)load pkg
DUMPED 2019-04-17  08:26:32 (GMT-5) 
     User-defined command ]pkg installed. 
      ]pkg packages
 *: top-level load; +: loaded dependency; -: expunged dependency
              _                                                 
 Name         L  V  Prefix Path                                 
 ----         -  -  ------ ----                                 
 apl-packager *  0  pkg    /home/dalyw/apl-pkg-repo/apl-pkg     
 arg_parser   -  0  ap     /home/dalyw/apl-pkg-repo/arg_parser  
 assert       -  0  assert /home/dalyw/apl-pkg-repo/assert      
 cfg          -  0  cfg    /home/dalyw/apl-pkg-repo/cfg         
 export       -  0  export /home/dalyw/apl-pkg-repo/export      
 finance      -  0  fin    /home/dalyw/apl-pkg-repo/finance     
 fmt          -  0  fmt    /home/dalyw/apl-pkg-repo/fmt         
 import       -  0  import /home/dalyw/apl-pkg-repo/import      
 lex          -  0  lex    /home/dalyw/apl-pkg-repo/lex         
 lex1         -  0  lex1   /home/dalyw/apl-pkg-repo/lex1        
 prompt       -  0  prompt /home/dalyw/apl-pkg-repo/prompt      
 stat         -  0  stat   /home/dalyw/apl-pkg-repo/stat        
 unit_test    -  0  test   /home/dalyw/apl-pkg-repo/unit_test   
 utf8         -  0  utf8   /home/dalyw/apl-pkg-repo/utf8        
 utl          -  0  utl    /home/dalyw/apl-pkg-repo/utl         
 xml          -  0  xml    /home/dalyw/apl-pkg-repo/xml         
      ]pkg load unit_test
RANK ERROR
pkg⍙has_prefix[3]  z←(⎕IO+z=⍴id)⌷1 0\z←¯1+⌊/
                     ^          ^