Zipping binary data was not a good idea, but at least string "PK" doesn't come from the archived "random.bin". You can create another test `.zip' file by archiving a text file, to be sure. Paul On Tue, 13 Jul 2021 at 23:12, Paul Pogonyshev wrote: > $ emacs -Q random.zip > > 1. Switch to buffer "*scratch*" > 2. Type "P" (without quotes) > 3. Press M-/ > 4. Here it finds expansion "PK" from buffer "random.zip". Cycling > with M-/ finds a few more, which are more binary-like. > > On Tue, 13 Jul 2021 at 21:14, Lars Ingebrigtsen wrote: > >> Paul Pogonyshev writes: >> >> > Apparently not from tarballs anymore, but still e.g. from a `.zip' >> > archive. Though I have Emacs 27.1 here, not 28. >> >> I tried visiting a zip file here now (in Emacs 27.1), but I was unable >> to make dabbrev-expand expand to any of the strings in the raw zip file. >> >> Do you have a recipe, starting from "emacs -Q", to reproduce the bug? >> (Including a test zip file, I guess.) >> >> -- >> (domestic pets only, the antidote for overdose, milk.) >> bloggy blog: http://lars.ingebrigtsen.no >> >