diff --git a/schala-lang/language/src/visitor.rs b/schala-lang/language/src/visitor.rs
index 73453ed..bd077d8 100644
--- a/schala-lang/language/src/visitor.rs
+++ b/schala-lang/language/src/visitor.rs
@@ -1,33 +1,41 @@
 use std::rc::Rc;
 
 use crate::builtin::{BinOp, PrefixOp};
-use crate::ast::{Expression, ExpressionKind};
+use crate::ast::{Expression, ExpressionKind, InvocationArgument, Meta};
 
 pub trait ExpressionKindVisitor<T> {
   fn nat_literal(&mut self, n: &u64) -> T;
+  fn float_literal(&mut self, f: &f64) -> T;
   fn string_literal(&mut self, s: Rc<String>) -> T;
+  fn bool_literal(&mut self, b: &bool) -> T;
   fn binexp(&mut self, op: &BinOp, lhs: &Expression, rhs: &Expression) -> T;
+  fn prefix_exp(&mut self, op: &PrefixOp, arg: &Expression) -> T;
+  fn value(&mut self, value_name: Rc<String>) -> T;
+  fn call_expression(&mut self, f: &Expression, arguments: &Vec<Meta<InvocationArgument>>) -> T;
 }
 
 pub fn dispatch<T>(input: &ExpressionKind, visitor: &mut dyn ExpressionKindVisitor<T>) -> T {
   use ExpressionKind::*;
   match input {
     NatLiteral(n) => visitor.nat_literal(n),
+    FloatLiteral(f) => visitor.float_literal(f),
     StringLiteral(s) => visitor.string_literal(s.clone()),
+    BoolLiteral(b) => visitor.bool_literal(b),
     BinExp(op, box lhs, box rhs) => visitor.binexp(op, lhs.node(), rhs.node()),
+    PrefixExp(op, box arg) => visitor.prefix_exp(op, arg.node()),
+    Value(val_name) => visitor.value(val_name.clone()),
+    Call { box f, arguments } =>  visitor.call_expression(f.node(), arguments),
     _ => panic!()
   }
 }
 
+/*
 struct NumberSummer;
 
 impl ExpressionKindVisitor<u64> for NumberSummer {
-  fn nat_literal(&mut self, n: &u64) -> u64 {
-    n.clone()
-  }
-  fn string_literal(&mut self, s: Rc<String>) -> u64 {
-    0
-  }
+  fn nat_literal(&mut self, n: &u64) -> u64 { n.clone() }
+  fn float_literal(&mut self, f: &f64) -> u64
+  fn string_literal(&mut self, s: Rc<String>) -> u64 { 0 }
   fn binexp(&mut self, op: &BinOp, lhs: &Expression, rhs: &Expression)  -> u64 {
     let lhs = dispatch(&lhs.kind, self);
     let rhs = dispatch(&rhs.kind, self);
@@ -46,3 +54,4 @@ fn yolo_swagg() {
   let result = dispatch(&x, &mut t);
   assert_eq!(result, 4);
 }
+*/