lazy
Answer a map used by the CheckArgument instruction to quickly eliminate arguments that are forbidden by grammatical restrictions. The map is from each restricted argument bundle to the successor bundle tree that includes every bundle that is allowed when an argument is an invocation of a restricted argument bundle. Each argument bundle that is restricted by at least one parent bundle at this point (just after having parsed an argument) has an entry in this map. Argument bundles that are not restricted do not occur in this map, and are instead dealt with by an entry in the lazyActions map.
This technique leads to an increase in the number of bundle trees, but is very fast at eliminating illegal parses, even when expressions are highly ambiguous (or highly ambiguous for their initial parts).
This is only an authoritative map if an expand has been invoked since the last modification via methods like addPlanInProgress.
Return
An A_Map from potential child A_Bundle to the successor A_BundleTree that should be visited if an invocation of that bundle has just been parsed as an argument.