struct Struc {
    a string
    b int
    c ?string
    d ?int
}

pub struct Count {
mut:
    total int
}

// count_chars count json sizen without new encode
pub fn (mut count Count) count_chars[T](val T) {
    $if val is $option {
        workaround := val
        if workaround != none {
            count.count_chars(val)
        }
    } $else $if T is $struct {
        count.chars_in_struct(val)
    } $else {
    }
}

// chars_in_struct
fn (mut count Count) chars_in_struct[T](val T) {
    $for field in T.fields {
        va := val.$(field.name)
        count.count_chars(va) // works
        count.count_chars(val.$(field.name)) // Not works
    }
}

fn test_main() {
    struc := Struc{}
    mut count := Count{}
    count.count_chars(struc)
    assert true
}