Direct function invocation without instance

[florianhartung]

A user of our interpreter might want an abstraction that allows to invoke FunctionsRefs without having to pass a &mut RuntimeInstance everytime:

let fibonacci: FunctionRef = instance.get_function_by_name("my_module", "fibonacci").unwrap();

// Current approach
let result: u32 = fibonacci.invoke(&mut instance, 5);

// We want this
let result: u32 = fibonacci.invoke(5);

[florianhartung]

I think we should provide this functionality as a layer on top of our interpreter, that the user can opt in to, as this layer may come with a slight performance penalty.

[cemonem]

What if the function is accessing stuff that have to be instantiated besides it? element segments, data segments etc. Is there API out there we could be inspired from?