\begin{code}
zapLamIdInfo :: Id -> Id
-zapLamIdInfo id = maybeModifyIdInfo zapLamInfo id
+zapLamIdInfo id = maybeModifyIdInfo (zapLamInfo (idInfo id)) id
-zapDemandIdInfo id = maybeModifyIdInfo zapDemandInfo id
+zapDemandIdInfo id = maybeModifyIdInfo (zapDemandInfo (idInfo id)) id
\end{code}