WORDS-OF TRY [BREAK] crashes

[rebolbot]

Submitted by: meijeru

This is one of the cases where TRY yields a "special" error value (code < 100). WORDS-OF TRY [1 / 0] works normally.

^{CC - Data [ Version: alpha 97 Type: Bug Platform: All Category: Error Handling Reproduce: Always Fixed-in:alpha 98 ]}

[rebolbot]

Submitted by: BrianH

This is a side effect of bug #1509. The unwind values don't have words, so WORDS-OF shouldn't work on them. However, the unwind values should never be passed as an argument to the function in the first place; they should propagate instead. So there is no problem with the behavior of the function itself: The error is in the call to the function, as done by DO.

[rebolbot]

Submitted by: Ladislav

"However, the unwind values should never be passed as an argument to the function in the first place;" - certainly, triggered unwinds shall not be in the "Rebol value space", not being "normally manipulable" by any Rebol function, and existing only as "ghosts". If wished, untriggered unwinds can be defined as "regular Rebol values", but it probably isn't necessary.

[rebolbot]

Submitted by: BrianH

There is no such thing as an untriggered unwind value as far as REBOL code is concerned. You can't make an unwind value without triggering it. And any code which is able to treat an unwind value as if it were an untriggered error! value is a major security hole, which should be reported here. See #1004, #1509, #1515 and #1519 for other examples of that security hole.

[rebolbot]

Submitted by: Carl

In A98 it no longer crashes, but returns a new error indicating that such usage is not valid.

[rebolbot]

Submitted by: Ladislav

While not causing a crash now, the behaviour is still incorrect. See #1509

[rebolbot]

Submitted by: BrianH

#1509 is now fixed, so we can consider this one fixed as well.