Ambiguous use of 'init(name:parsing:help:completion:transform:)' when transform throws

[Coeur]

Ambiguous use of 'init(name:parsing:help:completion:transform:)' when transform throws.

This is a regression introduced with #477 (swift-argument-parser 1.2.0).

ArgumentParser version: main branch
Swift version: swiftlang-5.11

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

public struct MyError: Error {}

struct MyCommand: ParsableCommand {
	@Option(transform: {
		guard let url = URL(string: $0) else {
			throw MyError()
		}
		return url
	})
	var test: URL?
}

Expected behavior

No errors.

Actual behavior

Ambiguous use of 'init(name:parsing:help:completion:transform:)'

Workarounds:

• Replacing var test: URL? with var test: URL? = nil
• Or making the transform non-throwing