unwrap-or

gistfile1.txt

operator infix !|| { associativity right precedence 100 } // associativity/precedence copied from ternary ? :
@infix func !||<T>(lhs:T?, rhs:@auto_closure ()->T) -> T {
    switch lhs {
    case nil: return rhs()
    case _: return lhs!
    }
}