This package no longer builds in release mode on linux

[finagolfin]

Building in release mode produces this since #410 was merged:

> ./swift-5.6.2-RELEASE-ubuntu20.04/usr/bin/swift build -c release
/home/butta/swift-argument-parser/Sources/ArgumentParserTestHelpers/TestHelpers.swift:12:18: error: module 'ArgumentParser' was not compiled for testing
@testable import ArgumentParser

That means the last working version was 1.0.3. A workaround is to add -Xswiftc -enable-testing.

ArgumentParser version: latest commit df9ee66 from the main branch
Swift version: 5.5 and later, probably earlier versions too

Checklist

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

[natecook1000]

@buttaface Could you verify that this issue is resolved with the latest version of main?

[finagolfin]

Yep, works now, thanks. 😄