message: Re-add ops::read warning to get fixed properly in the future
diff: @@ -525,7 +525,7 @@ impl Context {
  let rect = ::Rect { left: 0, bottom: 0, width: dimensions.0, height: dimensions.1 };
  let mut data = Vec::with_capacity(0);
  - let _ = ops::read(&mut ctxt, ops::Source::DefaultFramebuffer(gl::FRONT_LEFT), &rect,
  + ops::read(&mut ctxt, ops::Source::DefaultFramebuffer(gl::FRONT_LEFT), &rect,
  &mut data, false);
  T::from_raw(Cow::Owned(data), dimensions.0, dimensions.1)
  }
  