Function NSRectFillListWithGrays 

pub unsafe extern "C-unwind" fn NSRectFillListWithGrays(
    rects: NonNull<NSRect>,
    grays: NonNull<CGFloat>,
    num: NSInteger,
)

Available on crate features NSGraphics and objc2-core-foundation only.

Safety

• rects must be a valid pointer.
• grays must be a valid pointer.