Not parsing positional argument

[RISCfuture]

I have a ParsableCommand instance with two positional arguments, one of which is required. Despite passing a value for the required argument, it still claims that argument is not being specified.

ArgumentParser version: main
Swift version: 5.7.0.127.4

Checklist

• If possible, I've reproduced the issue using the main branch of this package
• I've searched for existing GitHub issues

Steps to Reproduce

import Foundation
import ArgumentParser

@main
struct ExampleCommand: ParsableCommand {
    @Argument(help: "arg1",
              completion: .file(extensions: ["sql"]),
              transform: URL.init(fileURLWithPath:))
    var firstArg = URL(fileURLWithPath: "default/value.sql")
    
    @Argument(help: "arg2",
              completion: .file(extensions: ["csv"]),
              transform: URL.init(fileURLWithPath:))
    var secondArg
    
    @Flag(help: "Include extra information in the output.")
    var verbose = false
    
    mutating func run() throws {
      print(firstArg, secondArg)
    }
}

Run example-command some/file.csv

Expected behavior

Prints the two arguments.

Actual behavior

Error: Missing expected argument '<second-arg>'
Help:  <second-arg>  arg2
Usage: example-command [<first-arg>] <second-arg> [--verbose]
  See 'example-command --help' for more information.
Program ended with exit code: 64

[natecook1000]

This is behaving as intended, since positional arguments are always filled in declaration order. It would be nice if we had a warning or validation error for commands with this configuration, so that you don't have to wonder what's going on.