shared int in a struct can't has a default value

[kbkpbot]

Describe the bug

try to assign a default value to a shared int field in a struct, will cause runtime error.

Reproduction Steps

s.v

module main

struct Foo {
mut:
        a shared int = 200
}

fn main() {
        mut x := Foo{}
        dump(x)
}

v run s.v

Expected Behavior

output x.a == 200

Current Behavior

$ v run s.v
/tmp/v_1000/s.01KCKPNE88WDSFWRV83PRMRQ0Q.tmp.c:2891: at indent_main__Foo_str: RUNTIME ERROR: invalid memory access
/tmp/v_1000/s.01KCKPNE88WDSFWRV83PRMRQ0Q.tmp.c:2884: by main__Foo_str
/tmp/v_1000/s.01KCKPNE88WDSFWRV83PRMRQ0Q.tmp.c:2911: by _v_dump_expr_main__Foo
/tmp/v_1000/s.01KCKPNE88WDSFWRV83PRMRQ0Q.tmp.c:8874: by main__main
/tmp/v_1000/s.01KCKPNE88WDSFWRV83PRMRQ0Q.tmp.c:8964: by main

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.12 967a4a2.c445b0c

Environment details (OS name and version, etc.)

V full version	V 0.4.12 967a4a2.c445b0c
OS	linux, Ubuntu 24.04.3 LTS
Processor	8 cpus, 64bit, little endian, Intel(R) Core(TM) i7-9700 CPU @ 3.00GHz
Memory	9.89GB/15.51GB
V executable	/media/HD/github/kbkpbot/v/v
V last modified time	2025-12-16 13:40:51
V home dir	OK, value: /media/HD/github/kbkpbot/v
VMODULES	OK, value: /home/mars/.vmodules
VTMP	OK, value: /tmp/v_1000
Current working dir	OK, value: /home/mars/v/bug/autostr
Git version	git version 2.43.0
V git status	weekly.2025.46-216-g1356b642
.git/config present	true
cc version	cc (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0
gcc version	gcc (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0
clang version	Ubuntu clang version 18.1.3 (1ubuntu1)
tcc version	tcc version 0.9.28rc 2025-02-13 HEAD@f8bd136d (x86_64 Linux)
tcc git status	thirdparty-linux-amd64 696c1d84
emcc version	N/A
glibc version	ldd (Ubuntu GLIBC 2.39-0ubuntu8.6) 2.39

Note

You can use the 👍 reaction to increase the issue's priority for developers.

Please note that only the 👍 reaction to the issue itself counts as a vote.
Other reactions and those to comments will not be taken into account.