function mutate() {}
function cond() {}

function Component(props) {
  let a = {};
  let b = {};
  let c = {};
  let d = {};
  while (true) {
    mutate(a, b);
    if (cond(a)) {
      break;
    }
  }

  // all of these tests are seemingly readonly, since the values are never directly
  // mutated again. but they are all aliased by `d`, which is later modified, and
  // these are therefore mutable references:
  if (a) {
  }
  if (b) {
  }
  if (c) {
  }
  if (d) {
  }

  mutate(d, null);
}
