Phase 256.8.5: Eliminate duplication of entry function extraction logic
across Pattern2/4/6/7.
Changes:
- Add patterns/common/joinir_helpers.rs with get_entry_function() helper
- Refactor 4 files to use shared helper (eliminate ~40 lines of duplication)
- Consistent error messages across all patterns
Benefits:
- DRY principle: Single source of truth for entry function extraction
- Maintainability: Future changes only need to happen once
- Consistency: All patterns use identical logic and error messages
- Testability: Can be tested independently
Files refactored:
- pattern2_steps/emit_joinir_step_box.rs
- pattern4_with_continue.rs
- pattern6_scan_with_init.rs
- pattern7_split_scan.rs
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
tomoaki
636b1406bc