gistfile1.txt

/* @flow */
type T1 = {x : number};
type T2 = {y : number};
type T3 = T1 & T2;

function mergeAndDoStuff(t1 : T1, t2 : T2) : T3 {
  const result = Object.assign({}, t1, t2);
  console.log(result.info.toString()); // at one time, T1 contained info, but it was removed
  return result;
}