```
MacBook-Pro-5:jruby robert.widmer$ bin/jruby -S rake spec:ruby:fast
MSPEC: {:compile_mode=>"OFF", :format=>"d", :spec_target=>":fast", :jruby_opts=>"-I. --dev", :jit_threshold=>20, :jit_max=>-1, :objectspace_enabled=>true, :thread_pooling=>false, :reflection=>false}
rm -rf rubyspec_temp
JAVA options: {:dir=>"/Users/robert.widmer/repos/jruby", :maxmemory=>"1024M", :resultproperty=>"spec.status.OFF", :fork=>"true", :failonerror=>"true", :classname=>"org.jruby.Main"}
$ /Users/robert.widmer/repos/jruby/bin/jruby -J-ea -J-Djruby.launch.inproc=false -J-Djruby.compile.mode=OFF -J-Djruby.jit.threshold=20 -J-Djruby.jit.max=-1 -J-Djruby.objectspace.enabled=true -J-Djruby.thread.pool.enabled=false -J-Djruby.reflection=false -J-Demma.coverage.out.file=target/test-results/coverage.emma -J-Demma.coverage.out.merge=true -J-Demma.verbosity.level=silent -J-XX:MaxMetaspaceSize=512M /Users/robert.widmer/repos/jruby/spec/mspec/bin/mspec-ci -f d :fast
jruby 9.2.9.0-SNAPSHOT (2.5.3) 2019-09-10 59c1bac Java HotSpot(TM) 64-Bit Server VM 25.201-b09 on 1.8.0_201-b09 [darwin-x86_64]
/Users/robert.widmer/repos/jruby/spec/ruby/core/module/attr_spec.rb:38: warning: optional boolean argument is obsoleted
/Users/robert.widmer/repos/jruby/spec/ruby/core/module/attr_spec.rb:39: warning: optional boolean argument is obsoleted
/Users/robert.widmer/repos/jruby/spec/ruby/core/module/attr_spec.rb:59: warning: optional boolean argument is obsoleted
/Users/robert.widmer/repos/jruby/spec/ruby/core/module/attr_spec.rb:62: warning: optional boolean argument is obsoleted
/Users/robert.widmer/repos/jruby/spec/ruby/core/module/attr_spec.rb:89: warning: optional boolean argument is obsoleted
```