Style/Encoding AutoCorrect with EnforcedStyle: when_needed goes into an infinite loop

[hesalx]

rubocop version: master at 9732d37
0.35.1 (using Parser 2.3.0.pre.6, running on ruby 2.3.0 x86_64-linux)

.rubocop.yml:

AllCops:
  TargetRubyVersion: 2.3

Style/Encoding:
  Enabled: true
  EnforcedStyle: when_needed

My actions:

$ bundle exec rubocop 
file.rb:1:1: C: Unnecessary utf-8 encoding comment.
# encoding: utf-8
^

$ bundle exec rubocop --auto-correct

Expected behaviour: line # encoding: utf-8 is deleted from all files.
Actual behaviour: infinite addition of # encoding: utf-8 lines to the first encountered file.

[hesalx]

Just a little thought: for TargetRubyVersion >= 2.0 this cop should always report encoding comment as unnecessary regardless of EnforcedStyle.

[pasha]

Having similar issue.
using latest version 0.37.2
ruby 2.2.3p173

Style/Encoding:
  Description: 'Use UTF-8 as the source file encoding.'
  StyleGuide: 'https://github.com/bbatsov/ruby-style-guide#utf-8'
  EnforcedStyle: when_needed
  Enabled: true