error: compilation successful
  --> $DIR/feature-gate-nll.rs:13:1
   |
LL | / fn main() { #![rustc_error] // rust-lang/rust#49855
LL | |     let mut x = 33;
LL | |
LL | |     let p = &x;
LL | |     x = 22; //~ ERROR cannot assign to `x` because it is borrowed [E0506]
LL | | }
   | |_^

error: aborting due to previous error