Looking into the source of List::MoreUtils, I find: 
require Carp;
Carp::croak "some message";

[download]
That only works if Carp was already loaded. In older versions of Perl, there was a common pragma (vars?) that loaded it, but that no longer is loaded in 5.10.

Hence the error. And another reason to not use List::MoreUtils.

In reply to Re^3: Beware List::MoreUtils natatime()! by JavaFan
in thread Beware List::MoreUtils natatime()! by samtregar

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