scan
scan(char *buf, int len, int filter, int cap, int old, void (*proc)(),
scan(s)
scan(char **sp)
scan(char **start_p)
scan(lcollection_t *lcol, int64_t excess)
scan(tok_kind expect, token *tokp)
scan(argn)
scan(int ch, const char *str, const char *estr)