1 files changed, 19 insertions, 0 deletions
diff --git a/src/ast.rs b/src/ast.rs
index 22d968e..7edf9c7 100644
--- a/src/ast.rs
+++ b/src/ast.rs
@@ -60,6 +60,7 @@ pub enum BinOp {
 
 #[derive(Debug)]
 pub enum Expression {
+    Let(Vec<WithLocation<VarDec>>, Box<WithLocation<Expression>>),
     UnaryOp(UnaryOp, Box<WithLocation<Expression>>),
     BinOp(BinOp, Box<WithLocation<Expression>>, Box<WithLocation<Expression>>),
     Number(u64),
@@ -67,3 +68,21 @@ pub enum Expression {
     Name(String),
     Nil,
 }
+
+#[derive(Debug)]
+pub struct VarDec {
+    name: WithLocation<String>,
+    type_: Option<String>,
+    value: Box<WithLocation<Expression>>,
+}
+
+impl VarDec {
+    pub fn new(name: WithLocation<String>, type_: Option<String>,
+               value: Box<WithLocation<Expression>>) -> VarDec {
+        VarDec {
+            name: name,
+            type_: type_,
+            value: value,
+        }
+    }
+}