in reply to Re^3: Mixed lvalue/rvalue sub function
in thread Mixed lvalue/rvalue sub function

If you like to start using lvalue function, you should know that they are still marked as experimental (at least in Perl 5.8).

perlsub says:

WARNING: Lvalue subroutines are still experimental and the implementation may change in future versions of Perl.

In Section Seekers of Perl Wisdom