parser error: unexpected token ?, expecting name

[enghitalo]

Describe the bug

wrong checking for option type

Reproduction Steps

module main

import json

fn func(arg ?string, val &int) ?int {
	println('hello from func')
	unsafe { *val = 2 }
	return 2
}

fn main() {

	mapa := {"json": func}
	dump(mapa)
	dump(typeof(mapa['json']).name)

	mapa2 := map[string]fn(?string, &int) ?int{}
	mapa2["json"] = func

	number := 0

	mapa["json"]('hola', &number)

	dump(number)
}

Expected Behavior

not error

Current Behavior

a.v:18:25: error: unexpected token `?`, expecting name
   16 |     dump(typeof(mapa['json']).name)
   17 | 
   18 |     mapa2 := map[string]fn(?string, &int) ?int{}
      |                            ^
   19 |     mapa2["json"] = func
   20 |

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.8 fc6e481

Environment details (OS name and version, etc.)

Linux

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_{Huly®: V_0.6-21183}