Suppress rspec warnings
$ RUBYOPT=W0 ./bin/rspec spec/
...
$ RUBYOPT=W0 bundle exec rspec spec/
...
$ RUBYOPT=W0 rspec
...
$ RUBYOPT=W0 ...
...
$ RUBYOPT=W0 ./bin/rspec spec/
...
$ RUBYOPT=W0 bundle exec rspec spec/
...
$ RUBYOPT=W0 rspec
...
$ RUBYOPT=W0 ...
...
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