Extraneous warnings about dead code

[nrc]

Non-pub functions (e.g., main) in the final crate. Due to rust-lang/rust#38273.

[nrc]

We could also fix this by running with -Zno-trans rather than --crate-type=metadata, however, only the latter is stable.

[nrc]

Fixed by rust-lang/rust#38571 and a soon to be appearing Cargo PR

[sophiajt]

@nrc - is this fixed now?

[nrc]

Yes!