Nested unwrapping does not work with variable as part of a struct

[quaesitor-scientiam]

Describe the bug

Code: https://play.vlang.io/p/6782b64467

import os {File, open_append}

type Foo = string | int | f32 | File

struct Bar {log ?Foo}
fn Bar.init(log ?Foo) {
	mut bar := Bar{log: log}
	if bar.log != none {
		if bar.log is string {
			dump(bar.log)
			logger := open_append(bar.log) or {panic(err)}
		}
	}
}

fn main() {
	Bar.init(none)
}

Reproduction Steps

Click run on the Playground page

Expected Behavior

No build error

Current Behavior

Output:

code.v:11:4: warning: unused variable: `logger`
    9 |         if bar.log is string {
   10 |             dump(bar.log)
   11 |             logger := open_append(bar.log) or {panic(err)}
      |             ~~~~~~
   12 |         }
   13 |     }
/tmp/v_60000/../../../../../../box/code.v:10: error: field not found: _main__Foo
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 .
Exited with error status 1

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.9 3b0cfbf

Environment details (OS name and version, etc.)

|V full version      |V 0.4.9 3b0cfbf
|:-------------------|:-------------------
|OS                  |linux, Debian GNU/Linux 12 (bookworm) (VM)
|Processor           |2 cpus, 64bit, little endian, Intel(R) Xeon(R) CPU E5-2680 v4 @ 2.40GHz
|Memory              |0.95GB/2.02GB
|                    |
|V executable        |/home/admin/v/v
|V last modified time|2025-01-17 14:25:29
|                    |
|V home dir          |OK, value: /home/admin/v
|VMODULES            |OK, value: .vmodules
|VTMP                |OK, value: /tmp/v_0
|Current working dir |OK, value: /home/admin/playground
|                    |
|Git version         |git version 2.39.5
|V git status        |Error: fatal: detected dubious ownership in repository at '/home/admin/v'
To add an exception for this directory, call:

	git config --global --add safe.directory /home/admin/v
|.git/config present |true
|                    |
|cc version          |cc (Debian 12.2.0-14) 12.2.0
|gcc version         |gcc (Debian 12.2.0-14) 12.2.0
|clang version       |Debian clang version 14.0.6
|tcc version         |tcc version 0.9.28rc 2024-07-31 HEAD@1cee0908 (x86_64 Linux)
|tcc git status      |Error: fatal: detected dubious ownership in repository at '/home/admin/v/thirdparty/tcc'
To add an exception for this directory, call:

	git config --global --add safe.directory /home/admin/v/thirdparty/tcc
 Error: fatal: detected dubious ownership in repository at '/home/admin/v/thirdparty/tcc'
To add an exception for this directory, call:

	git config --global --add safe.directory /home/admin/v/thirdparty/tcc

|emcc version        |N/A
|glibc version       |ldd (Debian GLIBC 2.36-9+deb12u8) 2.36

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[huly-for-github]

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