This directory contains test classes for 
derived datatypes. In fhe following the number
of nodes needed and some explanations are annotated:


class                  no. of nodes (min-max)           annotation
------------------------------------------------------------------
hvec                        1-inf                       not impl.
lbub2                       1-inf                       not impl.
lbub                        1-inf                       not impl.
pack                        1-inf                       
type_size                   1-inf                       
zero1                       1-inf                       not impl.
zero5                       1-inf                       not impl.