[SR-12930] Add protocol extension to "Result where Success == Void" so that we can use .success()

[swift-ci]

Previous ID	SR-12930
Radar	None
Original Reporter	ronyfadel (JIRA User)
Type	Improvement

Additional Detail from JIRA

Votes	0
Component/s	Standard Library
Labels	Improvement, StarterProposal
Assignee	None
Priority	Medium

md5: 176bf2fbbef4e6b7e54e92d66bdb68aa

Issue Description:

Currently, to signal a success of type Result<Void, Swift.Error>, we need to use:

.success(())

Combine, for example, special-cases Subject for when the Output is of type Void:

extension Subject where Self.Output == Void {
    /// Signals subscribers.
    public func send()
}

A similar extension could be added for `Result` so that we can use .success(()) instead:

extension Result where Success == Void {
    static func success() -> Self {
        return .success(())
    }
}
 

I'd be happy to contribute a patch if someone can point me to the proper PR policy.

[theblixguy]

There are several pitches (such as this) on the Swift forums (including a implementation PR here) which I think would be good to take a look at first.

[XaurDesu]

It seems as if the implementation PR has been closed, should this issue be worked on at the moment?