function getLastLine(input) {
  var lines = [], nextLine;
  while ((nextLine = readNextLine(input)))
    lines.push(nextLine);
  if (!lines)
    throw new Error("No lines!");
  return lines[lines.length-1];
}

function lookup(cache, k) {
  var v;
  return k in cache ? cache[k] : (v = new Entry(recompute())) && (cache[k] = v);
}

function test(a, b) {
  if (!a && !b) {
    if (a);
    if (b);
  }
  if (!(a || b)) {
    if (a);
    if (b);
  }

  var x = new X();
  if(x){}
  if (new X()){}
  if((x)){}
  if(((x))){}
  if ((new X())){}

  x = 0n;
  if (x) // NOT OK
    ;
}

async function awaitFlow(){
    var v;

    if (y)
        v = await f()

    if (v) { // OK
    }
}

// semmle-extractor-options: --experimental