Fix.describe

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Specs are built with this method.

@example 42 must be equal to 42
  describe(42) do
    it { MUST equal 42 }
  end

@param front_object [BasicObject] The front object.
@param options      [Hash]        Some options.
@param specs        [Proc]        The set of specs.

@raise [SystemExit] The result of the test.
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