C:\>splain
C:\Perl\bin/splain.bat: Reading from STDIN
Attempt to bless into a reference
Attempt to bless into a reference (#1)
    (F) The CLASSNAME argument to the bless() operator is expected to be
    the name of the package to bless the resulting object into. You've
    supplied instead a reference to something: perhaps you wrote

        bless $self, $proto;

    when you intended

        bless $self, ref($proto) || $proto;

    If you actually want to bless into the stringified version
    of the reference supplied, you need to stringify it yourself, for
    example by:

        bless $self, "$proto";