That is fine- it is something from "TEurbo Basic" and implemented in APL , in a way.and is very useful, but it only works if you detect, during coding, when to deal with a problem due, often, to coding errors. What  is needed is an interrupt outside of J (as an interrupt optio may not be available-except through a command to windows to stop.(alt crtrl del).

I would like to know

Don


On 2020-11-26 8:54 p.m., HH PackRat wrote:
I figured out how to do what I wanted:
     . . .
     . . .
goto_stop.
     . . .
     . . .
label_stop.
)

The name "stop", of course, can be any label name you wish.  In
effect, this pattern can be used to "rem out" (remark out) any portion
of code that you don't want executed at a particular moment of
testing.  I presume, as well, that you could conceivably have more
than one of these pairs as long as the labels ("stop" in this case)
are different.  (However, I am by no means an expert in J concerning
the latter point.)

Harvey
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