Attempting to copy/save a referents-allowed buffer stream opened in an outer nested-referents scope.
#6065 Run-time catchable error
Attempting to copy/save a referents-allowed buffer stream opened in an outer nested-referents scope.
Explanation
It is not allowed to copy/save a stream shelf that contains an item
that was open with referents allowed in an outer referents scope. The
rationale is to avoid the need to resolve referents from outer referent
scopes.