C error from optional anonymous functions and if str_var == 'some_string' comparison

[islonely]

Describe the bug

Bug is generated when setting an option field that is an anonymous function. The error only appears when using the if statement below. Doing println(value == 'unlimited') works.

Reproduction Steps

// CycleMenuItem is a menu item that can be cycled through by pressing a button.
//
pub struct CycleMenuItem {
mut:
	label  string
	values []string
	on     CycleMenuItemEvents
}

// CycleMenuItemEvents is a set of events that can be invoked by a
// `CycleMenuItem`.
[params]
pub struct CycleMenuItemEvents {
__global:
	click ?fn (string)
	cycle ?fn (string)
}

// CycleMenuItem.new creates a new `CycleMenuItem` with the given label, values,
// and function to invoke when the item is selected.
[inline]
pub fn CycleMenuItem.new(label string, values []string, events CycleMenuItemEvents) CycleMenuItem {
	return CycleMenuItem{
		label: label
		values: values
		on: events
	}
}

fn main() {
	_ := CycleMenuItem.new('FPS', ['30', '60', '90', '120', '144', '165', 'unlimited'],
		click: fn (value string) {
			if value == 'unlimited' {
			}
		}
	)
}

Expected Behavior

Expected code to compile with no output.

Current Behavior

C:/Users/imado/AppData/Local/Temp/v_0/test.4352526411636125798.tmp.c:500: warning: WINVER redefined
C:/Users/imado/AppData/Local/Temp/v_0/test.4352526411636125798.tmp.c:6816: warning: implicit declaration of function 'tcc_backtrace'
C:/Users/imado/AppData/Local/Temp/v_0/test.4352526411636125798.tmp.c:12588: error: cannot convert 'typedef struct _option_anon_fn_string' to 'int'
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 68cbf27.24278d8

Environment details (OS name and version, etc.)

V full version: V 0.4.1 68cbf27.24278d8
OS: windows, Microsoft Windows 11 Pro v22621 64-bit
Processor: 16 cpus, 64bit, little endian, 

getwd: C:\frostbyte
vexe: C:\Users\imado\v\v.exe
vexe mtime: 2023-09-29 19:06:29

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.2023.39-20-g24278d82 (1 commit(s) behind V master)
.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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[JalonSolov]

Latest V gives a different error:

/tmp/v_1000/bug.9210805605769130305.tmp.c:12475: error: 'anon_fn_' undeclared