C compilation error when accessing an element in a multi-dimensional array of optionals

[jfcode4]

V version: V 0.4.9 eecaa64, press to see full `v doctor` output

V full version	V 0.4.9 eecaa64
OS	linux, Linux version 6.12.11-200.fc41.x86_64 (mockbuild@8c05b49e2e66460390f7ce4d04d4f464) (gcc (GCC) 14.2.1 20250110 (Red Hat 14.2.1-7), GNU ld version 2.43.1-5.fc41) #1 SMP PREEMPT_DYNAMIC Fri Jan 24 04:59:58 UTC 2025
Processor	12 cpus, 64bit, little endian, AMD Ryzen 5 1600X Six-Core Processor
Memory	1.83GB/7.67GB
V executable	/home/jacob/.local/v/v
V last modified time	2025-02-05 08:29:54
V home dir	OK, value: /home/jacob/.local/v
VMODULES	OK, value: /home/jacob/.vmodules
VTMP	OK, value: /tmp/v_1000
Current working dir	OK, value: /home/jacob/code/v/chess
Git version	git version 2.48.1
V git status	Error: fatal: not a git repository (or any parent up to mount point /)
Stopping at filesystem boundary (GIT_DISCOVERY_ACROSS_FILESYSTEM not set).
.git/config present	false
cc version	cc (GCC) 14.2.1 20250110 (Red Hat 14.2.1-7)
gcc version	gcc (GCC) 14.2.1 20250110 (Red Hat 14.2.1-7)
clang version	clang version 19.1.7 (Fedora 19.1.7-1.fc41)
tcc version	tcc version 0.9.28rc 2024-07-31 HEAD@1cee0908 (x86_64 Linux)
tcc git status	N/A
emcc version	N/A
glibc version	ldd (GNU libc) 2.40

What did you do?
v bug.v

struct Test{
	board   [8][8]?Piece
}
struct Piece{
	white   bool
}
fn main() {
	t := Test{}
	println(t.board[1][2]) // error happens here
}

What did you see?

================== C compilation error (from tcc): ==============
cc: /tmp/v_1000/bug.01JKZECDNZ1V3W4D7F3XZ7HFNX.tmp.c:1050: error: ';' expected (got "Array_fixed_Array_fixed__option_main__Piece_8_8")
=================================================================
(You can pass `-cg`, or `-show-c-output` as well, to print all the C error messages).
builder error: 
==================
C error found. It should never happen, when compiling pure V code.
This is a V compiler bug, please report it using `v bug file.v`,
or goto https://github.com/vlang/v/issues/new/choose .
You can also use #help on Discord: https://discord.gg/vlang .

What did you expect to see?

no C compilation error

It looks like accessing an element in a multi-dimensional array of optionals causes this error. The error doesn't happen on 1-dimensional arrays or even multi-dimensional slices.

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