function arguments are getting added to the AST!

tests/test.pla

@@ -1,8 +1,7 @@
-test = Func(): Int {
-	x: Int = 3;
-	return x + 2;
+add = Func(a: Int, b: Int): Int {
+	return a + b;
 }
 
 main = Func(): Int {
-	return test();
+	return add(2, 3);
 }