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//@ run-rustfix
// Point at the captured immutable outer variable
#![feature(ergonomic_clones)]
#![allow(incomplete_features)]
fn foo(mut f: Box<dyn FnMut()>) {
f();
}
fn main() {
let mut y = true;
foo(Box::new(use || y = !y) as Box<_>);
//~^ ERROR cannot assign to `y`, as it is not declared as mutable
}
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