Setting a breakpoint from within the Ruby debugger

gistfile1.txt

$ cat test.rb 
class Foo
  def bar
    'baz'
  end
end

debugger
Foo.new.bar

$ be rdebug test.rb
[-4, 5] in /Users/dev/Dropbox/repos/atlas/test.rb
=> 1  class Foo
   2    def bar
   3      'baz'
   4    end
   5  end
/Users/dev/Dropbox/repos/atlas/test.rb:1
class Foo
(rdb:1) c
[3, 12] in /Users/dev/Dropbox/repos/atlas/test.rb
   3      'baz'
   4    end
   5  end
   6  
   7  debugger
=> 8  Foo.new.bar
/Users/dev/Dropbox/repos/atlas/test.rb:8
Foo.new.bar
(rdb:1) break Foo.bar
Breakpoint 1 at Foo::bar
(rdb:1) c
Breakpoint 1 at Foo:bar
[-3, 6] in /Users/dev/Dropbox/repos/atlas/test.rb
   1  class Foo
=> 2    def bar
   3      'baz'
   4    end
   5  end
   6  
/Users/dev/Dropbox/repos/atlas/test.rb:2
def bar
(rdb:1) c

$