Non-filename completions containing slashes and -o filenames

Hello, Apologies if this is not an appropriate list to post a question like this (pointers elsewhere welcome), but here goes: I'm trying to figure out how to do the right thing with non-filename completions containing slashes in a function that was passed to complete along with -o filenames.

M-. rings bell if empty

Type "# RET ESC ." Bash replies with a ^G Wouldn't it be more polite to just do nothing, instead of waking up the neighbors? $ expr 2 + 2 4 $ #e=mcHammer <-here I typed ESC # $ e=mc<-here I type ESC . ESC . in order to get the "2", but after the first ESC . I must endure the ^G slap in th