class RuboCop::Cop::Rails::UnusedRenderContent

head 100
head :continue
# good
render status: 100, plain: ‘Ruby!’
render ‘foo’, status: :continue
# bad
@example
This cop checks for uses of ‘render` which specify both body content and a non-content status.
it will be dropped from the response.
If you try to render content along with a non-content status code (100-199, 204, 205, or 304),

def on_send(node) 

def on_send(node)
  unused_render_content?(node) do |unused_content_node|
    add_offense(unused_content_node)
  end
end