[GC] level  1	gcs(minor)  0	gcs(major)  1
[GC] stack	0x00007fff9ffd3510	0xffffffff9ffd36b0	0x00007fffa00d3510
[GC]  from	0x00007f33e2ae5010	0x00007f33e2b1c768	0x00007f33e2b65010	0x0000000000037758
[GC]    to	0x00007f33e2b66010	0x00007f33e2b66010	0x00007f33e2be6010 
[GC] 0 locatives (from 32)
[GC] (old) fromspace: 	start=0x00007f33e2ae5010, 	limit=0x00007f33e2b65010
[GC] (old) tospace:   	start=0x00007f33e2b66010, 	limit=0x00007f33e2be6010
[GC] resized heap to 3145728 bytes
[GC] (new) fromspace: 	start=0x00007f33e19bd010, 	limit=0x00007f33e1b3d010
[GC] (new) tospace:   	start=0x00007f33e2a66010, 	limit=0x00007f33e2be6010
reclaim p[1] = 0x7f33e1a24a88, p[0] = 0x7f33e1a23d18
reclaim p[1] = 0x7f33e1a247f0, p[0] = 0x7f33e1a23e78
[GC] (old) fromspace: 	start=0x00007f33e19bd010, 	limit=0x00007f33e1b3d010
[GC] (old) tospace:   	start=0x00007f33e2a66010, 	limit=0x00007f33e2be6010
RERECLAIM p[1] = 0x7f33e2a66010, p[0] = 0x7f33e1a23d18
RERECLAIM p[1] = 0x7f33e2a66028, p[0] = 0x7f33e1a23e78
[GC] resized heap to 1572864 bytes
[GC] (new) fromspace: 	start=0x00007f33e16f9010, 	limit=0x00007f33e17b9010
[GC] (new) tospace:   	start=0x00000000025ecca0, 	limit=0x00000000026acca0
[GC] level  1	gcs(minor)  23	gcs(major)  2
[GC] stack	0x00007fff9ffd3510	0xffffffffa00d1f30	0x00007fffa00d3510
[GC]  from	0x00007f33e16f9010	0x00007f33e17432e8	0x00007f33e17b9010	0x000000000004a2d8
[GC]    to	0x00000000025ecca0	0x00000000025ecca0	0x00000000026acca0 
[GC] 0 locatives (from 32)
reclaim p[1] = 0x7fffa004c298, p[0] = 0x7f33e17278a8
[GC] level  1	gcs(minor)  1	gcs(major)  3
[GC] stack	0x00007fff9ffd3510	0xffffffffa0049c40	0x00007fffa00d3510
[GC]  from	0x00000000025ecca0	0x0000000002637cd0	0x00000000026acca0	0x000000000004b030
[GC]    to	0x00007f33e16f9010	0x00007f33e16f9010	0x00007f33e17b9010 
[GC] 0 locatives (from 32)

Error: unbound variable: foo

	Call history:

	<syntax>	  #<invalid forwarded object>
	<syntax>	  #<invalid forwarded object>
	<syntax>	  (##core#quote #<invalid forwarded object>)
	<syntax>	  #<invalid forwarded object>
	<eval>	  (mutate-procedure! #<invalid forwarded object> (lambda (#<invalid forwarded object>) (lambda #<inval......
	<syntax>	  (assert (not (eq? foo new-foo)))
	<syntax>	  (##core#let ((tmp139 (not (eq? foo new-foo)))) (##core#if (##core#check tmp139) tmp139 (##sys#error ...
	<syntax>	  (##core#begin (##core#if (##core#check tmp139) tmp139 (##sys#error "assertion failed" (##core#quote ...
	<syntax>	  (##core#if (##core#check tmp139) tmp139 (##sys#error "assertion failed" (##core#quote (not (eq? foo ......
	<syntax>	  (##core#check tmp139)
	<syntax>	  (##sys#error "assertion failed" (##core#quote (not (eq? foo new-foo))))
	<syntax>	  (##core#quote (not (eq? foo new-foo)))
	<syntax>	  (not (eq? foo new-foo))
	<syntax>	  (eq? foo new-foo)
	<eval>	  (not (eq? foo new-foo))
	<eval>	  (eq? foo new-foo)	<--