Revert "singleton class is yielded"
Revert "singleton class is yielded"

* This reverts commit 73496fa71b64769699f3f67a6601e3a11190878d.
* Better fix coming.

ruby/spec,kachick/rubyspec,BanzaiMan/rubyspec,wied03/rubyspec,ruby/rubyspec,sgarciac/spec,ruby/rubyspec,nobu/rubyspec,nobu/rubyspec,wied03/rubyspec,kachick/rubyspec,sgarciac/spec,sgarciac/spec,eregon/rubyspec,eregon/rubyspec,BanzaiMan/rubyspec,eregon/rubyspec,ruby/spec,nobu/rubyspec,ruby/spec,kachick/rubyspec,wied03/rubyspec