implement foldl'

fix/src/lib.rs

@@ -636,7 +636,10 @@ enum Scope<'ctx, 'id, 'ir> {
         slot_id: u32,
     },
     Let(HashMap<StringId, GhostMaybeThunkRef<'id, 'ir>>),
-    Param { sym: StringId, abs_layer: u8 },
+    Param {
+        sym: StringId,
+        abs_layer: u8,
+    },
 }
 
 pub enum ExtraScope<'ctx> {