Explain Cairo deref coercion with Deref/DerefMut traits and Target associated type; use when a request involves wrapper types, field access through wrappers, or deref behavior in Cairo.
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---
name: cairo-deref-coercion
description: Explain Cairo deref coercion with Deref/DerefMut traits and Target associated type; use when a request involves wrapper types, field access through wrappers, or deref behavior in Cairo.
---
# Cairo Deref Coercion
## Overview
Guide how deref coercion works via `Deref` and `DerefMut`, and when it applies.
## Quick Use
- Read `references/deref-coercion.md` before answering.
- Show the `Deref` trait and a wrapper example.
- Note that `DerefMut` only applies to mutable variables.
## Response Checklist
- Implement `Deref<T>` with `type Target` and `fn deref(self: T) -> Target`.
- Use deref coercion to access fields on the wrapped type.
- Use `DerefMut` when you need mutable-only coercion; it does not make the target mutable by itself.
## Example Requests
- "Why can I access fields on a wrapper type?"
- "How do I implement Deref for a custom type?"
- "Why does DerefMut require a mut variable?"
