It can execute and return 0 on j602.
I tested on j807, the value error was already there, so that
the behavior alredy changed at that version or earlier.
JVERSION
Engine: j807/j64/linux
Release-e: commercial/2019-06-10T13:48:44
Library: 8.07.26
Platform: Linux 64
Installer: unknown
InstallPath: /usr/share/j/8.07
Contact: www.jsoftware.com
0!:0<'/home/bill/a1.ijs'
|value error: isboxed
| isboxed y
0!:101<'/home/bill/a1.ijs'
cocurrent 'loc'
dec=: [
isboxed=: 32=3!:0
enc=: 3 : ('1 enc y';':';'isboxed y')
cocurrent 'z'
test=: 0 1&enc_loc_ : enc_loc_ :. (1 1&dec_loc_ : dec_loc_)
testi=: test_z_^:_1
cocurrent 'base'
dbr 1
0:&.testi ''
|value error: isboxed
| isboxed y
In j807 the dbr 1 can print the value error message, but no
suspension.
Mon, 30 Sep 2019, Henry Rich написал(а):
> This was deep. The system error was easy to fix for the next release (a
> missing NUL terminator to a string).
>
> You still get value error on isboxed, because u&.v is actually processed as
> u&.(v f.) when v contains names. Applying f. to a locative such as enc_loc_
> removes the locative, thus the resulting verb executes in base. I would
> have to study this quite a while before I changed something so deep in the
> system.
>
> When you run the code with dbr 1, it doesn't go into suspension when it hits
> the value error. This is because it detects the error on the name before it
> enters the branch for debugging the execution of the name. I'll put that on
> the bug list.
>
> Henry Rich
>
> On 9/29/2019 10:52 AM, Kirk Iverson wrote:
> > I've been giving 9.01 beta-k a bit of an exercise and have
> > come across the following:
> >
> > cocurrent 'loc'
> > dec=: [
> > isboxed=: 32=3!:0
> > enc=: 3 : ('1 enc y';':';'isboxed y')
> > cocurrent 'z'
> > test=: 0 1&enc_loc_ : enc_loc_ :. (1 1&dec_loc_ : dec_loc_)
> > testi=: test_z_^:_1
> > cocurrent 'base'
> > dbr 1
> > 0:&.testi ''
> > |system error
> > JVERSION
> > Engine: j901/j64/windows
> > Beta-k: commercial/2019-09-16T17:06:30
> > Library: 9.01.10
> > Platform: Win 64
> > Installer: J901 install
> > InstallPath: c:/users/kbi/j901
> > Contact: www.jsoftware.com
> >
> >
> > I have seen variants of the problem as I tried to isolate it, with
> > one symptom being a value error trying to find <isboxed> while <enc>
> > was running. In that case, the current locale wasn't <loc>, which it
> > had been in earlier versions of J. Having dbr 1 set also appears to
> > be a factor in getting the system error.
> >
> > /K
> > ----------------------------------------------------------------------
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>
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