Info-prev-reference-or-link is a compiled Lisp function in `info.el'.

(Info-prev-reference-or-link PAT PROP)

Move point to the previous pattern-based cross-reference or property-based link.
The previous cross-reference is searched using the regexp PAT, and the previous link
is searched using the text property PROP. Move point to the closest found position
of either a cross-reference found by `re-search-backward' or a link found by
`previous-single-char-property-change'. Return the new position of point, or nil.