GNU bug report logs - #32748
26.1; EDEBUG eval error

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Live System User <nyc4bos <at> aol.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.1; EDEBUG eval error
Date: Sun, 16 Sep 2018 23:51:31 -0400

[Message part 1 (text/plain, inline)]

Hi,

        While using/learning edebug, I ran into the following
        error when eval'ing:

[edebug-error.txt (text/plain, attachment)]

[Message part 3 (text/plain, inline)]

        Eval'ing the same way in Emacs 25.2 yielded the expected:

predicate’s value is shown below.

Documentation:
Not documented as a variable.

Value: (lambda nil
  (and
   (stringp parse-time-elt)
   (=
    (length parse-time-elt)
    8)
   (=
    (aref parse-time-elt 2)
    58)
   (=
    (aref parse-time-elt 5)
    58)))


    Thannks.
    


In GNU Emacs 26.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.20.10)
 of 2018-08-31 built on localhost.localdomain
Windowing system distributor 'Fedora Project', version 11.0.11803000
Recent messages:
Accepting certificate for news.gmane.org:nntp this session only
auth-source-search: found 1 backends matching (:max 1 :host ("news.gmane.org" "news") :port ("119" "nntp" "nntp" "563" "nntps" "snews"))
Making completion list...

Configured using:
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Message #8 received at 32748 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Live System User <nyc4bos <at> aol.com>
Cc: 32748 <at> debbugs.gnu.org
Subject: Re: bug#32748: 26.1; EDEBUG eval error
Date: Mon, 17 Sep 2018 08:18:21 -0400

Live System User <nyc4bos <at> aol.com> writes:

>         While using/learning edebug, I ran into the following
>         error when eval'ing:

If you eval `predicate' just after the expression for its value (where I
put the first "!" in the code below), it hasn't been bound yet, so you
get this error.  It should work fine it you're inside the let though
(e.g., at the second "!").  It should also work in subsequent `let*'
(though not `let') bindings, but in this case, there is no such stop
point.

    (defun parse-time-string (string)
      [...]
              (let* ((rule (pop rules))
                     (slots (pop rule))
                     (predicate (pop rule)!)
                     (parse-time-val))
                !(when (and (not (nth (car slots) time)) ;not already set
                  [...]

Message #11 received at 32748 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Live System User <nyc4bos <at> aol.com>
Cc: 32748 <at> debbugs.gnu.org
Subject: Re: bug#32748: 26.1; EDEBUG eval error
Date: Wed, 03 Oct 2018 21:15:00 -0400

tags 32748 notabug
close 32748
quit

Live System User <nyc4bos <at> aol.com> writes:

>         Eval'ing the same way in Emacs 25.2 yielded the expected:
>
> predicate’s value is shown below.
>
> Documentation:
> Not documented as a variable.
>
> Value: (lambda nil
[...]

Your error backtrace suggests you used edebug-eval, but this output
suggests you used describe-variable.  The latter will not work in
emacs-26 because parse-time.el switched to lexical-binding, so that
predicate's symbol-value is no longer affected.

As mentioned in my other message, edebug-eval from within the let BODY
should work regardless, and I don't think there is a bug here, so I'm
closing this report.

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