Cannot swap maps, neither with clone(), nor with move()

[mp81ss]

Describe the bug

fn main()
{
    mut l_map := map[int]bool
    mut r_map := map[int]bool

    l_map[0] = false
    l_map[1] = false

    r_map[0] = true
    r_map[1] = true

    l_map, r_map = r_map.move(), l_map.move()

    println(l_map)
    println(r_map)
}

Reproduction Steps

just compile the file

Expected Behavior

compilation error or support the feature

Current Behavior

/tmp/v_1000/bug.16467831999111614190.tmp.c:12656: warning: implicit declaration of function 'Map_int_bool_move'
/tmp/v_1000/bug.16467831999111614190.tmp.c:12656: error: cannot convert 'int' to 'struct map'
builder error:
...

Possible Solution

Handle coherently swapping of maps and document selected choice

Additional Information/Context

No response

V version

V 0.4.3 cd337e2

Environment details (OS name and version, etc.)

V full version: V 0.4.3 cd337e2
OS: linux, Linux Mint 21.2
Processor: 8 cpus, 64bit, little endian, Intel(R) Core(TM) i7-4770S CPU @ 3.10GHz

getwd: /home/gio/lelle/ex
vexe: /home/gio/lelle/v/v
vexe mtime: 2023-11-11 13:42:45

vroot: OK, value: /home/gio/lelle/v
VMODULES: OK, value: /home/gio/.vmodules
VTMP: OK, value: /tmp/v_1000

Git version: Error: sh: 1: git: not found

Git vroot status: Error: sh: 1: git: not found
.git/config present: false

CC version: cc (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0
thirdparty/tcc: N/A

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