Refactor function signatures to use slices

src/ast/rtl/math.rs

@@ -168,7 +168,7 @@ pub fn register(env: &Environment) {
             let prng = std::rc::Rc::new(std::cell::RefCell::new(rng));
 
             Value::Function(std::rc::Rc::new(crate::ast::types::NativeFunction {
-                func: std::rc::Rc::new(move |_| Value::Float(prng.borrow_mut().f64())),
+                func: std::rc::Rc::new(move |_args| Value::Float(prng.borrow_mut().f64())),
                 purity: Purity::Impure,
             }))
         },