Cgen didnt declare type

[MCausc78]

Describe the bug

<title>

Reproduction Steps

import time

pub type EventListener[T] = fn (T) !

struct Chan[T] {
	c chan T
}

struct EventWaiter[T] {
	check ?fn (T) bool
	c &Chan[T]
}

pub struct EventController[T] {
mut:
	id int
	wait_fors map[int]EventWaiter[T]
	listeners map[int]EventListener[T]
}

fn (mut ec EventController[T]) generate_id() int {
	return ec.id++
}

@[params]
pub struct EmitOptions {
pub:
	error_handler ?fn (int, IError)
}

pub fn (mut ec EventController[T]) emit(e T, options EmitOptions) {
}

@[params]
pub struct EventWaitParams[T] {
pub:
	check ?fn (T) bool
	timeout ?time.Duration
}

pub fn (mut ec EventController[T]) wait[T](params EventWaitParams[T]) ?T {
	return none
}

pub fn (mut ec EventController[T]) override[T](listener EventListener[T]) EventController[T] {
	return ec
}

pub fn (mut ec EventController[T]) listen[T](listener EventListener[T]) EventController[T] {
	return ec
}

fn main() {
	ec := EventController[int]{}
}

Expected Behavior

Successful compile

Current Behavior

PS D:\Games\Proekti\V\interactions> v -cg run repro.v
repro.v:54:2: warning: unused variable: `ec`
   52 |
   53 | fn main() {
   54 |     ec := EventController[int]{}
      |     ~~
   55 | }
C:/Users/mclr/AppData/Local/Temp/v_0/repro.17533198570123215954.tmp.c:540: warning: WINVER redefined
C:/Users/mclr/AppData/Local/Temp/v_0/repro.17533198570123215954.tmp.c:942: warning: InterlockedIncrement64 redefined
In file included from C:/Users/mclr/AppData/Local/Temp/v_0/repro.17533198570123215954.tmp.c:1199:
d:/games/proekti/v/v/thirdparty/tcc/include/winapi/synchapi.h:13: warning: CreateEvent redefined
In file included from C:/Users/mclr/AppData/Local/Temp/v_0/repro.17533198570123215954.tmp.c:1199:
d:/games/proekti/v/v/thirdparty/tcc/include/winapi/synchapi.h:117: warning: OpenEvent redefined
In file included from C:/Users/mclr/AppData/Local/Temp/v_0/repro.17533198570123215954.tmp.c:1199:
d:/games/proekti/v/v/thirdparty/tcc/include/winapi/synchapi.h:167: warning: CreateMutex redefined
C:/Users/mclr/AppData/Local/Temp/v_0/repro.17533198570123215954.tmp.c:3051: error: invalid type
builder error:
==================
C error. This should never happen.

This is a compiler bug, please report it using `v bug file.v`.

https://github.com/vlang/v/issues/new/choose

You can also use #help on Discord: https://discord.gg/vlang

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.3 08189d6

Environment details (OS name and version, etc.)

V full version: V 0.4.3 140c838.08189d6
OS: windows, Microsoft Windows 11 Pro v22000 64-bit
Processor: 12 cpus, 64bit, little endian, 

getwd: D:\Games\Proekti\V\interactions
vexe: D:\Games\Proekti\V\v\v.exe
vexe mtime: 2023-12-09 09:55:27

vroot: OK, value: D:\Games\Proekti\V\v
VMODULES: OK, value: C:\Users\mclr\.vmodules
VTMP: OK, value: C:\Users\mclr\AppData\Local\Temp\v_0

Git version: git version 2.37.0.windows.1
Git vroot status: weekly.2023.48-76-g08189d64
.git/config present: true

CC version:
thirdparty/tcc status: thirdparty-windows-amd64 e90c2620

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