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