func vers: List(Int), version: Int =
    all map(v -> v == version, vers)

assert func([1, 1], 1)

func2! version: Int =
    arr = ![]
    f!() =
        arr.push! version
    f!()
    arr

arr = func2!(1)
assert arr[0] == 1

for! [1], _ =>
    result = !""
    push! left, right =
        result.push! "| \{left} | \{right} |\n"

    push! "a", "b"
    assert result == "| a | b |\n"

{SemVer;} = import "semver"

Versions! = Class Dict! { Str: List!(SemVer) }
Versions!.
    new() = Versions! !{:}
    insert!(ref! self, name: Str, version: SemVer) =
        if! self::base.get(name) == None:
            do!:
                self::base.insert! name, ![version]
            do!:
                if! all(map(v -> v != version, self::base[name])), do!:
                    self::base[name].push! version

vs = Versions!.new()
_ = vs.insert! "foo", SemVer.from_str "1.0.0"
_ = vs.insert! "foo", SemVer.from_str "1.0.1"

Triple = Class { .version = SemVer; }
Triple.
    new version = Triple { .version; }
.Version! = Class Dict! { Str: List!(Triple) }
.Version!.
    new!() = .Version! !{ "a" : ![Triple.new(SemVer.from_str("0.1.0"))] }
    insert!(ref! self, name: Str, version: SemVer) =
        if! all(map((triple) -> not(triple.version.compatible_with(version)), self::base[name])), do!:
            self::base[name].push!(Triple.new(version))

f!() =
    vers = .Version!.new!()
    vers.insert!("a", SemVer.from_str("0.2.0"))

f!()