add closure size variable

compiler/can/src/builtins.rs

@@ -1590,13 +1590,15 @@ fn defn(
         .map(|(var, symbol)| (var, no_region(Identifier(symbol))))
         .collect();
 
-    let expr = Closure(
-        var_store.fresh(),
-        fn_name,
-        Recursive::NotRecursive,
-        closure_args,
-        Box::new((no_region(body), ret_var)),
-    );
+    let expr = Closure {
+        function_type: var_store.fresh(),
+        closure_type: var_store.fresh(),
+        return_type: ret_var,
+        name: fn_name,
+        recursive: Recursive::NotRecursive,
+        arguments: closure_args,
+        loc_body: Box::new(no_region(body)),
+    };
 
     Def {
         loc_pattern: Located {