Crate key_paths_core 

Lightweight, dependency-free keypath traits for Rust.

Implement Readable and Writable on your keypath types so callers can navigate roots uniformly. Use KpTrait for TypeId helpers and KpTrait::then composition.

Higher-level crates (for example rust-key-paths) add concrete keypath structs, chaining, and lock/async adapters on top of these traits.

Traits

AccessorTrait

Optional-root and fallback helpers built on Readable / Writable.

KeyPath

A keypath that supports both read and write navigation.

KeyPathValueTarget

Used so async chaining can infer the referent of a reference-valued step (e.g. &T and &mut T both map to T).

KpTrait

Logical root/value type identity and composition for a keypath.

Readable

Read-only keypath: navigate from Root to Value.

Writable

Mutable keypath: setter path (same semantics as a get_mut closure on many keypath APIs).