System.CallStack - Manhunter07/MFL GitHub Wiki
function CallStack: array = \built-in\
The CallStack function in the System package returns the current outside-itself function call stack at the moment of evaluation. It is an empty array ([]) if called from outside a function and contains the full call stack as a [reference] array if called from inside. The stack order is from the outside to the inside with the most recent call last. Each object from the call stack is returned as a reference inside the returned array (if possible, otherwise Nil is returned) with the exception of the CallStack function itself which is left out.
You may use the Caller function helper to get the caller function (or Nil) of the current function.