C error when returning Error{} as int

[gechandesu]

V doctor:

V full version: V 0.4.8 5ec9bb5.419645a
OS: linux, Linux version 6.6.8-arch1-1 (linux@archlinux) (gcc (GCC) 13.2.1 20230801, GNU ld (GNU Binutils) 2.41.0) #1 SMP PREEMPT_DYNAMIC Thu, 21 Dec 2023 19:01:01 +0000
Processor: 16 cpus, 64bit, little endian, 12th Gen Intel(R) Core(TM) i5-1240P

getwd: /home/ge
vexe: /home/ge/.vlang/v
vexe mtime: 2024-10-26 09:36:27

vroot: OK, value: /home/ge/.vlang
VMODULES: OK, value: /home/ge/.vmodules
VTMP: OK, value: /tmp/v_1000

Git version: git version 2.46.1
Git vroot status: weekly.2024.43-35-g419645a0
.git/config present: true

CC version: cc (GCC) 14.2.1 20240910
thirdparty/tcc status: thirdparty-linux-amd64 0134e9b9

What did you do?
./v -g -o vdbg cmd/v && ./vdbg x2.v

module main

fn double_positive(num int) int {
	if num <= 0 {
		return Error{}
	}
	return num * 2
}

fn main() {
	println(double_positive(2))
}

What did you expect to see?

V error about wrong function return type. May be related to #22658

What did you see instead?

================== C compilation error (from tcc): ==============
cc: /tmp/v_1000/x2.01JB44ND9EMBWAWR48D85A9BFN.tmp.c:13469: error: cannot convert 'struct IError' to 'int'
=================================================================
(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 .

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_{Huly®: V_0.6-21108}