src/test/ui/borrowck/borrowck-move-by-capture.rs

#![feature(box_syntax,unboxed_closures)]

fn to_fn_mut<A,F:FnMut<A>>(f: F) -> F { f }
fn to_fn_once<A,F:FnOnce<A>>(f: F) -> F { f }

pub fn main() {
    let bar: Box<_> = box 3;
    let _g = to_fn_mut(|| {
        let _h = to_fn_once(move || -> isize { *bar }); //~ ERROR cannot move out of
    });
}