Reason: [refmt] Keep existing spacing between statements

[kyldvs]

Input

let x = 1;
let y = 2;

let z = 3;

module A = {
  let x = 1;
  let y = 2;


  let z = 3;
};

Desired output

let x = 1;
let y = 2;

let z = 3;

module A = {
  let x = 1;
  let y = 2;

  let z = 3;
};

Actual output

let x = 1;

let y = 2;

let z = 3;

module A = {
  let x = 1;
  let y = 2;
  let z = 3;
};

Similar prettier example for reference: https://goo.gl/jVGeah

[jordwalke]

@IwanKaramazow had some ideas about how to do this by looking at the binding original locations. I suggested maybe using ppx attributes to encode them but I realized that's probably not the best idea and his original approach is better.

[IwanKaramazow]

I'll make this a priority, with a bit of luck I can land this next week.

[jaredly]

This is done!