[ clisp-Bugs-3598754 ] sort + union destroys underlying union members

Bugs item #3598754, was opened at 2012-12-28 07:17
Message generated for change (Tracker Item Submitted) made by wplapper-2
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Category: None
Group: lisp error
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: winfriedp (wplapper-2)
Assigned to: Nobody/Anonymous (nobody)
Summary: sort + union destroys underlying union members

Initial Comment:
sorting a union destroys the underlying elements. I am using 'union' and not 'nunion'.

(defconstant *NEIGHBOURS2*  (map 'simple-vector #'(lambda(cell)
  (multiple-value-bind (r c b) (lin2rcbmvb cell)
    (sort (copy-seq
    (remove cell (union (union (svref *UNIT-LIST-VL2* r)
                               (svref *UNIT-LIST-VL2* c))
                        (svref *UNIT-LIST-VL2* b))))
    #'<))) *CELLS*))
Without forcing an additional coy via copy-seq, some of *UNIT-LIST-VL2* gets modified.

Base info: Kubuntu 12.10, uname -a: Linux kunbuntu-x64 3.5.0-21-generic #32-Ubuntu SMP Tue Dec 11 18:51:59 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

clisp --version
GNU CLISP 2.49 (2010-07-07) (built on allspice.buildd [127.0.1.1])
Software: GNU C 4.6.2 
gcc -falign-functions=4 -W -Wswitch -Wcomment -Wpointer-arith -Wimplicit -Wreturn-type -Wmissing-declarations -Wno-sign-compare -Wno-format-nonliteral -O -falign-functions=4 -DENABLE_UNICODE -DDYNAMIC_FFI -DDYNAMIC_MODULES -I. -Wl,-Bsymbolic-functions -Wl,-z,relro  -lreadline -lncurses -ldl /usr/lib/libavcall.so /usr/lib/libcallback.so  -L/usr/lib -lsigsegv libgnu_cl.a 
SAFETY=0 TYPECODES WIDE_HARD GENERATIONAL_GC SPVW_BLOCKS SPVW_MIXED TRIVIALMAP_MEMORY
libsigsegv 2.9
libreadline 5.2
libffcall 1.11
Features: 
(READLINE REGEXP SYSCALLS I18N LOOP COMPILER CLOS MOP CLISP ANSI-CL COMMON-LISP LISP=CL INTERPRETER SOCKETS GENERIC-STREAMS LOGICAL-PATHNAMES SCREEN FFI GETTEXT UNICODE
 BASE-CHAR=CHARACTER WORD-SIZE=64 PC386 UNIX)
C Modules: (clisp i18n syscalls regexp readline)
Installation directory: /usr/lib/clisp-2.49/
User language: ENGLISH
Machine: X86_64 (X86_64) kunbuntu-x64 [127.0.1.1]

I am building the structures *UNIT-LIST-VLx* and *NEIGHBOURSx* twice, in order to show the desctructive behaviour of sort.
SBCL and CCL do the right thing for me.

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