buffer_visited_file_modtime 5941 src/fileio.c     return buffer_visited_file_modtime (current_buffer);
buffer_visited_file_modtime 4760 src/lisp.h     extern Lisp_Object buffer_visited_file_modtime (struct buffer *);
buffer_visited_file_modtime  221 src/undo.c     		  Fcons (Fcons (Qt, buffer_visited_file_modtime (base_buffer)),