False positive of ``if` expression requires an expression as the last statement of every branch`

[xliiv]

Describe the bug

Nested if wrongly expects expression value.

Reproduction Steps

Run code below

fn some_fn(text string) {
    mut some_map := map[string]string
    dump(some_map)

    key := ''
    found := some_map[key] or {
        key2 := ''

        // THIS WORKS
        // if key2 in some_map {
        //     _ := if some_map[key2] == key {
        //         0
        //     } else {
        //         panic('err')
        //     }
        // } else {
        //     some_map[key2] = key
        //     0
        // }

        // WHILE THIS IS BROKEN
        if key2 in some_map {
            if some_map[key2] == key {
            } else {
                panic('err')
            }
        } else {
            some_map[key2] = key
        }

        key2
    }
    dump(found)
}

fn main() {
    some_fn('abc abc')
}

Expected Behavior

code compiles and runs

Current Behavior

x.v:23:4: error: `if` expression requires an expression as the last statement of every branch
   21 |         // WHILE THIS IS BROKEN
   22 |         if key2 in some_map {
   23 |             if some_map[key2] == key {
      |             ~~~~~~~~~~~~~~~~~~~~~~~~
   24 |             } else {
   25 |                 panic('err')
x.v:23:4: error: the final expression in `if` or `match`, must have a value of a non-void type
   21 |         // WHILE THIS IS BROKEN
   22 |         if key2 in some_map {
   23 |             if some_map[key2] == key {
      |             ~~
   24 |             } else {
   25 |                 panic('err')
x.v:28:19: error: `if` expression requires an expression as the last statement of every branch
   26 |             }
   27 |         } else {
   28 |             some_map[key2] = key
      |                            ^
   29 |         }
   30 |

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.11

Environment details (OS name and version, etc.)

|V full version |V 0.4.11 487feb9
|V last modified time|2025-09-01 17:45:42

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