add example which specs behavior of Proc#for_define_method when procs @ruby_method is set
add example which specs behavior of Proc#for_define_method when procs @ruby_method is set

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