if-else does not work properly (regression)

Created by: skylerberg

Running this script:

if a == a
  echo true a == a
  if b != b
    echo true b != b
  else
    echo false b != b
    if 3 > 2
      echo true 3 > 2
    else
      echo false 3 > 2
    end
  end
else
  echo false a == a
end

Results in:

true a == a
false b != b
No comparison operator
Syntax error: else found with no previous if
false a == a
Syntax error: end found outside of a block

This is really wrong.

I think this answer is to move this into the grammar, but it is not going to be easy: https://github.com/redox-os/ion/issues/119. Also, https://github.com/redox-os/ion/issues/66 could have prevented this regression.