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// check-pass
#![allow(unused_variables)]
use std::collections::HashMap;
use std::collections::hash_map::Entry::Vacant;
pub fn foo() {
type F = Box<dyn Fn(&()) + 'static>;
let mut map: HashMap<(), F> = HashMap::new();
let x: &mut F = match map.entry(()) {
Vacant(_) => unimplemented!(),
_ => unimplemented!()
};
}
fn main() {}
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