- Add TestAllExpressionTypes covering all expression nodes
- Add TestAllStatementTypes covering all statement nodes
- Add TestAllTypeExpressions covering all type expressions
- Add TestControlFlowPatterns demonstrating complex control flow
- Fix formatter for field initializers, type spacing, and labels
- Fix handling of orelse blocks, switch payloads, and errdefer
- Remove duplicate test functions from previous edits
- Tests serve as documentation/examples for AST construction
- Add support for error sets and error union types
- Implement for loops with index and payload syntax
- Add defer, break, continue, and switch statements
- Support unary expressions and array indexing
- Add unreachable expression and test declarations
- Extend AST with new type expressions (array, error union)
- Update formatter to handle all new syntax elements
- Fix formatting for switch prongs, payloads, and blocks
