mismatched types when referencing the app from an instance of a struct.

[pixmusix]

I want to include a reference to the app inside my structure.
This will allow my instance to refer to the window and time of the application.
This will require me to assign a lifetime of the reference.
I think that lifetime should be static based on my reading of the lib.rs file.

struct ParticleSystem {
    app : &'static App,
    particles: Vec<Particle>,
}

However

error[E0308]: mismatched types
--> src/main.rs:256:17
|
256 | nannou::app(model).update(update).run();
| ----------- ^^^^^ one type is more general than the other
| |
| arguments to this function are incorrect
|
= note: expected fn pointer for<'a> fn(&'a nannou::App) -> _
found fn item fn(&'static nannou::App) -> Model {model}

I've actually not encounter this error before but I get the gist.
It feels like I'm either one sprinkle of syntactic sugar away from compiling or my approach is simply wrong.

May I have some guidance?
Thanks 👍
Pix ❣️