# Status: Perl 5.43.4 Empty If/Else Block Optimization Fix

## Current Phase
Phase 5: Complete

## Completed
- [x] Investigated test_output/cover/padrange2.5.043004 changes
- [x] Confirmed change stems from Perl PR #23367
- [x] Analyzed optree differences between Perl 5.42 and 5.43.4
- [x] Identified root cause in Devel::Cover condition logic
- [x] Implemented fix in lib/Devel/Cover.pm
- [x] Updated expected test output file
- [x] Verified all 84 tests pass
- [x] Analyzed test coverage gaps
- [x] Created new test `empty_else` covering both code paths
- [x] Generated expected output file
- [x] Verified all 85 tests pass

## Test Coverage Analysis

The fix has two code paths - now both covered:
| Case | Condition | Test Coverage |
|------|-----------|---------------|
| 1 | `B::class($false) eq "NULL"` - sub with empty else | Covered by `tests/empty_else` |
| 2 | `$false->name eq "null"` - main with empty else | Covered by `tests/empty_else` and `padrange2` |
| 3 | Original is_scope path (both branches have code) | Covered by `tests/if` |

## Files Changed
1. `lib/Devel/Cover.pm` - Lines 1080-1089: Added checks for optimized empty branches
2. `test_output/cover/padrange2.5.043004` - Updated expected branch output format
3. `tests/empty_else` - New test file for empty else blocks
4. `test_output/cover/empty_else.5.042000` - Expected output for new test

## Metrics
- All 85 tests passing
- Fix verified on both Perl 5.42 and 5.43.4
