[swift-users] operators and external parameters

[Ray Fix via swift-users]

When defining an operator such as == you can implicitly specify external 
parameters:

struct Path: Equatable {
    var value: String

    static func ==(lhs: Path, rhs: Path) -> Bool {
        return lhs.value == rhs.value
    }
}

Is this considered okay, or is it bad form and it should really be defined:


struct Path: Equatable {
    var value: String

    static func ==(_ lhs: Path, _ rhs: Path) -> Bool {
        return lhs.value == rhs.value
    }
}

Both seem to work fine in practice… 🤔  

Thank you!
Ray
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