Inheritance with multiple Citrus grammars

Gemfile

source :rubygems
gem "citrus"
gem "rspec"

spec.rb

require 'rubygems' unless RUBY_VERSION >= "1.9"
require 'citrus'

Citrus.eval <<-EOF
    grammar WithPar
      rule function
        /[a-z]/+ parens
      end
      rule parens '()' end
    end
    grammar WithBrack
      include WithPar
      root function
      rule parens '{}' end
    end
EOF

describe "inheritance in Citrus" do
  
  it 'WithPar should use parentheses' do
    WithPar.parse("hello()").should_not be_nil
  end
  
  it 'WithBrack should not allow parentheses' do
    lambda{ WithBrack.parse("hello()") }.should raise_error(Citrus::ParseError)
  end
  
  it 'WithBrack should use brackets' do
    WithBrack.parse("hello{}").should_not be_nil
  end
  
end