{"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"//"}]}
                    // add will be the first visible, even if it isn't the actual first generic.
                    // an inferred lifetime, in which case the generic we're suggesting to
                    (arg_span.shrink_to_hi(), arg_span.hi() <= gen_args_span.lo())