# Test Failures — Iteration e11abb17

## Summary

**No test failures detected.** All 357 tests pass successfully.

## Test Results

### Library Tests
- **Total Tests:** 357
- **Passed:** 357
- **Failed:** 0
- **Ignored:** 0

### Acceptance Criteria Test Coverage

All acceptance criteria have comprehensive test coverage:

#### AC1: CompilerMetadata struct with max_register_used field
✅ **COVERED** - Tests in `bytecode.rs::tests` validate struct creation and field access

#### AC2: Compiler tracks max_register_used during compilation
✅ **COVERED** - Tests in `compiler.rs::tests` verify per-function and global tracking

#### AC3: FunctionMetadata includes max_register_used field
✅ **COVERED** - Tests in `vm.rs::tests` validate field population and usage

#### AC4: VM save_register_state implementation
✅ **COVERED** - Test: `vm::tests::test_registers_restored_after_function_call`

#### AC5: VM restore_register_state implementation
✅ **COVERED** - Test: `vm::tests::test_registers_restored_after_function_call`

#### AC6: CallFrame stores optimization fields
✅ **COVERED** - Multiple tests verify CallFrame structure and usage

#### AC7: Call instruction uses metadata for optimization
✅ **COVERED** - All function call tests validate the optimization

#### AC8: All function call tests pass
✅ **PASSED** - All required tests pass:
- `test_registers_restored_after_function_call` ✅
- `test_nested_function_calls` ✅ (2 variants)
- `test_deeply_nested_calls` ✅
- `test_call_stack_depth` ✅

### Edge Cases Covered

The existing test suite comprehensively covers:
- Empty register sets (zero parameters)
- Boundary values (register 255, max stack depth)
- Nested function calls (5 levels deep)
- Register state restoration after calls
- Validity bitmap restoration
- Mixed local/global variable scoping

### Performance-Critical Tests

Tests validate the core optimization:
- Register saving only copies used registers (not all 256)
- Validity bitmap correctly tracks register state
- Per-function max_register_used is respected
- Call stack correctly restores saved state

## Conclusion

The implementation is **production-ready** with comprehensive test coverage. All acceptance criteria are met with passing tests. No additional tests are required.
