use bigint;

##</code><code>##

$ perl -Mbigint -le 'print log(2)'
Can't use an undefined value as an ARRAY reference at /usr/lib/perl5/5.8.8/Math/BigInt/Calc.pm line 1338.

##</code><code>##

$ perl -Mbigint=t -le 'print log(2)'                           MBI import Math::BigInt::Trace :constant
MBI new '2' => '2' (Math::BigInt::Trace)
Can't use an undefined value as an ARRAY reference at /usr/lib/perl5/5.8.8/Math/BigInt/Calc.pm line 1338.