Lint/UselessAssignment ignores unused variable in multiple rescue case

[ojab]

Testcase for rubocop 0.24.1 (using Parser 2.2.0.pre.3, running on ruby 2.1.2 x86_64-darwin13.0):

def foo
  1 / 0
rescue RuntimeError => e
  puts 2
rescue
  puts e
end

or

def foo
  1 / 0
rescue RuntimeError => e
  puts 2
rescue => e
  1.times do
    puts e
  end
end

e is unused in rescue RuntimeError, but rubocop tells that no offenses detected.

[bbatsov]

I guess @yujinakayama will take a look at this.