1. Add this line to the CoffeeScript section of languages.json: `"blockComment": ["###", "###"],` 2. Open a .coffee file with these contents: ``` foo = 42 bar = true baz = "hello" number = -42 if bar square = (x) -> x * x ``` 1. Select the middle 3 lines and Toggle Block Comment 2. Immediately Toggle Block Comment again 3. Undo back to clean state 4. Repeat step 3 5. Select all the lines, including the `###` lines, _then_ Toggle Block Comment again 6. Undo back to a clean state 7. Select just one line (without including newlines) and Toggle Block Comment 8. Either (a) immediately toggle again, or (b) re-select the whole line to include delimiters and then toggle Result: 4 - closing delimiter isn't removed 7 - comment is wrapped in a second pair of `###` lines 10 - one "#" is removed from the opening `###`, but nothing else changes