Style/TrivialAccessors incorrectly suggests using attr_writer for a method that stores a block

[shepmaster]

class Foo
  def foo(&blk)
    @foo = blk
  end

  def thing
    @foo.call(1)
  end
end

f = Foo.new
f.foo { |x| x + 1 }
puts f.thing

Suggests:

/tmp/a.rb:4:3: C: Use attr_writer to define trivial writer methods.
  def foo(&blk)
  ^^^

I tried an attr_writer just in case, but it didn't work 😸 .

$ rubocop --version
0.29.1
$ ruby --version
ruby 2.1.5p273 (2014-11-13 revision 48405) [x86_64-darwin14.0]