NSPredicateOperatorBug.swift

import Foundation

// Defining this breaks the behaviour of the existing '||' operator in some cases
public func ||(lhs: NSPredicate, rhs: NSPredicate) -> NSPredicate {
    return NSCompoundPredicate(orPredicateWithSubpredicates: [lhs, rhs])
}

func foo() {
    let cards = [String: [String]]()
    let startingContactIndex: UInt = 3

    // This still works
    guard !cards.isEmpty || startingContactIndex > 0 else {
        return
    }

    // But when the lhs is an expression…
    // Binary operator '||' cannot be applied to two Bool operands
    guard cards.count > 0 || startingContactIndex > 0 else {
        return
    }
}