```python
x = """Lambda,
If,
Set,
Define,
Cond,
Case,
And,
Or,
When,
Unless,
Begin,"""
x = x.replace(" ", "").replace(",", "").replace("\r", "")
x = x.splitlines()
print("// ===== Begin Special Forms =====")
for i in x:
i = i.lower()
print(f"fn sf_{i}<'a>(&mut self, tree: &[Ast<'a>]) -> Option<Hir<'a>> {{")
print("todo!()")
print("}")
print("// ===== End Special Forms =====")
```