{"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"//"}]}
    // added to `used_items` in a hash set, which can efficiently query in the
    // mentioned item. So instead we collect all pre-monomorphized `MentionedItem` that were already
    // `body.mentioned_items` loop below without even having to monomorphize the item.