1. Introduction
3. User Guide
4. 1. First Steps
5. 1. 1.1. Installation
   2. 1.2. Core Concepts
   3. 1. 1.2.1. Registry
      2. 1.2.2. Lifetimes
      3. 1.2.3. Registration
      4. 1.2.4. Retrieval
7. Reference Guide
8. 2. Registry
9. 3. Derive Macro
10. 4. Feature Flags