condition—a condition of type cell-error.
name—an object.
Returns the name of the offending cell involved in the situation represented by condition.
The nature of the result depends on the specific type of condition.
For example,
if the condition is of type unbound-variable, the result is
the name of the unbound variable which was being accessed,
if the condition is of type undefined-function, this is
the name of the undefined function which was being accessed,
and if the condition is of type unbound-slot, this is
the name of the slot which was being accessed.
cell-error, unbound-slot, unbound-variable, undefined-function, Section 9.1 (Condition System Concepts)