The calls a call saw, in order, each saw_of replaced (recursively) by the
entries of the call it names. Throws SawUnknown when they cannot be
known: not-recorded (its record has no saw), missing-call,
unknown-key (an entry no reader knows), saw-cycle.
The calls a call saw, in order, each
saw_ofreplaced (recursively) by the entries of the call it names. ThrowsSawUnknownwhen they cannot be known:not-recorded(its record has nosaw),missing-call,unknown-key(an entry no reader knows),saw-cycle.