lazyIncomplete

Answer the bundle trees that are waiting for a specific token to be parsed. These are organized as a map where each key is the A_String form of an expected token, and the corresponding value is the successor A_BundleTree representing the situation where a token matching the key was consumed.

This is only an authoritative map if an expand has been invoked since the last modification via methods like addPlanInProgress.

Return

A map from strings to bundle trees.