Add spec for inheritance of Interrupt
Add spec for inheritance of Interrupt

See also https://github.com/ruby/spec/pull/298#discussion_r81414942

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