can you tell us what the function is expected to do?
&> is an unboxing adverb
(a v) is a syntax error.  But perhaps an early version of J, it wasn't.


    On Friday, May 31, 2019, 2:00:00 p.m. EDT, Ulrich Vollert <[email protected]> 
wrote:  
 
 Hello,

I am reading „J: The natural language for analytic computing“ and on page 47 
the author defines an adverb

    incrby =: (&>) i.

which leads to a syntax error if I try to define it.

Any hint what is going on?

Regards,
Ulrich


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