// StringBox plugin concat demo
// Build plugin: (cd plugins/nyash-string-plugin && cargo build --release)

static box Main {
  main() {
    local s, t
    s = new StringBox()
    // concat with literal
    t = s.concat("hello")
    // concat again (handle)
    t = t.concat(" world")
    // return length of resulting string
    return t.length()
  }
}