;;
;; OPS either has the structure of `c-operators', is a single
;; group in `c-operators', or is a plain list of operators.
- ;;
+ ;;
;; OPGROUP-FILTER specifies how to select the operator groups. It
;; can be t to choose all groups, a list of group type symbols
;; (such as 'prefix) to accept, or a function which will be called