Failed to assign an Option/none in map[string]?string

[Ddiidev]

Describe the bug

Code: https://vosca.dev/p/2e4ea06fa8

f := fn (s ?string) ?string {
	return s
}

mut data := map[string]?string{}
// ERROR!!
data = {
	'name': ?string('andre')
	'age': ?string('')
}


// ERROR!!
// data = {
// 	'name': ?string('andre')
// 	'age': ?string(none)
// }

// Apparently works with windowless TCC
// data = {
// 	'name': f('andre')
// 	'age': f(none)
// }

dump(data)

Expected Behavior

data: {
  name: Option('andre')
  age: Option('')
}

Current Behavior

Output:

code.v:1:1: warning: unused variable: `f`
    1 | f := fn (s ?string) ?string {
      | ^
    2 |     return s
    3 | }
/tmp/v_60000/code.2308165315178286467.tmp.c:2137: error: cannot convert 'struct _option_string' to 'unsigned char *'
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

Exited with error status 1

Reproduction Steps

https://vosca.dev/p/2e4ea06fa8

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.3.4 fc4c431.45f16a2

Environment details (OS name and version, etc.)

V full version: V 0.4.0 fc4c431.ded6c38
OS: linux, Ubuntu 22.04.2 LTS
Processor: 2 cpus, 64bit, little endian, Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz

getwd: /home/pmakhnev/playground
vexe: /home/pmakhnev/v/v
vexe mtime: 2023-07-07 00:00:17

vroot: OK, value: /home/pmakhnev/v
VMODULES: OK, value: /root/.vmodules
VTMP: OK, value: /tmp/v_0

Git version: git version 2.34.1
Git vroot status: weekly.2023.27-29-gded6c380
.git/config present: true

CC version: cc (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0
thirdparty/tcc status: thirdparty-linux-amd64 12f392c3