check-declare-scancheck-declare-scan is a compiled Lisp function in `
check-declare.el'. (check-declare-scan FILE) Scan FILE for `declare-function' calls. Return a list with elements of the form (FNFILE FN ARGLIST FILEONLY), where only the first two elements need be present. This claims that FNFILE defines FN, with ARGLIST. FILEONLY non-nil means only check that FNFILE exists, not that it defines FN. This is for function definitions that we don't know how to recognize (e.g. some macros).