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#![feature(nll)]
fn flatten<'a, 'b, T>(x: &'a &'b T) -> &'a T {
x
}
fn main() {
let mut x = "original";
let y = &x;
let z = &y;
let w = flatten(z);
x = "modified";
//~^ ERROR cannot assign to `x` because it is borrowed [E0506]
println!("{}", w); // prints "modified"
}
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