(module
  (func $fib (export "fib") (param $n i32) (result i32)
    local.get $n
    i32.const 2
    i32.lt_s
    if
      i32.const 1
      return
    end
    local.get $n
    i32.const 2
    i32.sub
    call $fib
    local.get $n
    i32.const 1
    i32.sub
    call $fib
    i32.add
    return
  )
)