Can a function takes as input a closure that returns a "impl trait"

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2

It doesn't have exactly the same semantics as your code (no existential type stuff here), but would it be acceptable to use generics for your use case?

trait MatVecMul {}

fn solve<F, M>(a: Vec<f64>, mul: F) -> f64
where
    F: FnOnce(i32) -> M,
    M: MatVecMul
{ ... }
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