How do I pass a JS function expression for creating an swc plugin in rust?

Question

I am trying to follow this SWC documentation for developing a plugin that can compile to wasm. The visit_mut_callee function has a conditional statement

if let Callee::Expr(expr) = callee {

Callee::Expr(expr) accepts a Box<Expr> as per documentation, being new to rust I am unsure of what exactly needs to be passed.

use swc_plugin::*;

struct MatchExample;

impl VisitMut for MatchExample {
    fn visit_mut_callee(&mut self, callee: &mut Callee) {
        callee.visit_mut_children_with(self);

        if let Callee::Expr(expr) = callee {
            // expr is `Box<Expr>`
            if let Expr::Ident(i) = &mut **expr {
                i.sym = "foo".into();
            }
        }
    }
}

Goal

To use the visit_mut_callee to detect a function expression within a codebase, the expression I would like to detect is getMyFileMetaInfo.

Example,

<SomeReactComponent metaInfo={getMyFileMetaInfo()} />

Answer 1

Resolved it by using Box::new to wrap the Expr type with it.

let _box_expr = Box::new(build_get_file_claim_expr());