Similar to #344, when a ExpressibleByArgument & CaseIterable argument from user has incorrect value, the candidate values are shown in the error message except when said value is a member of an array.

ArgumentParser version: 1.0.3.
Swift version: swift-driver version: 1.26.21 Apple Swift version 5.5.2 (swiftlang-1300.0.47.5 clang-1300.0.29.30)

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

With the following program:

import ArgumentParser

enum Noodle: String, CaseIterable, ExpressibleByArgument {
    case ramen
    case capellini
    case silkworm
}

@main
struct Dinner: ParsableCommand {
    @Argument
    var noodle: [Noodle]

    mutating func run() throws {
        print("Hmm, yummy \(noodle.first!).")
    }
}

Build and run with a wrong value for noodle. For a SwiftPM example

swift run dinner usbcable

Expected behavior

The error message should include candidate values for noodle like:

Error: The value 'hello' is invalid for '<noodle>'. Please provide one of 'ramen', 'capellini' or 'silkworm'.
Help:  <noodle>
Usage: dinner <noodle>
  See 'dinner --help' for more information.

Actual behavior

The output does not include candidate values for noodle

Error: The value 'hello' is invalid for '<noodle>'
Help:  <noodle>
Usage: dinner [<noodle> ...]
  See 'dinner --help' for more information.