# Code Review Issues

## Summary
No blocking issues found. All acceptance criteria met. 14 comprehensive unit tests added covering construction, equality, clone, and nesting scenarios for function AST nodes.

## SHOULD_FIX Issues

### 1. Missing test coverage for unimplemented function compilation
- **Location**: `src/compiler.rs` lines 73-75, 117-119
- **Severity**: should_fix
- **Description**: The compiler has `unimplemented!()` placeholders for FunctionDef, Return statements, and Call expressions, but there are no tests verifying the behavior when attempting to compile these nodes.
- **Impact**: Without tests, future developers may not realize these features are unimplemented and the expected behavior is unclear.
- **Recommendation**: Add tests that attempt to compile programs containing these nodes and verify they panic with the expected message "not yet implemented".

Example test case:
```rust
#[test]
#[should_panic(expected = "not yet implemented")]
fn test_compile_function_def_unimplemented() {
    let program = Program {
        statements: vec![Statement::FunctionDef {
            name: "foo".to_string(),
            params: vec![],
            body: vec![],
        }],
    };
    compile(&program).unwrap();
}
```

## Notes
- All 6 acceptance criteria are met
- AST structure is correct and well-designed
- 14 new unit tests exceed the requirement of 10
- Tests cover construction, equality, clone, and complex nesting scenarios
- No security issues, crashes, data loss, or logic errors found
- Compiler placeholders are appropriate for this phase
