gistfile1.rb

# puts (s="puts (s=%s)%%s.dump")%s.dump

require 'rspec'
RSpec::Core::Runner.disable_autorun!

describe "foo" do
  it "bar" do
  end
  it "baz", :banane => true do
  end
end

RSpec.configure do |config| config.filter = {banane: true}; end
RSpec::Core::Runner.run([], $stderr, $stdout)