I just noticed that one of the lines of "parsing pythonish" code in
that post got
mangled in the web visible instance.  It should have said

shift=: leave`group`enter @. (level {:)

But @. got converted to the word 'at' followed by a space followed by a dot.

Also, in case it's not obvious, the domain of the function 'parse' is
indented text provided by the 0 :0 mechanism.  (And, only spaces
count as indentation in that implementation.)

--
Raul
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