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// check-pass
use std::cell::RefCell;
use std::rc::Rc;
pub struct Callbacks {
callbacks: Vec<Rc<RefCell<dyn FnMut(i32)>>>,
}
impl Callbacks {
pub fn register<F: FnMut(i32)+'static>(&mut self, callback: F) {
self.callbacks.push(Rc::new(RefCell::new(callback)));
}
}
fn main() {}
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