[Maxima-bugs] [maxima:bugs] #4647 Maxima error in --preload file causes Lisp error

[Robert D. <rob...@us...>]

---

**[bugs:#4647] Maxima error in --preload file causes Lisp error**

**Status:** open
**Group:** None
**Labels:** command line batch error handling 
**Created:** Wed Dec 10, 2025 05:48 PM UTC by Robert Dodier
**Last Updated:** Wed Dec 10, 2025 05:48 PM UTC
**Owner:** nobody


Working with a recent build (1c6a095). A Maxima error in a file loaded via `--preload` causes a Lisp error, and puts the user in the Lisp debugger. 

E.g. let `foo.mac` contain just `error("Foo");`. Then:

```
sh maxima-local -l sbcl -p foo.mac
read and interpret /home/dodier/sourceforge/maxima-code/foo.mac
Foo
 -- an error. To debug this try: debugmode(true);
Maxima encountered a Lisp error:

 attempt to THROW to a tag that does not exist: MACSYMA-QUIT

Automatically continuing.
To enable the Lisp debugger set *debugger-hook* to nil.

debugger invoked on a SB-INT:SIMPLE-CONTROL-ERROR @52A00940 in thread
#<THREAD "main thread" RUNNING {10028F4103}>:
  attempt to THROW to a tag that does not exist: RETURN-FROM-DEBUGGER

Type HELP for debugger help, or (SB-EXT:EXIT) to exit from SBCL.

restarts (invokable by number or by possibly-abbreviated name):
  0: [CONTINUE] Ignore runtime option --eval "(cl-user::run)".
  1: [ABORT   ] Skip rest of --eval and --load options.
  2:            Skip to toplevel READ/EVAL/PRINT loop.
  3: [EXIT    ] Exit SBCL (calling #'EXIT, killing the process).

(THROW)
0]
```
I think whatever mechanism is loading `--preload` files needs to catch MACSYMA-QUIT and just go on to the next command line argument.


---

Sent from sourceforge.net because max...@li... is subscribed to https://sourceforge.net/p/maxima/bugs/

To unsubscribe from further messages, a project admin can change settings at https://sourceforge.net/p/maxima/admin/bugs/options.  Or, if this is a mailing list, you can unsubscribe from the mailing list.