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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