Accept bignums unambiguously in the syntax for object labels, lread.c. src/ChangeLog addition: 2011-12-03 Aidan Kehoe <kehoea@parhasard.net> * lread.c (read1): Don't wrap when reading expressions that use bignums as object labels, that can lead to ambiguity and it's not actually that hard to use parse_integer() to avoid it. tests/ChangeLog addition: 2011-12-03 Aidan Kehoe <kehoea@parhasard.net> * automated/lisp-reader-tests.el: Check that integer object labels (using the #N=... syntax) treat bignums as such, rather than as fixnums that have wrapped.