It looks like a scalar/array/hash but if you try to evaluate it an exception is thrown, with "confess" stacktrace. For help debugging data structure problems. References to it are safe though.
INSTALLATION
To install this module type the following:
perl Makefile.PL
make
make test
make install
DEPENDENCIES
This module requires these other modules and libraries:
Carp
COPYRIGHT AND LICENCE
2002, 2006 David Nicol. GPL or AL.