Re: [Bug-apl] Workspace Migration Error

[Mike Duvos]

Hi Jürgen,

I suspect APL2 is trying to optimize the reconstruction of vars stored in the workspace as arithmetic progression vectors. 

Here is the OUT file.

Regards,

Mike

On Mon, Aug 31, 2015 at 5:53 AM, Juergen Sauermann <address@hidden> wrote:

Hi Mike,

it would help if you could provide the file OUT for which the )IN command fails.

Generally speaking, )IN is an very dangerous command because it executes (⍎)
the records in the file in order to reconstruct a workspace, and it will do whatever
the producer of the file wants to do (with your permissions).

For that reason, GNU APL does not use execute (⍎) in order to implement )IN (or 2 ⎕TF),
but has a special parser to process the records. That special parser is limited in what APL functions
it allows. Unfortunately there exist no specification as to which APL functions can be used in 2 ⎕TF

The pattern below ('M←¯12-⎕IO-⍳25') has not occurred before, so the parser didn't know.
But once I have the file, I can add and test it.

/// Jürgen

On 08/31/2015 05:25 AM, Mike Duvos wrote:

[IBM APL2]

       )CLEAR
CLEAR WS
      ⎕IO←0
      M←¯12+⍳25
      )OUT OUT
      

[GNU APL]

      )IN OUT
ERROR: inverse 2 ⎕TF failed for 'M←¯12-⎕IO-⍳25

I'm assuming the error here is on the GNU APL side of the transaction, as APL2 has been around for a while, and people would have complained.

                                                     ;

OUT.atf
Description: Binary data