Posting on behalf of dogbert17: ----------------------------
I believe that I have encountered the same bug under different circumstances. With the help of hackedNODE and others on #perl6 it seems as if the problem described below also suffers from the wrong multi candidate being called. In fact, it seems to happen with any sub with int/Int multis. dogbert@dogbert-VirtualBox ~ $ perl6 -v This is Rakudo version 2016.09-122-gc6c0e69 built on MoarVM version 2016.09-13-g34c375a implementing Perl 6.c. # the problem dogbert@dogbert-VirtualBox ~ $ perl6 -e 'my int $i = 2482111348; say $i; $i = $i div 2; say $i' 2482111348 -906427974 # run the same snippet with --optimize=0 dogbert@dogbert-VirtualBox ~ $ perl6 --optimize=0 -e 'my int $i = 2482111348; say $i; $i = $i div 2; say $i' 2482111348 1241055674 # also works with --optimize=1 dogbert@dogbert-VirtualBox ~ $ perl6 --optimize=1 -e 'my int $i = 2482111348; say $i; $i = $i div 2; say $i' 2482111348 1241055674 A discussion wrt this particular problem can be found here: https://irclog.perlgeek.de/perl6/2016-10-04#i_13335782
