{"ast_node_type":"other","tokens":[{"end":94,"kind":"keyword","start":0,"text":"//"}]}
    // scan and not very efficient. Furthermore we can only do that *after* monomorphizing the
    // they are already added in `used_items`. We could just scan `used_items`, but that's a linear
    // mentioned item. So instead we collect all pre-monomorphized `MentionedItem` that were already