Phase 2: Type System

Status: Mostly Complete

Phase 2 main features are implemented, but some tasks remain incomplete.

Overview

• Objective: Implementation of robust type inference system and null safety analysis
• Key Deliverables: Type inference engine, null safety analysis, pattern matching, generics handling
• Implementation Period: Oct 1, 2025 - Oct 8, 2025 (~1 week)

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Key Features

Type Inference Engine

• ✅ Hindley-Milner type inference foundation
• ✅ Local type inference
• ✅ Advanced type inference features
• ✅ Error handling and diagnostics

Null Safety Analysis

• ✅ Null safety type system design
• ✅ Flow type analysis
• ✅ Null safety verification
• ✅ Java interop null safety
• ✅ Java annotation processing (passthrough)

Incomplete Tasks

Requires Attention

• ⬜ Extend is syntax parsing in when patterns
• ⬜ Implement advanced TypeAnnotation analysis
• ⬜ Set up null safety integration test regression prevention

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Roadmap Documentation

This document is based on the development checklist.