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Using Rspec 1.2.6 and an expression of some desired behavior such as this:

it "should score 0" do
  score = 0
  score.should == 0
end

Will sometimes result in a ruby warning:

warning: useless use of == in void context

There was a little confusion as to why this warning was sometimes appearing.
It turns out that the warning appears when the command ruby -w is used to run the spec rather than spec.
This seems to be the case when rake is run for a non rails project, say a plugin.