Finicky local environment handling

[wiseodd]

Something is not right around here:

rustlox/src/interpreter.rs

Lines 159 to 184 in f7a1899

	Stmt::Block { statements } => self.execute_block(
	statements,
	Rc::new(RefCell::new(Environment::new(Some(
	self.environment.clone(),
	)))),
	),
	_ => unreachable!(),
	}
	}
	pub fn execute_block(
	&mut self,
	statements: &Vec<Option<Box<Stmt>>>,
	environment: Rc<RefCell<Environment>>,
	) -> Result<(), LoxError> {
	let previous = self.environment.clone();
	self.environment = environment.clone();
	for stmt in statements.to_owned().iter().flatten() {
	self.execute(stmt)?;
	}
	self.environment = previous;
	Ok(())
	}