Running method with concurrency gives c error: pointer expected

[daansystems]

V version: V 0.4.9 3c88926, press to see full `v doctor` output

V full version	V 0.4.9 5c65e58.3c88926
OS	windows, Microsoft Windows 11 Pro 26100 64-bit
Processor	24 cpus, 64bit, little endian, AMD Ryzen 9 3900X 12-Core Processor
Memory	16.1GB/31.9GB
V executable	C:\v\v.exe
V last modified time	2025-02-23 15:50:09
V home dir	OK, value: C:\v
VMODULES	OK, value: C:\Users\info.vmodules
VTMP	OK, value: C:\Users\info\AppData\Local\Temp\v_0
Current working dir	OK, value: D:\vbug2
Git version	git version 2.42.0.windows.2
V git status	weekly.2025.08-30-g3c88926f-dirty
.git/config present	true
cc version	N/A
gcc version	N/A
clang version	clang version 17.0.1
msvc version	N/A
tcc version	tcc version 0.9.27 (x86_64 Windows)
tcc git status	thirdparty-windows-amd64 b425ac82
emcc version	N/A
glibc version	ldd (cygwin) 3.4.7

What did you do?
./v -g -o vdbg cmd/v && ./vdbg main.v && D:\vbug2\main.exe

module main



@[heap]
interface IGameObject {
mut:
	name     string
	parent   ?&IGameObject
	children []&IGameObject
	advance()
}

@[heap]
struct GameObject implements IGameObject {
mut:
	name     string
	parent   ?&IGameObject
	children []&IGameObject
}

struct Ship implements IGameObject {
	GameObject
	speed f32
}

fn (mut gameobject GameObject) advance() {
	for mut child in gameobject.children {
		go child.advance()
	}
}

fn main() {
	mut ship := &Ship{
		name: 'ship'
	}
	ship.advance()
}

What did you see?

================== C compilation error (from tcc): ==============
cc: C:/Users/info/AppData/Local/Temp/v_0/main.01JMSVTNC5B0THKVJY24F34MMC.tmp.c:532: warning: WINVER redefined
cc: C:/Users/info/AppData/Local/Temp/v_0/main.01JMSVTNC5B0THKVJY24F34MMC.tmp.c:2054: error: pointer expected
=================================================================
(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 error

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.

[huly-for-github]

Connected to Huly®: V_0.6-22208

[JalonSolov]

Fails the same for me on Linux (except I don't see the line about WINVER), same version of V. Adding -g doesn't help.