Rust failing generated fib_with_argparse.rs
```rs
   Compiling fib_with_argparse v0.1.0 (/Users/jayvdb/Library/Caches/cargo-eval/scripts/file-fib_with_argparse-264061241e573ab9)
error: field is never read: `v`
  --> fib_with_argparse.rs:35:5
   |
35 |     pub v: bool,
   |     ^^^^^^^^^^^
   |
   = note: `-D dead-code` implied by `-D warnings`

error: could not compile `fib_with_argparse` due to previous error
```