use std::cell::RefCell;use wasm_bindgen::prelude::*; let closure_cell = Rc::new(RefCell::new(None));
let closure_cell_clone = Rc::clone(&(closure_cell_clone.borrow().as_ref().unw
但我得到了一个错误:doesn't have a size known at compile-time,或the size for values of type 'dyn Fn(u64) -> std:fn fib_callback(instance_context: Rc<RefCell<InstanceContext>>) -> impl Fn(u64) -> u64 {
// Closurelet cache:Rc</e