crates_blank_slate.rs

mod proteins {
    enum AminoAcid {
        Ala, Arg, Asn, Asp, Cys, Gln, Glu, Gly, His, Ile,
        Leu, Lys, Met, Phe, Pro, Ser, Thr, Trp, Tyr, Val
    }

    mod synthesis {
        // proteins/synthesis.rs
        pub fn synthesize(seq: &[AminoAcid])  // error: can't find type `AminoAcid`
        //~^ ERROR: cannot find type `AminoAcid` in this scope
            -> Protein
        {
            Protein
        }

        pub struct Protein;
    }
}