completion-pcm--find-all-completionscompletion-pcm--find-all-completions is a compiled Lisp function in `
minibuffer.el'. (completion-pcm--find-all-completions STRING TABLE PRED POINT &optional FILTER) Find all completions for STRING at POINT in TABLE, satisfying PRED. POINT is a position inside STRING. FILTER is a function applied to the return value, that can be used, e.g. to filter out additional entries (because TABLE might not obey PRED).