Ruby 2.6: Add complementary spec for refinements and Kernel#public_send
Ruby 2.6: Add complementary spec for refinements and Kernel#public_send

ruby/spec,ruby/spec,ruby/spec,nobu/rubyspec,nobu/rubyspec,eregon/rubyspec,ruby/rubyspec,eregon/rubyspec,ruby/rubyspec,eregon/rubyspec,nobu/rubyspec