pub fn main(world: World) -> Void raises {
    let values: [4]i32 = [10, 20, 30, 40]
    let sameValues: [4]i32 = [10, 20, 30, 40]
    let middleValues: [2]i32 = [20, 30]
    let bytes: Span<u8> = std.mem.span("ok")
    let valuesSpan: Span<i32> = values
    let sameSpan: Span<i32> = sameValues
    let middle: Span<i32> = values[1..3]
    let expectedMiddle: Span<i32> = middleValues
    if std.mem.len(valuesSpan) == 4 && std.mem.len(middle) == 2 && std.mem.eqlBytes(valuesSpan, sameSpan) && std.mem.eqlBytes(middle, expectedMiddle) && std.mem.len(bytes) == 2 {
        check world.out.write("generic mem ok\n")
    }
}