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Re: does VFX have the same bug as Gforth?

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From Bernd Paysan <bernd.paysan@gmx.de>
Newsgroups comp.lang.forth
Subject Re: does VFX have the same bug as Gforth?
Date Tue, 19 Aug 2014 16:09:23 +0200
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Alex McDonald wrote:
> I would like to see that explained, since setting a single behaviour for
> IMMEDIATE words in my Forth has not caused any problems for me; and I
> struggle to see what code this might break. Can you give a concrete
> example?

Ok, simple example:

: cond, ( xt -- )  >r postpone IF r> compile, postpone THEN ;
: ?exit ( -- ) ['] exit cond, ; immediate

Works fine when EXIT is not immediate - that's my assumption for now that 
EXIT is non-immediate.  But unfortunately, you loaded the locals extensions 
before, and there, EXIT has been defined as (cut&paste these lines into your 
Forth first):

: adjust-localstack ( -- ) ." Adjust local stack" ;
: exit ( -- )  adjust-localstack postpone exit ; immediate

And now, after defining cond, and ?exit as above, we enter:

: zero? ?exit ." zero" ;

Let's test it:

0 zero? zero ok
1 zero? Adjust local stackzero ok

Oops.  That's not exactly what we wanted.

-- 
Bernd Paysan
"If you want it done right, you have to do it yourself"
http://bernd-paysan.de/

