[Jsource] stress test for J

[Raul Miller]

this tends to shut down J904 (and, on windows, without a stacktrace
nor error messsage):

try=: {{
  0!:0 y
}}

trys=: {{
 'nchars ntries'=. 3 >. 2{.x
 s=. 0
 for.i.ntries do.
  try. try y{~nchars?#y
   s=. s+1
  catch. catcht. end.
 end.
 s%ntries
}}

3 1e5 trys a.

FYI,

-- 
Raul
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