Depends on babel/babel#4999
test actual requires from useBuiltIns
Because this is an exec.js test, it will actually run all the requires so it would fail if it wasn't found? depends on require being defined in the fixtures since we do new Function.
Might fail on npm 2 if we don't require it explicitly though..
yep that happened (failing on npm 2)
only run on npm 3 for now