[Bug-apl] Negative shape arguments

[Daniel H. Leidisch]

Hello!

I think these should be domain errors:

      ⍳¯1
      ¯1⍴1

Reduction on their results crashes GNU APL:

      +/¯1⍴1

==============================================================================
Assertion failed: 0
in Function:      init
in file:          Cell.cc:47
[…]

I'm on r136.


Regards,

Daniel