in reply to
Re^3: shift in list context buggy?
in thread shift in list context buggy?
Just for curisosity - you write:
shift is one of those keywords...
The "sub"-perldoc uses similar vague language:
Many built-in functions may be overridden
Finally, some built-ins (e.g. "exists" or "grep") can't be overridden
Is there a list somewhere of the built-ins that can and those that cannot be overridden or is "many" and "some" all that's documented?