Function create_render_effect 

pub fn create_render_effect<T>(
    fun: impl FnMut(Option<T>) -> T + 'static,
) -> RenderEffect<T>
where
    T: 'static,

👎Deprecated:

This function is being removed to conform to Rust idioms. Please use RenderEffect::new() instead.

Creates a new render effect, which immediately runs fun.