Function parameter default values must not refer their own local scope (es spec violation)

[falsandtru]

Babel works correctly.

TypeScript Version: master

Code

f();

function f(o = {g}) {
  return console.log(o.g());

  function g() {
    return 1;
  }
}

function g() {
  return 0;
}

Expected behavior:

$ node built/local/tsc.js index.ts && node index.js
0
$ node index.ts
0

Actual behavior:

$ node built/local/tsc.js index.ts && node index.js
1
$ node index.ts
0

[falsandtru]

https://babeljs.io/repl/#?babili=false&browsers=&build=&builtIns=false&code_lz=GYCglA3AUFwK4DsDGAXAlgewQAlB7AvNgN4DmAvmCVNtgE4CmKcdOSWAzhgDYMB03DKRAY-wsJBi14ydFmzjqtWo2atsARmi1yUXbESpMORcRr0mLHAAZo5IA&debug=false&circleciRepo=&evaluate=true&lineWrap=true&presets=es2015%2Creact%2Cstage-2&prettier=false&targets=&version=6.26.0

[mhegazy]

Duplicate of #2584