Javadoc
The reduce-goto table (supplied by generated subclass). This
table is indexed by state and non-terminal number and contains
state numbers. States are indexed using the first dimension, however,
the entries for a given state are compacted and stored in adjacent
index, value pairs which are searched for rather than accessed
directly (see get_reduce()). When a reduce occurs, the handle
(corresponding to the RHS of the matched production) is popped off
the stack. The new top of stack indicates a state. This table is
then indexed by that state and the LHS of the reducing production to
indicate where to "shift" to.