👀 Views: 3 💬 Answers: 1 📅 Created: 2025-06-01

rust borrowing lifetimes structs Rust

I'm confused about I'm testing a new approach and I need help solving I'm working on a Rust application where I need to manage nested structs with lifetimes, but I'm running into some confusing borrow checker errors..... The project uses Rust 1.65.0 and involves a simple structure for a `User` that contains a `Profile`. The `Profile` struct has a reference to a string slice for the user's bio. When I try to create a method that returns a reference to the `Profile`'s bio, I get an behavior stating that the borrow checker want to guarantee the lifetime of the output reference. Here’s a simplified version of my code: ```rust struct Profile<'a> { bio: &'a str, } struct User<'a> { name: String, profile: Profile<'a>, } impl<'a> User<'a> { fn get_bio(&self) -> &'a str { self.profile.bio } } ``` When I attempt to compile this, I receive the following behavior: ``` behavior[E0106]: missing lifetime specifier --> src/main.rs:8:17 | 8 | fn get_bio(&self) -> &'a str { | ^ expected lifetime parameter ``` I've tried adjusting the lifetimes and even making the `Profile` struct own its `bio` instead, but that leads to further complications since I need the `bio` to be managed independently of the `Profile`. What am I missing here? Shouldn't the lifetimes align correctly since `User` holds a `Profile`? Any insights on how to resolve this would be appreciated. This is part of a larger application I'm building. How would you solve this? This is happening in both development and production on Windows 11. My development environment is Windows 11. Thanks in advance!