and here's a link on proper code markdown with more info

• put this before the code: ```ruby
• (code goes here)
• put this after the code: ```

How did nashx90 format his comment so that his codeblock is separate?

You're trying to access an item from a list on null (which obviously won't work).

there is no line 10 in my code.

CW put some other stuff in that file, it's not precise.

My code is passing all the tests, but when I run an attempt I get the following exit error. What does this mean? The rb: line references are always the same - there is no line 10 in my code.

main.rb:10:in `list': undefined method `[]' for nil:NilClass (NoMethodError)
	from main.rb:21:in `block in <main>'
	from /runner/frameworks/ruby/cw-2.rb:55:in `block in describe'
	from /runner/frameworks/ruby/cw-2.rb:46:in `measure'
	from /runner/frameworks/ruby/cw-2.rb:51:in `describe'
	from main.rb:13:in `<main>'