comment-normalize-varscomment-normalize-vars is a compiled Lisp function in `
newcomment.el'. (comment-normalize-vars &optional NOERROR) Check and set up variables needed by other commenting functions. All the `comment-*' commands call this function to set up various variables, like `comment-start', to ensure that the commenting functions work correctly. Lisp callers of any other `comment-*' function should first call this function explicitly.