Exporting module code vs declaring module pub

1

What's the difference between

// src/lib.rs
mod a {
    pub use self::b::Foo;
    mod b {
        pub trait Foo {
            fn foo(&self);
        }
    }
}

and

// src/lib.rs
mod a {
    pub mod b {
        pub trait Foo {
            fn foo(&self);
        }
    }
}

Is it simply a difference of being able to qualify as either a::Foo and a::b::Foo in lib.rs? In all cases, must trait Foo be pub (pub trait Foo)?

2

Yes and Yes.

1 Like
3

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