zuse: fix +apt jet parent not found
=/ b ;;((tree [key=key val=value]) a)
?> (apt:((on key value) ord) b)
b
+::
+::
++ ordered-map on
:: +on: treap with user-specified horizontal order, ordered-map
::
::
++ apt
~/ %apt
- =| [l=(unit key) r=(unit key)]
|= a=(tree item)
- ^- ?
+ =| [l=(unit key) r=(unit key)]
+ |- ^- ?
:: empty tree is valid
::
?~ a %.y
