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struct Foo(x:Int, y:Int)
func len(f:Foo->Num)
return Num.sqrt(Num(f.x*f.x + f.y*f.y))!
func main()
assert (3 _min_ 5) == 3
assert (5 _min_ 3) == 3
assert (Foo(5, 1) _min_ Foo(5, 999)) == Foo(x=5, y=1)
assert (Foo(5, 999) _min_.x Foo(5, 1)) == Foo(x=5, y=999)
assert (Foo(999, 1) _min_.y Foo(1, 10)) == Foo(x=999, y=1)
assert (Foo(-999, -999) _max_.len() Foo(10, 10)) == Foo(x=-999, y=-999)
>> foos := [Foo(5, 1), Foo(5, 99), Foo(-999, -999)]
assert (_max_: foos)! == Foo(x=5, y=99)
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