Oops. Never mind. That's an IBM-ism; not part of ISO APL.

On Sat, 2014-04-05 at 23:20 -0700, David B. Lamkins wrote:
> A suggestion:
> 
> For compatibility with APL2, reserve names beginning with t∆ and s∆. GNU
> APL should indicate that trace and stop control are unimplemented when
> attempting to set such names to anything other than a numeric vector or
> an empty vector.
> 
> 



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