fn g[T](arr []T) {
    mut r := []T{}
    r << arr
    assert arr.len > 0
}

fn test_generic_array_append() {
    g([1, 2, 3])
    g([1.1, 2.2, 3.3])
    g(['aa', 'bb', 'cc'])
    gs[[]string]()!
}

fn gs[T]() !T {
    mut typ := T{
        cap: 10
    }
    if T.name == '[]string' {
        typ << 'strings'
    } else {
        return error('only string arrays are supported')
    }
    return typ
}