If you run PDL on Windows, could you try building and running tests on the 
fix_warp2d branch?  It passes tests on my Mac, but is failing our automated 
test suite on AppVeyor using Strawberry Perl 5.26.1.1.  In particular 
t/image2d.t is failing with:

> Free to wrong pool 39a0f0 not 8127396a153af4d at 
> C:\projects\pdl\blib\lib/PDL/Image2D.pm line 1476, <DATA> line 207.

This looks to me like a memory issue.  If you know how to debug these on 
Windows, I would appreciate it!  The pool numbers will be different on your 
machine.  Line 1476 of Image2D.pm is where _warp2d_int gets called, I think.  
This is the first time that ANY warp2d-related tests have existed, so it's 
maybe not too surprising that they're failing on some platforms.  I was able to 
put Strawberry+PDL edition on a Windows computer and verified the error, so 
it's not a problem with AppVeyor.  I have not tried ActiveState or Cygwin.

thanks,
Derek
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