C builderr with option as struct field.

[islonely]

Describe the bug

When setting a struct field to an option with a default value a C error occurs.

Reproduction Steps

type SomeType = SomeStruct | string

struct SomeStruct {}

struct AnotherStruct {
	field ?SomeType = 'default_string'
}

fn main() {
	println(AnotherStruct{})
}

Expected Behavior

Expected code to compile and print this:

AnotherStruct{
    field: Option('default_string')
}

Current Behavior

C:/Users/imado/AppData/Local/Temp/v_0/test.2663439158810552116.tmp.c:507: warning: WINVER redefined
C:/Users/imado/AppData/Local/Temp/v_0/test.2663439158810552116.tmp.c:6907: warning: implicit declaration of function 'tcc_backtrace'
C:/Users/imado/AppData/Local/Temp/v_0/test.2663439158810552116.tmp.c:12679: error: cannot convert 'struct string' to 'unsigned char'
builder error: 
==================
C error. This should never happen.

Possible Solution

No response

Additional Information/Context

No response

V version

V full version: V 0.4.1 68cbf27.3fab321

Environment details (OS name and version, etc.)

V full version: V 0.4.1 68cbf27.3fab321
OS: windows, Microsoft Windows 11 Pro v22621 64-bit
Processor: 16 cpus, 64bit, little endian, 

getwd: C:\Users\imado\Documents\cyberian_tiger
vexe: C:\Users\imado\v\v.exe
vexe mtime: 2023-09-23 02:25:12

vroot: OK, value: C:\Users\imado\v
VMODULES: OK, value: C:\Users\imado\.vmodules
VTMP: OK, value: C:\Users\imado\AppData\Local\Temp\v_0

Git version: git version 2.33.1.windows.1
Git vroot status: weekly.2023.38-24-g3fab3213
.git/config present: true

CC version: Error: 'cc' is not recognized as an internal or external command,
operable program or batch file.

thirdparty/tcc status: thirdparty-windows-amd64 e90c2620

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