[checkpoint] Start the switch to type inference.

src/ir/strings.rs

@@ -21,12 +21,12 @@ impl Program {
 impl Statement {
     fn register_strings(&self, string_set: &mut HashSet<ArcIntern<String>>) {
         match self {
-            Statement::Binding(_, name, expr) => {
+            Statement::Binding(_, name, _, expr) => {
                 string_set.insert(name.clone());
                 expr.register_strings(string_set);
             }
 
-            Statement::Print(_, name) => {
+            Statement::Print(_, _, name) => {
                 string_set.insert(name.clone());
             }
         }