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// run-pass
// Tests that unary structs can be mutably borrowed.
struct Empty;
trait T<U> {
fn next(&mut self) -> Option<U>;
}
impl T<isize> for Empty {
fn next(&mut self) -> Option<isize> { None }
}
fn do_something_with(a : &mut dyn T<isize>) {
println!("{:?}", a.next())
}
pub fn main() {
do_something_with(&mut Empty);
}
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