{"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":".get_optional_fn(bx,"}]}
                        .get_optional_fn(bx, vtable, ty, fn_abi),
                    meth::VirtualIndex::from_index(ty::COMMON_VTABLE_ENTRIES_DROPINPLACE)
                    fn_abi,