[Jprogramming] Line numbers on error (J5)

[Sprague, Webb (OFM)]

> 
> Once you hit an error, you can get names and line numbers
>    13!:13''
> 
> Names are in column 0, line numbers are in column 2,
> the innermost name will be row 0.

This works, in the sense that it produces output, but I haven't a clue
how to interpret it.  I will be OK without it, but I was hoping for
something that looked like a "stack trace",  like 

func1 , line 10 
->	func2, line 89
-> ->		func3, line 800: Error: can't find file "Blah blah blah"

> 
> FYI,
> 
> --
> Raul
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