message: Defeat the mir-opt=3 optimizer.
diff: @@ -40,8 +40,9 @@ pub fn main() {
  sleep(Duration::from_millis(1000));
  - //read
  - stack_var //~ ERROR Data race detected between Read on Thread(id = 1) and Write on Thread(id = 2)
  + // Read, the add 1 fixes -Z mir-opt-level=3 from removing the read via dest-prop and breaking
  + // the test.
  + stack_var + 1 //~ ERROR Data race detected between Read on Thread(id = 1) and Write on Thread(id = 2)
  });
  let j2 = spawn(move || {
  