Rust

6.8    Solutions

This section provides the code solutions for the practice exercises in Section 6.7. The code is largely self-explanatory; however, we have included comments and additional explanations wherever necessary to enhance understanding.

1. Fixing visibility issues in nested modules

   mod m1 {    struct A {        d: m2::D,    }    mod m2 {        pub enum D {    // Child module items are not visible to the                         // parent module            B,            C,        }    }}fn main(){}  

2. Resolving module visibility and path issues

   mod m1 {    struct A {        d: m2::D,    }    pub mod m2 {    /* Public items of a private child module, are only accessible by the        parent. We need to make the child module m2 pub, so that its public        items can be used outside the parent module.*/        pub enum D {            B,            C,        }    }}mod m3 {    struct