$ /usr/local/perl/5.14.2/bin/perl -we '$v=""; vec($v,4060380287,1)=1'
Negative offset to vec in lvalue context at -e line 1.
$ /usr/local/perl/5.15.8/bin/perl -we '$v=""; vec($v,4060380287,1)=1'
Negative offset to vec in lvalue context at -e line 1.