diff --git a/schala-lang/language/src/builtin.rs b/schala-lang/language/src/builtin.rs
index 075410f..7eea68f 100644
--- a/schala-lang/language/src/builtin.rs
+++ b/schala-lang/language/src/builtin.rs
@@ -4,6 +4,33 @@ use std::collections::HashMap;
 use crate::tokenizing::TokenKind;
 use crate::typechecking::{TypeConst, Type};
 
+#[derive(Debug)]
+enum Builtin {
+  Add,
+  Subtract,
+  Negate,
+  Multiply,
+  Divide,
+  Quotient,
+  Modulo,
+  Exponentiation,
+  BitwiseAnd,
+  BitwiseOr,
+  BooleanAnd,
+  BooleanOr,
+  BooleanNot,
+  Equality,
+  LessThan,
+  LessThanEquals,
+  GreaterThan,
+  GreaterThanEquals,
+  Comparison,
+  FieldAccess,
+  IOPrint,
+  IOPrintLn,
+  IOGetLine,
+}
+
 #[derive(Debug, PartialEq, Clone)]
 pub struct BinOp {
   sigil: Rc<String>