Created IFn protocol

Author: Tko1

src/protocols/ifn.rs

@@ -0,0 +1,17 @@
+use crate::value::{Value,ToValue};
+use std::rc::Rc;
+use crate::ifn;
+
+// Let's keep it simple for now, but we will expand this 
+define_protocol!(IFn,IFn);
+
+impl ifn::IFn for IFn {
+    fn invoke(&self, args: Vec<Rc<Value>>) -> Value {
+        match &*self.value {
+            Value::IFn(ifn) => {
+                ifn.invoke(args)
+            },
+            _ => panic!("Called Iterable iter on non-iterable"),
+        }
+    }
+}