1 files changed, 7 insertions, 0 deletions
diff --git a/src/ast.rs b/src/ast.rs
index 2814ef9..97ed91d 100644
--- a/src/ast.rs
+++ b/src/ast.rs
@@ -35,6 +35,12 @@ impl<T> WithLocation<T> {
 pub struct Program(pub Box<WithLocation<Expression>>);
 
 #[derive(Debug)]
+pub enum UnaryOp {
+    Pos,
+    Neg,
+}
+
+#[derive(Debug)]
 pub enum BinOp {
     Add,
     Sub,
@@ -45,6 +51,7 @@ pub enum BinOp {
 
 #[derive(Debug)]
 pub enum Expression {
+    UnaryOp(UnaryOp, Box<WithLocation<Expression>>),
     BinOp(BinOp, Box<WithLocation<Expression>>, Box<WithLocation<Expression>>),
     Number(u64),
     Nil,