Possible wrong optimization? renderer.copy renders nothing with optimizations turned on.

gistfile1.rs

extern crate sdl2;

fn main() {

    sdl2::init(sdl2::InitVideo);

    let window = match sdl2::video::Window::new("Text example",
                                                sdl2::video::PosCentered,
                                                sdl2::video::PosCentered,
                                                640, 480,
                                                sdl2::video::OpenGL) {
        Ok(win) => win,
        Err(err) => fail!("Error creating window: {}", err)

    };

    let renderer = match sdl2::render::Renderer::from_window(
        window,
        sdl2::render::DriverAuto,
        sdl2::render::Accelerated) {
        
        Ok(renderer) => renderer,
        Err(err) => fail!("Error creating renderer: {}", err)
    };

    let _ = renderer.set_draw_color(sdl2::pixels::RGB(255, 0, 0));
    let _ = renderer.clear();

    let surface = match sdl2::surface::Surface::new(sdl2::surface::SWSurface, 100, 100, 32,
                                        0x000000FFu32, 0x0000FF00u32,
                                        0x00FF0000u32, 0xFF000000u32) {
        Ok(s) => s,
        Err(e) => fail!("Failed to create surface. {}", e)
    };

    // Make the surface white.
    surface.with_lock(|pixels: &mut [u8]| {
        for pixel_idx in range(0, pixels.len()) {
            pixels[pixel_idx] = 255u8;
        }
    });
    
    let dst_rect = sdl2::rect::Rect::new(100, 100, 100, 100);

    let texture = match renderer.create_texture_from_surface(&surface) {
        Ok(t) => t,
        Err(e) => fail!("Failed to create texture. {}", e)
    };

    // Renders a white square on red background. Doesn't render with --opt-level greater than 0.
    let _ = renderer.copy(&texture, None, Some(dst_rect));

    renderer.present();
    
    'main : loop {
        'event : loop {
            match sdl2::event::poll_event() {
                sdl2::event::QuitEvent(_) => break 'main,
                sdl2::event::NoEvent      => break 'event,
                _ => ()
            };
        }

    }

    sdl2::quit();
}