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struct Foo(x,y:Int)
func main()
assert (+: [10, 20, 30]) == 60
>> empty_ints : [Int]
assert (+: empty_ints) == none
assert (+: [10, 20, 30]) or 0 == 60
assert (+: empty_ints) or 0 == 0
assert (_max_: [3, 5, 2, 1, 4]) == 5
assert (_max_.abs(): [1, -10, 5]) == -10
assert (_max_: [Foo(0, 0), Foo(1, 0), Foo(0, 10)])! == Foo(x=1, y=0)
assert (_max_.y: [Foo(0, 0), Foo(1, 0), Foo(0, 10)])! == Foo(x=0, y=10)
assert (_max_.y.abs(): [Foo(0, 0), Foo(1, 0), Foo(0, 10), Foo(0, -999)])! == Foo(x=0, y=-999)
say("(or) and (and) have early out behavior:")
assert (or: i == 3 for i in 9999999999999999999999999999)! == yes
assert (and: i < 10 for i in 9999999999999999999999999999)! == no
assert (<=: [1, 2, 2, 3, 4])! == yes
assert (<=: empty_ints) == none
assert (<=: [5, 4, 3, 2, 1])! == no
assert (==: ["x", "y", "z"]) == no
assert (==.length: ["x", "y", "z"]) == yes
assert (+.length: ["x", "xy", "xyz"]) == 6
assert (+.abs(): [1, 2, -3]) == 6
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