Long chain of << expressions doesn't get cut off

e.g.

```ruby
long_name << longer_name << really_long_name << really_longer_name << even_longer_name << and_a_final_long_name
```

Expected:

```ruby
long_name << longer_name << really_long_name << really_longer_name <<
  even_longer_name << and_a_final_long_name
```