Ruby: Can lambda function parameters have default values?

I want to do something similar to this:

def creator()
        return lambda { |arg1, arg2 = nil|
                puts arg1
                if(arg2 != nil)
                        puts arg2
                end
        }
end

test = creator()

test('lol')
test('lol', 'rofl')

I get a few syntax errors:

test.rb:2: syntax error
        return lambda { |arg1, arg2 = nil|
                                 ^
test.rb:3: syntax error
test.rb:7: syntax error
test.rb:14: syntax error

is this possible in ruby? i want to set a default value for a parameter to a lambda function