rust/tests/ui/nll/issue-27868.rs

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// Regression test for issue #27868
use std::ops::AddAssign;
struct MyVec<T>(Vec<T>);
impl <T> Drop for MyVec<T> {
fn drop(&mut self) {
println!("Being dropped.");
}
}
impl<T> AddAssign<T> for MyVec<T> {
fn add_assign(&mut self, _elem: T) {
println!("In add_assign.");
}
}
fn main() {
let mut vec = MyVec(vec![0]);
let mut vecvec = vec![vec];
vecvec[0] += {
vecvec = vec![];
//~^ ERROR cannot assign to `vecvec` because it is borrowed [E0506]
0
};
}