Running command with overloaded run function with all params having default values prints help instead of running command

[rgoldberg]

If a run function is defined with parameters, each of which has a default value (e.g., func run(arg: Type = defaultValue)), the function can be called via run().

Each ParsableCommand has a default run() function that outputs its help info, however, so that gets called instead of the overload with its default values.

If run() isn't specifically overridden in a subtype of ParsableCommand, but it is overloaded by another function that has default values for each of its parameters, can you autogenerate a run() that calls the defaulted overload?

This is similar to other open issues (#622 & #538), all of which stem from the default implementation of run() in ParsableCommand (see #622 (comment)).

ArgumentParser version:
1.5.0

Swift version:
swift-driver version: 1.62.15 Apple Swift version 5.7.2 (swiftlang-5.7.2.135.5 clang-1400.0.29.51)
Target: x86_64-apple-macosx12.0

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

@main
struct Command: ParsableCommand {
    func run(param: String = "default") {
        print("Ran defaulted overload")
    }
}

Expected behavior

Prints "Ran defaulted overload"

Actual behavior

Prints help info for command