cucumber #672 repro

# bug 672 repros when cucumber is called with line number on feature below, e.g.:
$ cucumber features/failing_before_hook_in_background.feature:4

# env.rb

Before('@bug672') do |scenario|
  raise Exception, "Exception from before hook tagged @bug672"
end

# features/failing_before_hook_in_background.feature
@bug672
Feature: Failing before hook example

  Background:
    Given this step works
    And this step works

  Scenario: failing background
    Then this step works