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export pdl() only from perl PDL
use PDL qw(pdl);

use PDL qw();

Can't call method "new" on unblessed reference at Basic/Core/Core.pm.PL (i.e. PDL::Core.pm) line 934.

{
     require PDL;
     pdl();
}

use PDL::Core;
   use PDL::Ops;
   use PDL::Primitive;
   use PDL::Ufunc;
   use PDL::Basic;
   use PDL::Slices;
   use PDL::Bad;
   use PDL::MatrixOps;
   use PDL::Math;
   use PDL::Version;
   use PDL::IO::Misc;
   use PDL::IO::FITS;
   use PDL::IO::Pic;
   use PDL::Lvalue;

use PDL::Core '';
use PDL::Ops '';
use PDL::Primitive '';
use PDL::Ufunc '';
use PDL::Basic '';
use PDL::Slices '';
use PDL::Bad '';
use PDL::Version;
use PDL::Lvalue;