dump of a fixed array of option strings fails to compile

[spytheman]

V doctor:

V full version: V 0.4.1 8f69bd1.b5f71df
OS: linux, Ubuntu 20.04.6 LTS
Processor: 4 cpus, 64bit, little endian, Intel(R) Core(TM) i3-3225 CPU @ 3.30GHz

getwd: /space/v/vnew
vexe: /space/v/vnew/v
vexe mtime: 2023-09-29 02:48:24

vroot: OK, value: /space/v/vnew
VMODULES: OK, value: /home/delian/.vmodules
VTMP: OK, value: /tmp/v_1000

Git version: git version 2.42.0
Git vroot status: weekly.2023.39-19-g1476daf8
.git/config present: true

CC version: cc (Ubuntu 10.5.0-1ubuntu1~20.04) 10.5.0
thirdparty/tcc status: thirdparty-linux-amd64 12f392c3

What did you do?
v -g -o vdbg cmd/v && vdbg a.v

a := [?string('foo'), ?string(none)]!
dump(a)

What did you expect to see?

compiled program that runs

What did you see instead?

==================
/tmp/v_1000/a.946870798248241139.tmp.c:2074: error: cannot convert 'struct _option_string' to 'unsigned char *'
...
==================
(Use `v -cg` to print the entire error message)

builder error: 
==================
C error. This should never happen.

This is a compiler bug, please report it using `v bug file.v`.

https://github.com/vlang/v/issues/new/choose

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[spytheman]

println(a) also does not work.

println( a[0]! ) works.