I can give more information on these "wrong" warnings, first reported with 
jplayground


cocurrent 'z'

isNoun =: (0 = 4!:0 ::0:)@:<

isgerund =: 0:`(0 -.@e. 3 : ('y (5!:0)';'1')"0)@.(0 < L.) :: 0:

ar =: 1 : '5!:1 <''u'''

ari =: 1 : 'if. isNoun ''u'' do. if. (isgerund -.@+. '''' -: ]) m do. m ar 
else. m end. else.u ar end.'

ti =: ari ` ari NB. different from doubleadverb2.ijs: '' is passed to ` . boxed 
non gerund is ar'd ie a:`u

ti2 =: ar ` ar

F0 =: 1 : 'u ti ti `: 6'

v2c =: 1 : '[. u ].'

F1 =: 1 : '(ti u) ti (''''ti) `:6'

F2 =: 1 : 'ti ti u `: 6'

t =: t.''


Warnings get generated when the ari function is used in modifier trains.  ari 
is an adverb that returns a noun on all paths.


 + (` ti `) - NB. 4 warnings.

 + (ti2 ti2 ti2) - NB. 0 warnings.  no ari code at all.


 +/ % (2 : 'ti' ti) #  NB. 2 warnings
+/ % (2 : '`' ti) # NB. 0 warnings

 +/ % ((2 : 'ti2') ti) # NB. no warnings.  possibly because ti executes ari at 
end rather than intermediate result in a modifier train?

+/ % (F1 t. '') # NB. or (F1 t).  3 warnings.
+/ % (v2c t. '') #  NB. 0 warnings.









On Saturday, April 9, 2022, 03:03:18 p.m. EDT, Henry Rich 
<[email protected]> wrote: 





It has long been known that J will execute many meaningless sentences 
without warning.  Examples are

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