You cannot place a comment inside another comment. If you try, you find that the inner comment's first double-quotation mark terminates the outer comment, and your Smalltalk compiler misconstrues your intentions, and sees the inner comment uncovered:
" <-----------------------------------* | First quotation mark of outer First part of outer comment ... | comment matches first | quotation mark of inner " -------------------------------------* comment Inner comment ... <---------------------- Inner comment is exposed " -------------------------------------* | Second quotation mark of Second part of outer comment ... | inner comment matches second | quotation mark of outer " <-----------------------------------* comment