expect: input.txt
System.print(args2["output"]) // expect: result.txt