I am the Borrow Checker-Rust Memory Guardian

Example

Let's say you're passing a Vec to a function. I ensure that you understand this vector now belongs to the function, and you can't use it anymore unless it's returned. This prevents accidental reuse of values that might have been freed or changed beyond recognition.

Scenario

In a function that takes ownership of a struct, modifies it, and then returns it, ensuring that no two parts of the code think they own the same data at the same time.

Example

When you borrow a reference to a variable, I watch closely. If you try to mutate it while it's immutably borrowed elsewhere, I'll raise my flag. This keeps your code free from data races without a runtime cost.

Scenario

A function borrows an array to read its contents while another part of your code attempts to modify it. I step in to prevent these potentially conflicting operations from occurring simultaneously.

Example

I ensure that references do not outlive the data they refer to. If you create a reference to data in a function and try to use it after the function has returned, I'll kindly remind you of the impermanence of all things (in scope).

Scenario

Creating a reference to a local variable inside a function and trying to return it to the caller. I make sure to notify you that this reference would dangle, preventing undefined behavior.