error: compilation successful
  --> $DIR/E0503.rs:11:1
   |
LL | / fn main() { #![rustc_error] // rust-lang/rust#49855
LL | |     let mut value = 3;
LL | |     let _borrow = &mut value;
LL | |     let _sum = value + 1; //~ ERROR E0503
LL | | }
   | |_^

error: aborting due to previous error