Can't recognize lines in block

Especially for sinatra applications. Here's a minimal example demonstrating the problem:

app.rb

require "sinatra"

class App < Sinatra::Base
  get '/' do
    i = 1
    i = 1
    i = 1
    i = 1
    i = 1
    i = 1
    i = 1
    i = 1
    i = 1
    i = 1
    i = 1
    i = 1
    i = 1
    i = 1
    i = 1
    i = 1
    i = 1
    i = 1
    i = 1
    i = 1
    i = 1
    'hi'
  end
end

test.rb

require "test/unit"
require "rack/test"
require "cover_me"
require_relative "app"

CoverMe.config do |c|
  c.project.root = File.expand_path File.dirname(__FILE__)
  c.file_pattern = /app\.rb/
end
at_exit &(CoverMe.method :complete!)

class TestApp < Test::Unit::TestCase
  include Rack::Test::Methods

  def app
    App
  end

  def test_1
    get '/'
    assert_equal 'hi', last_response.body
  end
end

The result shows only 3 lines are covered, all lines in the block are not covered.

Environment:

• ruby 1.9.2p180 (2011-02-18 revision 30909) [x86_64-darwin10.7.1]
• sinatra (1.2.6)
• rack-test (0.6.0)
• cover_me (1.0.0)

Reproduce the report with the app.rb and test.rb examples, using the listed Sinatra, rack-test, and CoverMe versions. Start by tracing how CoverMe processes the Sinatra route block and compare its reported coverage with the repeated assignments. Done means the lines inside the block are recognized and reported with the expected coverage.