message: Fix invalid return type
diff: @@ -619,7 +619,7 @@ pub trait GenericImage: GenericImageView {
  ///
  /// # Returns
  /// Returns an error if the image is too large to be copied at the given position
  - fn copy_from<O>(&mut self, other: &O, x: u32, y: u32) -> bool
  + fn copy_from<O>(&mut self, other: &O, x: u32, y: u32) -> ImageResult<()>
  where
  O: GenericImageView<Pixel = Self::Pixel>,
  {
  