Regexp literal options getting stripped

[zzak]

The examples from here are getting stripped, for example:

/abc/ == /abc/x #=> false
/abc/ == /abc/i #=> false
/abc/ == /abc/u #=> false
/abc/u == /abc/n #=> false

are becoming:

/abc/ == /abc/ #=> false
/abc/ == /abc/ #=> false
/abc/ == /abc/ #=> false
/abc/ == /abc/ #=> false

/cc documenting-ruby/ruby#20