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Possible bug in the debugger

From: Panagiotis Koutsourakis
Subject: Possible bug in the debugger
Date: Mon, 26 Oct 2009 11:28:34 +0100

Hello all,

I recently started using the 1.9 line of development of guile and I
think I found a bug in the debugger. I am not sure if this or
bug-guile is the correct list to report this, but I guess that since
the 1.9 line is still in alpha it fits better here.

In one sentence, when I use "info frame" in the debugger I get an
Internal debugger error.

The bug exists in the most recent commit I compiled from the git
sources: b1f6293e98768f1efedde848520812fc97dea294

The machine I am testing has GNU/Linux installed, specifically Ubuntu.

uname -a gives me:
Linux megababasse 2.6.27-14-generic #1 SMP Fri Jul 24 23:49:25 UTC
2009 x86_64 GNU/Linux

The source compiles without problems and passes all tests.

To reproduce do the following:

(define (foo lst) (car lst))
(foo 5)
info frame

Sample output from my machine:

$ ./meta/guile

Guile Scheme interpreter 0.5 on Guile 1.9.4
Copyright (C) 2001-2008 Free Software Foundation, Inc.

Enter `,help' for help.
scheme@(guile-user)> (define (foo lst) (car lst))
scheme@(guile-user)> (foo 5)

In unknown file:
   ?: 0* [#<vm a56150> #<program ffaf00 at <unknown port>:1:0 ()>]
   1: 1* [foo {5}]

ERROR: In procedure vm-debug-engine:
ERROR: Wrong type argument in position 1 (expecting pair): 5
scheme@(guile-user)> (debug)
This is the Guile debugger -- for help, type `help'.
There are 2 frames on the stack.

Frame 1 at unknown source location
        [foo 5]
debug> info frame
Stack frame: 1 (real)
This frame is an application.
The corresponding expression is:
  Internal debugger error:
ERROR: In procedure unmemoize-expr:
ERROR: Wrong type argument in position 1 (expecting memoized code): (9
#f 0 . 18)

If you need any more information I would be happy to provide it.

Best regards,
Panagiotis Koutsourakis

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