segfault building video_walkthrough/meta2.cxx with circle build 200

[bartman]

$ circle --version
circle version 1.0.0-200
  Circle public preview build 200
  Built Jul 29 2023 11:15:57 EDT
  (c) 2023 Sean Baxter
  https://www.circle-lang.org/
  Twitter: @seanbax

$ circle meta1.cxx
$ ./meta1 x
f(0.000000) = 5.000000

$ circle meta2.cxx
[1]    3921113 segmentation fault (core dumped)  circle meta2.cxx
$ sudo dmesg | tail -n2
[3907349.961969] circle[3921113]: segfault at 0 ip 00000000006e7225 sp 00007ffd237b40d0 error 4 in circle[400000+39ac000] likely on CPU 13 (core 5, socket 0)
[3907349.961982] Code: 0f 1f 44 00 00 50 8b 4e 1c f7 c1 00 00 00 20 74 7c f7 c1 00 00 00 10 75 76 8b 46 18 ba ff ff ff ff 48 39 d0 74 5e 48 8b 56 10 <48> 8b 12 48 89 c7 48 c1 e7 04 48 8b 14 3a 48 85 d2 74 47 0f b6 7a
$ lscpu | grep Model.name
Model name:                         AMD Ryzen 7 5700G with Radeon Graphics

[bartman]

back trace: bt.txt core file: core.gz