# Feedback: bytecode-extensions-functions

## Status: ✅ APPROVED

All acceptance criteria have been successfully met. The implementation is complete and correct.

### Summary

The implementation adds comprehensive support for function operations in the bytecode system:

**Instruction Variants** ✅
- `Instruction::DefineFunction` with name_index, param_count, body_start, body_len
- `Instruction::Call` with name_index, arg_count, dest_reg
- `Instruction::Return` with has_value, src_reg

**Builder Methods** ✅
- `emit_define_function(name, param_count, body_start, body_len)` — Adds DefineFunction instruction with automatic name pooling
- `emit_call(name, arg_count, dest_reg)` — Adds Call instruction with automatic name pooling
- `emit_return(has_value, src_reg)` — Adds Return instruction

**Name Deduplication** ✅
- Function names are correctly deduplicated in the existing `var_names` pool (shared with variable names)
- Verified by tests: `test_function_name_deduplication`, `test_function_and_variable_names_share_pool`

**Test Coverage** ✅
- **14 new tests** exceed the minimum requirement of 10
- All tests pass (240 total: 199 existing + 41 new from this and prior iteration)
- Comprehensive coverage:
  - Instruction creation and builder methods (4 tests)
  - Name deduplication (2 tests)
  - Edge cases: 0 params, 255 params, 0 args, 255 args, empty body (5 tests)
  - Complex scenarios: function definition+call+return flow, nested functions, shared pool behavior (3 tests)

**Regression Check** ✅
- All 199 existing bytecode tests continue to pass (no regressions)

### Acceptance Criteria Verification

| Criterion | Status | Evidence |
|-----------|--------|----------|
| AC2.8 (partial): Function call support | ✅ | DefineFunction, Call, Return instructions enable bytecode-level function operations |
| Instruction::DefineFunction variant | ✅ | Implemented with all required fields (name_index, param_count, body_start, body_len) |
| Instruction::Call variant | ✅ | Implemented with all required fields (name_index, arg_count, dest_reg) |
| Instruction::Return variant | ✅ | Implemented with all required fields (has_value, src_reg) |
| emit_define_function() method | ✅ | Implemented, integrates with var_names pool for deduplication |
| emit_call() method | ✅ | Implemented, integrates with var_names pool for deduplication |
| emit_return() method | ✅ | Implemented with correct signature |
| Function name deduplication | ✅ | Verified through tests—uses add_var_name() for automatic deduplication |
| Existing tests pass | ✅ | All 199 existing tests pass (regression check) |
| 10+ new tests | ✅ | 14 new tests implemented with excellent coverage |

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**No action required.** Issue is ready to merge.
