if expression grabs body without indentation

[edemaine]

Here's an input that I think compiles incorrectly:

=>
  extra.push state.start
  extra.push state.goal if state.goal
  {
    extra: new Set extra
  }

Intended compilation:

() => {
  extra.push(state.start)
  if (state.goal) extra.push(state.goal)
  return {
    extra: new Set(extra)
  }
}

Actual compilation:

() => {
  extra.push(state.start)
  return extra.push(state.goal((state.goal?
    ({extra: new Set(extra)}):void 0)))
}

Related to #1121

[STRd6]

This is fixed now, we may want to add a test to prevent regressions.