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does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-17 21:09 -0700
  Re: does VFX have the same bug as Gforth? Bee <forth@calcentral.com> - 2014-08-17 23:06 -0700
    Re: does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-18 17:03 -0700
      Re: does VFX have the same bug as Gforth? "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-08-18 22:19 -0400
      Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-19 09:14 +0000
        Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-08-19 15:23 +0200
          Re: does VFX have the same bug as Gforth? "Alex McDonald" <blog@rivadpm.com> - 2014-08-19 14:54 +0100
            Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-08-19 16:09 +0200
              Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-19 15:39 +0000
                Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-08-19 22:34 +0200
                Re: does VFX have the same bug as Gforth? "Alex McDonald" <blog@rivadpm.com> - 2014-08-19 23:29 +0100
                Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-08-20 23:06 +0200
                Re: does VFX have the same bug as Gforth? "Alex McDonald" <blog@rivadpm.com> - 2014-08-20 22:21 +0100
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-20 07:46 +0000
                Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-08-21 00:26 +0200
                Re: does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-20 22:42 -0700
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-21 10:23 +0000
                Re: does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-21 23:29 -0700
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-22 12:54 +0000
                Re: does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-22 17:54 -0700
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-23 10:46 +0000
                Re: does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-23 11:15 -0700
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-24 13:32 +0000
                Re: does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-24 10:40 -0700
                Re: does VFX have the same bug as Gforth? Bee <forth@calcentral.com> - 2014-08-24 22:03 -0700
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-25 08:31 +0000
                Re: does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-25 22:55 -0700
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-21 12:45 +0000
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-22 15:13 +0000
                Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-08-22 18:47 +0200
                Re: does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-22 18:28 -0700
                Re: does VFX have the same bug as Gforth? "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-08-23 04:44 -0400
                Re: does VFX have the same bug as Gforth? Coos Haak <chforth@hccnet.nl> - 2014-08-23 16:15 +0200
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-23 11:50 -0500
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-23 07:15 +0000
                Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-08-23 22:12 +0200
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-24 03:51 -0500
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-24 13:36 +0000
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-25 04:16 -0500
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-25 09:44 +0000
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-25 11:53 -0500
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 06:34 +0000
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-26 03:55 -0500
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 12:37 +0000
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-26 08:24 -0500
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 13:55 +0000
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-26 10:42 -0500
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 16:05 +0000
                Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-09-23 17:20 +0200
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-09-23 11:29 -0500
                Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-09-23 23:01 +0200
                Re: does VFX have the same bug as Gforth? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2014-08-25 15:59 +0000
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 06:23 +0000
                Re: does VFX have the same bug as Gforth? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2014-08-26 09:15 +0000
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 13:23 +0000
                Re: does VFX have the same bug as Gforth? Mark Wills <markwills1970@gmail.com> - 2014-08-26 01:41 -0700
                Re: does VFX have the same bug as Gforth? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2014-08-26 09:32 +0000
                Re: does VFX have the same bug as Gforth? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2014-08-26 09:43 +0000
                Re: does VFX have the same bug as Gforth? Mark Wills <markwills1970@gmail.com> - 2014-08-26 02:48 -0700
                Re: does VFX have the same bug as Gforth? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2014-08-26 11:58 +0000
                Re: does VFX have the same bug as Gforth? Mark Wills <markwills1970@gmail.com> - 2014-08-26 05:20 -0700
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 12:30 +0000
                Re: does VFX have the same bug as Gforth? stephenXXX@mpeforth.com (Stephen Pelc) - 2014-08-25 14:15 +0000
                Re: does VFX have the same bug as Gforth? Mark Wills <markwills1970@gmail.com> - 2014-08-25 07:44 -0700
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-25 14:37 +0000
                Re: does VFX have the same bug as Gforth? stephenXXX@mpeforth.com (Stephen Pelc) - 2014-08-25 15:14 +0000
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-25 15:33 +0000
                Re: does VFX have the same bug as Gforth? Mark Wills <markwills1970@gmail.com> - 2014-08-26 01:56 -0700
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-26 04:16 -0500
                Re: does VFX have the same bug as Gforth? Mark Wills <markwills1970@gmail.com> - 2014-08-26 02:24 -0700
                Re: does VFX have the same bug as Gforth? albert@spenarnc.xs4all.nl (Albert van der Horst) - 2014-08-26 09:36 +0000
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 13:40 +0000
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-26 08:57 -0500
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 12:52 +0000
                Re: does VFX have the same bug as Gforth? stephenXXX@mpeforth.com (Stephen Pelc) - 2014-08-26 14:14 +0000
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 14:36 +0000
                Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-09-23 17:40 +0200
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-26 10:53 -0500
                Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-09-23 17:36 +0200
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-25 12:02 -0500
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 06:42 +0000
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-26 04:08 -0500
                Re: does VFX have the same bug as Gforth? stephenXXX@mpeforth.com (Stephen Pelc) - 2014-08-26 10:37 +0000
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-26 08:30 -0500
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-28 08:47 -0500
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-29 13:03 +0000
                Re: does VFX have the same bug as Gforth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2014-08-29 09:16 -0500
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 13:06 +0000
                Re: does VFX have the same bug as Gforth? "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-08-26 07:36 -0400
                Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-09-23 17:28 +0200
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-24 09:48 +0000
                Re: does VFX have the same bug as Gforth? "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-08-24 15:55 -0400
                Re: does VFX have the same bug as Gforth? "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-08-24 15:55 -0400
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-25 08:26 +0000
                Re: does VFX have the same bug as Gforth? "Rod Pemberton" <dont_use_email@xnothavet.cqm> - 2014-08-26 07:36 -0400
                Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-26 12:12 +0000
                Re: does VFX have the same bug as Gforth? Bernd Paysan <bernd.paysan@gmx.de> - 2014-09-23 17:45 +0200
                Re: does VFX have the same bug as Gforth? Mark Wills <markwills1970@gmail.com> - 2014-08-21 03:25 -0700
                Re: does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-21 23:14 -0700
            Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-19 14:16 +0000
  Re: does VFX have the same bug as Gforth? Bee <forth@calcentral.com> - 2014-08-17 23:16 -0700
    Re: does VFX have the same bug as Gforth? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2014-08-19 09:40 +0000
  Re: does VFX have the same bug as Gforth? Paul E Bennett <Paul_E.Bennett@topmail.co.uk> - 2014-08-18 09:16 +0100
  Re: does VFX have the same bug as Gforth? Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2014-08-18 09:32 +0100
    Re: does VFX have the same bug as Gforth? "Alex McDonald" <blog@rivadpm.com> - 2014-08-18 13:09 +0100
  Re: does VFX have the same bug as Gforth? stephenXXX@mpeforth.com (Stephen Pelc) - 2014-08-18 12:29 +0000
    Re: does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-18 17:10 -0700
      Re: does VFX have the same bug as Gforth? Bee <forth@calcentral.com> - 2014-08-18 17:48 -0700
        Re: does VFX have the same bug as Gforth? hughaguilar96@yahoo.com - 2014-08-18 18:23 -0700
      Re: does VFX have the same bug as Gforth? Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2014-08-19 13:55 +0100

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