SUCCESS

Rust Pattern Match Preprocessor fully implemented and tested.

Files Created: 4
- pkg/preprocessor/rust_match.go (379 lines)
- pkg/preprocessor/rust_match_test.go (338 lines)
- tests/golden/pattern_match_01_simple.dingo (67 lines)
- tests/golden/pattern_match_01_simple.go.golden (114 lines)

Files Modified: 1
- pkg/preprocessor/preprocessor.go (added RustMatchProcessor to pipeline)

Tests: 12/12 passing (100%)
- Simple Result<T,E> pattern match
- Simple Option<T> pattern match
- Wildcard pattern handling
- Multiple matches (counter increment)
- Non-match code pass-through
- Multiline/block expressions
- Complex scrutinee expressions
- Pattern parsing (3 subtests)
- Tag name mapping (6 subtests)
- Binding extraction (4 subtests)

Features Implemented:
✅ Rust-like match syntax parsing
✅ Pattern arm extraction (with bindings)
✅ Block expression support (nested braces)
✅ Wildcard pattern (_)
✅ DINGO_MATCH markers for plugin integration
✅ Source mapping generation
✅ Integration with preprocessor pipeline
✅ Zero import dependencies

Ready for Integration:
✅ PatternMatchPlugin (Task D) can consume markers
✅ Config system (Task A) can control syntax choice
✅ Golden test examples created and documented

Next Steps:
- Task D: Implement PatternMatchPlugin for exhaustiveness checking
- Task E: Enable golden test (remove from skip list)
