Lib.rs

In Rust pub fn new() is used as a constructor. Use the Self type alias to avoid typing the full type name three times:

impl LongComplexTypeName<Annoying> {
    pub fn new() -> Self {
        Self {
        }
    }
}

Note that Self (uppercase S) is a type name, as opposed to self variable shorthand used in methods.

Try it: Rust Playground