Some basic parsing, with interned strings.

src/syntax/ast.rs

@@ -1,12 +1,19 @@
-pub enum Stmt {
-    Binding(String, Expr),
-    Expr(Expr),
+use crate::syntax::token_stream::Location;
+
+pub struct Program {
+   pub statements: Vec<Statement>,
+   pub result: Expression, 
 }
 
-pub enum Expr {
-    Value(Value),
-    Reference(String),
-    Primitive(String, Vec<Expr>),
+pub enum Statement {
+    Binding(Location, String, Expression),
+    Expr(Location, Expression),
+}
+
+pub enum Expression {
+    Value(Location, Value),
+    Reference(Location, String),
+    Primitive(Location, String, Vec<Expression>),
 }
 
 pub enum Value {