#'custom-add-to-group: warn if GROUP is nil. 2011-03-24 Aidan Kehoe <kehoea@parhasard.net> * custom.el (custom-add-to-group): Warn if adding an option to the nil group; this is usually an error on the part of the programmer. * cmdloop.el (suggest-key-bindings): Specify a group for this variable, it didn't previously have one.