Make sure (format "%b" 0) is non-zero length, print.c src/ChangeLog addition: 2010-10-25 Aidan Kehoe <kehoea@parhasard.net> * print.c (ulong_to_bit_string): If printing zero, actually print a zero, don't return the empty string. tests/ChangeLog addition: 2010-10-25 Aidan Kehoe <kehoea@parhasard.net> * automated/lisp-tests.el: Test format strings with %b, too.