newRPL: [UPDATED April 27-2017] Firmware for testing available for download

[The Shadow]

In other news, I've been trying to determine the locked/unlocked state of a variable programmatically using the following:

<< DUP RCL SWAP IFERR STO THEN DROP2 1 ELSE 0 END >>

This works fine on unlocked variables, returning a 0 as expected; but when I try it on a locked variable, it throws a 'STO: Bad argument count' error. Even granted there's such an error, which there shouldn't be, why isn't the IFERR handling it?

(How about a LOCK? or LVARS command? LOCK? would do what my above program does, testing a single variable; LVARS would return a list of all locked variables in the current directory. Wouldn't need both, one or the other would be sufficient.)