[Maxima-bugs] [ maxima-Bugs-3098375 ] general-display-prefix missing in some circumstances

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Bugs item #3098375, was opened at 2010-10-29 13:56
Message generated for change (Tracker Item Submitted) made by vfbraun
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Category: Lisp Core
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Volker (vfbraun)
Assigned to: Nobody/Anonymous (nobody)
Summary: general-display-prefix missing in some circumstances

Initial Comment:
The general-display-prefix is not printed in front of "incorrect syntax:" errors with maxima 5.22.1:

Maxima 5.22.1 http://maxima.sourceforge.net
using Lisp ECL 10.4.1
Distributed under the GNU Public License. See the file COPYING.
Dedicated to the memory of William Schelter.
The function bug_report() provides bug reporting information.
(%i1) 1+1;
<general-display-prefix>(%o1)                                  2
(%i2) 1==1;
incorrect syntax: = is not a prefix operator
1==
 ^
(%i2) 1=1;
<general-display-prefix>(%o2)                                1 = 1

Maxima 5.20.1 behaved differently:

Maxima 5.20.1 http://maxima.sourceforge.net
using Lisp ECL 10.2.1
Distributed under the GNU Public License. See the file COPYING.
Dedicated to the memory of William Schelter.
The function bug_report() provides bug reporting information.
(%i1) 1+1;
<general-display-prefix>(%o1)                                  2
(%i2) 1==1;
Incorrect syntax: = is not a prefix operator
(%i2) <general-display-prefix>(%o2)                                  1
(%i3) 1=1;
<general-display-prefix>(%o3)                                1 = 1

This breaks programs that parse the maxima command line interaction, for example, Sage.


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