rust/tests/run-pass/concurrency/issue1643.rs

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use std::thread::spawn;
fn initialize() {
initialize_inner(&mut || false)
}
fn initialize_inner(_init: &mut dyn FnMut() -> bool) {}
fn main() {
let j1 = spawn(initialize);
let j2 = spawn(initialize);
j1.join().unwrap();
j2.join().unwrap();
}