1. 1. Introduction
2. 2. Concepts
3. 3. Basics
4. 4. Core Effects
5. 5. Effect Requirements
6. 1. 5.1. Applying Requirements
   2. 5.2. Shuffling Requirements
   3. 5.3. Providing Requirements
   4. 5.4. Context Requirements
7. 6. Handlers
8. 1. 6.1. Reader/Writer
   2. 6.2. Abort
   3. 6.3. State Effects and Lenses
   4. 6.4. First-Class Environments and Context Structs
   5. 6.5. Dependency Injection and Programmable Typeclasses
   6. 6.6. Direct-Style and Builder APIs
   7. 6.7. Macro-Based Ergonomics
   8. 6.8. Advanced Handler Composition
   9. 6.9. Effect Polymorphism and Generic Abstractions
   10. 6.10. Structured Concurrency
   11. 6.11. Performance and Trade-offs
   12. 6.12. Resource Management and Bracket Patterns
   13. 6.13. Testing Effectful Code
9. 7. What Makes fx-rs Interesting
10. 8. Future Work & Research Directions