module main

struct JsonParser {
mut:
    js        string
    tokens    []string
    pos       int
    tok_next  int
    tok_super ?int
}

fn new_parser(qty int) JsonParser {
    return JsonParser{
        tokens: []string{cap: qty}
    }
}

fn (mut p JsonParser) parse() int {
    j := p.tok_super or { 999 }
    return j
}

fn test_main() {
    mut x := new_parser(100)
    i := x.parse()
    assert i == 999
}