[PD] making a list of pointers: "consistency check failed.."

[Rich E]

So I'm trying to make a list of pointers that point to array members within
a specified region of the canvas.  This way, I can use the list to
manipulate a specified region without altering the rest.  The attached patch
shows how I attempt to do it using a list append looped to a list (which
then sends the appended list back to the cold inlet of the list append).
This does create the list I want, but I get the message "consistency check
failed: gpointer copy" (sometimes gstub_dis).  My question is, what does
this mean?  Is there a better way to store a succession of pointers for
later use?

Regards,
Rich
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#N struct blarg float x float y float z float q array bazoo blarg-element
;
#N struct blarg-element float y;
#N canvas 0 22 466 429 10;
#X obj 74 85 pointer;
#X obj 140 294 list;
#X obj 99 314 list append;
#N canvas 547 22 474 324 blargplot 0;
#X scalar blarg 50 150 30 9 \; 0 \; 2 \; 1 \; 0 \; 0 \; 3 \; 0 \; 0
\; 0 \; 7 \; \;;
#X restore 279 211 pd blargplot;
#N canvas 293 363 658 272 blarg-template 0;
#X obj 8 91 filledpolygon 244 q 3 0 0 20 z 40 0;
#X text 6 44 this declares an array named "bazoo" whose elements are
described by "template5-element." Array declarations take three arguments
while "float" declarations take only two.;
#X text 6 136 Here we ask to plot the array \, color 700 \, line width
3 \, starting location (30 \, 10) relative to the scalar \, points
spaced 4 apart.;
#X text 7 186 You can also do (x \, y) plots and/or make the line thickness
variable---see the help window for "plot".;
#X obj 8 113 plot bazoo 700 3 30 40 4;
#X obj 6 8 struct blarg float x float y float z float q array bazoo
blarg-element;
#X restore 278 233 pd blarg-template;
#N canvas 65 248 576 136 bazoo-element 0;
#X text 12 36 This says that array elements will have a single floating-point
number named "y". The variable name "y" is automatically assumed to
control screen height \; if you don't have at least that variable you
can't plot the array..;
#X obj 35 11 struct blarg-element float y;
#X restore 278 256 pd bazoo-element;
#N canvas 386 232 605 445 stuff 0;
#X obj 351 170 pointer;
#X obj 136 102 t b b b;
#X msg 136 61 bang;
#X text 170 61 click here to re-initialize;
#X obj 137 23 loadbang;
#X msg 136 134 50 150 30 9;
#X obj 134 191 t b b p;
#X floatatom 68 327 0 0 0 0 - - -;
#X floatatom 14 332 0 0 0 0 - - -;
#X obj 20 303 unpack;
#X msg 354 139 traverse pd-blargplot \, bang;
#X obj 68 350 element blarg bazoo;
#X obj 14 376 set blarg-element y;
#X obj 284 307 setsize blarg bazoo;
#X msg 12 258 3 5 \, 7 9 \, 1 2 \, 2 1;
#X msg 283 280 10;
#X msg 354 100 \; pd-blargplot clear;
#X obj 134 163 append blarg x y z q;
#X connect 0 0 17 4;
#X connect 1 0 5 0;
#X connect 1 1 10 0;
#X connect 1 2 16 0;
#X connect 2 0 1 0;
#X connect 4 0 2 0;
#X connect 5 0 17 0;
#X connect 6 0 14 0;
#X connect 6 1 15 0;
#X connect 6 2 11 1;
#X connect 6 2 13 1;
#X connect 7 0 11 0;
#X connect 8 0 12 0;
#X connect 9 0 8 0;
#X connect 9 1 7 0;
#X connect 10 0 0 0;
#X connect 11 0 12 1;
#X connect 14 0 9 0;
#X connect 15 0 13 0;
#X connect 17 0 6 0;
#X restore 281 190 pd stuff;
#X floatatom 150 150 5 0 0 0 - - -;
#X obj 74 130 getsize blarg bazoo;
#X obj 97 195 until;
#X msg 141 191 0;
#X obj 129 216 + 1;
#X obj 100 215 f;
#X obj 75 106 t p p;
#X msg 75 53 traverse pd-blargplot \, next;
#X obj 95 240 element blarg bazoo;
#X obj 74 153 t b f b;
#X msg 177 268 bang;
#X obj 94 266 t p b;
#X obj 28 367 print pointerlist;
#X obj 46 336 list;
#X connect 0 0 13 0;
#X connect 1 0 2 1;
#X connect 2 0 1 1;
#X connect 2 0 20 1;
#X connect 8 0 7 0;
#X connect 8 0 16 0;
#X connect 9 0 12 0;
#X connect 10 0 12 1;
#X connect 11 0 12 1;
#X connect 12 0 11 0;
#X connect 12 0 15 0;
#X connect 13 0 8 0;
#X connect 13 1 15 1;
#X connect 14 0 0 0;
#X connect 15 0 18 0;
#X connect 16 0 20 0;
#X connect 16 1 9 0;
#X connect 16 2 10 0;
#X connect 16 2 17 0;
#X connect 17 0 2 1;
#X connect 18 0 2 0;
#X connect 18 1 1 0;
#X connect 20 0 19 0;